Fiero iac reset. Just replace coil cap and rotor.
Started on: 02-28-2016 07:01 PM: Replies: 7 (315 views) Last post by Feb 6, 2006 · Hi every one , I am new to the site, I just got a 88 GT Fiero V6 all stock with a 5 speed, my problem is my idle :>( , , when I take my foot off the gas it goes down to 1100 and slowly works it’s way to 1000-900 ( and I don’t even now if that’s ok, ). As the engine begins to warm up and idle drops down to 900, idle begin to get rough and the engine starts shaking and vibrating a lot more, you can feel the whole car vibrating even in the steering wheel, it is almost like it's missing. Unplug the electrical connector for the IAC. The set screw in the throttle body is for minimum air flow through the Pennock's Fiero Forum Technical Discussion & Questions IAC Question IAC Question by jaydaug2008. Engine on. So I did the inspection with the vacuum lines under the plenum with a "den Feb 19, 2009 · the engine is properly tuned, you can go through the IAC system. ] May 2, 2011 · The ECM controls the position of the IAC. 8 V6). Code 42: Electronic Spark Timing Mar 15, 2007 · I was setting the idle and when followed the process I was still getting air thru the IAC TB opening. This will now reset the IAC to a known key-off "park" position. Mar 23, 2016 · On a 3. ) Idle RPM also depends on Transmission Type and in case of AT "in gear" or not. Reset the ecm and started trying to drive the car around to let it relearn everything but it was back to having little power and wanting to dye with low rpm every time i slowed down. So I just disconnected everything and opened the TB and connected the IAC alone. [This message has been edited by netpro55 (edited 06-19-2005). The GM service manual states the following: - Turn ignition to "on" - Check TPS voltage, adjust to . After I put in the new one it jumped to 2500 rpm . I was having the engine cut off issues prior to changing my alternator. I pulled the IAC and wrapped a rag around it then turned the ignition on with A and B jumped. Canister to inlet and canister to TB pipe. ] Did you reset the IAC motor when you installed it. It runs great except has a surging/hunting idle. I need to unplug it and jump A and B on the ALDL so that it can reset my idle or something like that. Mar 23, 2013 · It closed the Idle Air Control all the way. Reconnect negative battery cable Jan 11, 2012 · so kindof stumped, i really doubt the iac valve needs "reset" as it wassnt messed with next step im thinking is to pull the TB and clean and all that good stuff, but just wanted some other suggestions before doing that, as i may overlooked or missed something Thanks [This message has been edited by Klynt87Fiero (edited 12-10-2010). 5 Duke. With the IAC installed I disconnected the rubber inlet and blocked the IAC inlet in the manifold. May 2, 2011 · Often the iac can be made to perform better by just spraying the area with carb or injector cleaner,better to pull it out and clean the inner area with a cleaner and spray the unit good it is easily removed ,, when cleaning the area where the IAC plugs into use a soft Q tip ,, The tip of the IAC is called a pintle check it to see if it is pitted severely ,even with pitting they normally will Aug 11, 2006 · No, leave the pintle where it is and install the IAC solenoid. b. ] D16 Fuel Injectors 2-4-6 (Gnd Switch) CTS Coolant Temperature Sensor EST Electronic Spark Timing EVRV Electronic Vacuum Regulator Valve GSS Gear Selector Switch IAC Idle Air Control Valve MAP Manifold Absolute Pressure Sensor MAT Manifold Air Temperature Sensor OS Oxygen Sensor TPS Throttle Position Sensor VSS Vehicle Speed Sensor Oct 15, 2004 · Last week my cat converter clogged up. You need to charge or replace a "Dead" battery before starting. ------------------ Notchbacks Rule 84 Coupe(parts car) 85GT(show car) 87SE Gold(project car) 87SE Silver(daily driver) RockAuto ships auto parts and body parts from over 300 manufacturers to customers' doors worldwide, all at warehouse prices. So this is what I did and maybe you can help me diagnose from here. May 2, 2011 · Pennock's Fiero Forum Technical Discussion & Questions - Archive I. Any way to check to see if these things are working before spending the dough on a new one?What exactly does this valve do anyway? The car does seem to miss every now and then. Often the IAC is attached to the engine throttle and its purpose is to regulate the airflow in the engine, helping to create smoother idling. Just replace coil cap and rotor. I have been having problems when I put the car in neutral getting ready to stop my rpms drop down to 500 and bounce back up and sometimes it just stops the engine. Forever-Fiero Okay, so I sprayed some throttle body cleaner into the TB. Jun 4, 2000 · Does anyone know what the cold idle speed should be for a 1984 4 cyl std shift fiero? I don't think I have a vacuum leak. Plugs and wires are less than 2 years old. I know I have to reset the ECM. check engine was on. Dec 6, 2000 · I replaced the Iac today since getting a code 35. Free Same Day Store Pickup. "Weird" can be a wide range of symptoms from stalling to bad fuel economy. The previous owner was a hack. To make a long story short I reset the throttle body set screw and I think after sitting for a few minutes I am still getting a code 35. When the vehicle speed sensor (VSS) tells the ECM that the car has reached 40-45 MPH, the ECM will extend the pintle and reset the microprocessor. I am in the process of swapping the powertrain to a 3800 s/c with a 5mt, but in the meantime, I’m using it as a daily driver to keep the miles off of my Subaru. The pin did not move at all. After replacing all of the fol Hopefully it stays this way. Th It seems like the IAC reset after the higher MPH, but still isn't quite right. Start the engine and record the IAC steps, engine coolant and air temp, commanded ignition timing, and BLM value after 1 minute of running. 8L v6 was idling at 1500 now with the new idle control its at 2000, grrr someone give me a clue to how to remedy this problem. Good luck on your search. Normally people just drive the car over 35 mph and it will auto reset. 8 4spd, I have the IAC unplugged and manually adjusted to anywhere from a 900-1100 rpm idle by moving the IAC pintle in and out by hand. ? Is it safe to check ecm output at IAC connector with test light? In Apr 21, 2010 · I got a 210* / 200* fan switch from Rodney and since I've been driving my V6 fiero I noticed from the start my RPM is 1200 at idle. com/subscription_center?add_user=COMPCamsFAS Scan this QR code to download the app now. Any ideas as to what i should check next? Its on my 86GT 4speed. 4 pr with a fiero top end I keep getting iac even though I replaced it. Some also can "reset" when parked & push gas pedal > 2000-2500RPM for a few seconds like 87+ Dukes "Resetting" IAC just means ECM close it completely so can count IAC Steps. I replaced the intake ducting. Yes there is a learn/reset that occurs at over 40 mph. Sep 9, 2019 · IAC will "reset" "relearn" itself ever time the car is driven over ~ 35mph in all Fiero and others w/ old GM OBD1 ECMs. Now that the air leak is gone, it's not getting enough air to idle. Mar 23, 2016 · I am working changing out an IAC for 84 2M4. ) >Just hand tight! 4. Once the IAC valve relearn procedure has been relocated, detach it and cut any wiring. 45mv for years, usually out of adjustment from some knucklhead removing the plug that blocks adjustability of the throttle blade angle because his or her engine "wouldnt idle right", not bothering to pull out the IAC valve and clean the pintle and the bore and reset the IAC counts and pintle RockAuto ships auto parts and body parts from over 300 manufacturers to customers' doors worldwide, all at warehouse prices. Thanks in advance, Mar 14, 2013 · Just got myself a 2. Scott P. The measurement should be made from the valve housing to the end of the pintle cone. A. I stored it for winter with the positive battery disconnected. Turn the engine on and while cranking, press the acceleration pedal similar to how much you would be going at 40 mph and keep it there for 5 to 6 seconds, this should rev the engine to 2500/3000 rpm. Some will reset IAC when you hold the gas above ~2000RPM for 30sec to 1 minute but many ignore you. 8 I'm having some general running issues and suspect the IAC but am on a strict budget for now so don't want to just replace to be sure. The idle air control – or IAC – valve is an important component in a car’s engine. Remove the Idle Air Control Valve (IAC) electrical connector. Jun 11, 2023 · You should reset computer after replacing the IAC. Post Reply Email This Page to Someone! 86 Fiero GT 4spd - (pending L67 swap) 98 GTP - Some mods Mar 15, 2007 · the engine is properly tuned, you can go through the IAC system. Feb 23, 2004 · In your case, I'd check for a cracked intake manifold and also a bad or sticking IAC motor. Unhooked the connector 4. This is I have already cleaned/reset my IAC, verified that my TPS was reading accurately, cleaned out my throttle body (I didn't really think this would help this specific problem, but I'm mentioning it just in case) and replaced my IAT sensor. Started the engine with the IAC unplugged, I noticed the exhaust manifolds no longer glowed and the idle was actually smoother. adjust pintle length to 1 1/8" -measured from mounting surface of IAC casing to tip of pintle 5. [This message has been edited by zobari (edited 12-09-2019). Feb 6, 2006 · my 2. GM etc Books said 700 TBI does reset IAC w/o driving when ECM see throttle over ~2000rpm for xx seconds. Before installing a new IAC valve, measure the distance that the conical valve (pintle) extends. Then after 15 minutes of driving the idle constantly fluctuates from 800 rpm to 1200 rpm at stop lights. Started on: 12-29-2014 10:00 PM: Replies: 24 (555 views) Last post by The IAC valve is easy to replace, if you have a 32mm socket (V6, may be different for four-cylinders). 86 2. One can of carb cleaner, a set of brass brushes, and a rebuild kit (GP Sorensen part # 96-617), plus two hours of slow, methodical labor. I think I replaced just about all the vacuum hoses except for under the manifold. The fact that the engi May 10, 2020 · Hello everyone, first time on the Fiero forum, 1988 Fiero GT 2. 8, 4-speed manual) with a persistant idle issue that has me a bit stumped. You can go over the system if your not happy with where it is idleing. I took it out on the road and drove it hard to air it out a little. 8 seconds! 87 FIERO CPE 2. I also installed a new Denso oxygen sensor at the same time, old one was an AC Delco that was maybe 2 years old Dec 29, 2003 · I have an 87 V6 5 speed with 35,000 origional miles. After coming back the idle a set back to 900-1000. C Idle Air Control Question? by brentzky. Code 42 - Electronic Spark Timing If the vehicle will not start and run, check the wire leading to terminal 12 of the ECM. Phil-----87 FIERO GT 2. I guess I'm chalking this problem up to the vacuum leaks. Post Reply Mar 15, 2007 · I have two different 3. It would eventually Apr 21, 2010 · Pennock's Fiero Forum Technical Discussion & Questions - Archive Idle speed too low T H I S I S A N A R C H I V E D T O P I C : Idle speed too low. The threads say to plug the IAC hole with a finger to see if the car dies. Use ECM scan tool to see ECT and other sensors output. Jan 3, 2024 · IAC "reset" when drive > 30-35MPH. According to my 84 factory service manual, the distancefrom the main body of the idle air control valve to the tip of the cone should be no greater than 28mm (1-1/8 inches). 6 rockers, DM 57mm TB with Troy's short runner intake, DM ported lower manifold, P/P heads that are decked to b Mar 23, 2016 · IAC T H I S I S A N A R C H I V E D T O P I C : IAC. May 2, 2011 · Dose anyone have the reset instructions to get the IAC to relearn? The darn thing is idling at 2200 rpm, does not seem to want to drop at all. 5's I have checked the codes, and it was giving me a code 33, I replaced the map sensor and reset the computer, and now have no codes stored at all! But I can't get it to have the fast warm up cycle at all! I p Feb 19, 2009 · With your new combination, you are going to need to reset the IAC, reset the base idle speed, and TPS. Originally posted by perceptionist: May 2, 2011 · Just posting this in case it might help someone else. Jan 11, 2012 · I have an '88 2. I bough Mar 1, 2009 · Wait 45 seconds for IAC to fully seat, then with ignition still on disconnect IAC connector. If you stay off the throttle it will idle but its very rough and wants to die then finally dies. If cold to really cold, low temp of ECT and others can make Idle RPM higher. Then shut down, plug in the IAC and reset the computer. What should be the rpm for my car? I seems that I can't get it to idle lower than 1200. fiero will Member Replaced the IAC (no ecm reset) and after a few minutes of driving got a engine light, stopped and checked it was 35 and 44. Blanking off EGR hose at plenum. The throttle plate is fully closed and engine will not run with the IAC fully extended. Apr 21, 2010 · The IAC will self adjust in the bore once installed, simply jumper A and B together before plugging the 4 pin connector back on to the IAC ( MAKE SURE IAC IS INSTALLED INTO THROTTLEBODY BEFORE PLUGGING IN ). The engine tends to quit. Hello, I Will try to reset my idle stop screw and I Will follow This procedure (v6 engine) Ogre cave reset idle stop procedure My question is if the engine must be cold or warm (into closed loop mode). Even if you’re not getting any codes this is a great test to determine the proper function of the IAC system. 54 volts +/-. Now start the car. Stick cars, carefully load the clutch a bit should do same but don't drag a clutch very long and heat up or burn that. If there's a solutio Brandon Flannery shows you how to adjust your IAC. Start engine. Could this be the cause of this? Thanks for any help. ⚠️ Very Low to dead battery can kill the alternator because pulls too many amps. Pennock's Fiero Forum Technical Discussion & Questions Iac valve Iac valve by newfiejeff. Scan tool data indicating “0” IAC counts means the IAC valve is fully extended (shutting off idle airflow to the engine); and “255” IAC counts means the IAC valve is fully retracted, allowing as much air to enter the engine via the throttle bypass passage as possible. Really, I gotta say the cooling efficency is really good. Once that is reset, it should at least try to idle. I have a 195* thermostat should I go colder? Thanks guys Feb 4, 2003 · Okay, I have an 85 2M4. I bridged the A/B connector 2. 87-88 Fiero L4 can so this. Adjust idle speed to specifications using throttle stop screw. In Fiero only applies to 87-88 w/ 4cyl. Or check it out in the app stores Home Jan 11, 2012 · My car is an 86 2M4. Figured it wouldn't hurt to spray a little more, until the check engine light came on. Wait a minute for the engine idle to level off, then use a pen and paper to write down the RPMs that your engine settles and idles at. If idle speed is above 800+/- 50 rpms, locate and correct vacuum leak. 1. I had to replace/repair a lot of stuff. 3000 on cold start and 1500-2000 on warm idle. Than Feb 19, 2001 · I just did the diagnostic check on my 85 SE. Give it a try. Check for low fuel pressure or water in fuel. Do you think it is do to carbon build up, vaccum leak, or the IAC needs to be cleaned or replaced, or. Note that you will often get high idle first after replacing or often cleaning IAC because you often mess w/ the motor to install/clean it. Fixed the code 22 with a new TPS and reset the ECM. Resetting the IAC must have magnified the effects of it. Sep 7, 2009 · Can someone please tell me how to adjust the IAC on my 2. I've spent some time fixing a few things on the Feb 1, 2024 · If your scanner has a IAC steps shown, then record the IAC steps on a cold engine start at KOEO (Key On, Engine Off) as well as engine coolant and air temp. You can see this happen on ECM scan tools. 1987 Merkur XR4Ti. RockAuto ships auto parts and body parts from over 300 manufacturers to customers' doors worldwide, all at warehouse prices. Anyway, removed the IAC, cleaned (again), oiled & reset the pintle, re-insta. Apr 14, 2009 · IAC VALVE ASSEMBLY; Attaching screws coated with appropriate "Loctite blue 262 " Tighten. The TPS appears to have the same numbers 219A as the Fiero and the IAC looks good too. While idling, it revved up and down between about 1800-2800 RPMs. The new one I ended up purchasing was also bad (Coincidence Oct 27, 2021 · ECM uses ECT to set Cold Idle even when IAC is reset after driving > 35 MPH after discon the battery etc. Remove IAC, clean the PISS out of everything 2. I unscrewd the iac from the t/b. The set screw in the throttle body is for minimum air flow through the May 2, 2011 · With the engine stopped, the IAC count is 95 or above, and as soon as you start the engine and let it achieve the proper idle speed, the IAC count is between 1 - 50 (where the counts represent the number of steps the ECM has commanded the IAC to close from full open) according to page 6E3-A-6 of the '88 FSM. You just need to find out why it does this. No check engine light, but the computer did show the infamous code 32. And I just got TPS. Turn the key on, wait 10 seconds or so, and turn the key back off. I bought this 1988 GT thru a police impound yard in CA. And the idle adjustment screw was turned back to its factory position. I've spent some time fixing a few things on the Apr 21, 2010 · the engine is properly tuned, you can go through the IAC system. Here's the procedure for setting the IAC on a V6. Does the IAC operate at 5v. If a sensor etc change happens w/o battery disconnected then ECM often have bad data and may think IAC is Reset but isn't and have same problem until drive > 35 MPH. You have just reset the IAC to a known position for the RockAuto ships auto parts and body parts from over 300 manufacturers to customers' doors worldwide, all at warehouse prices. First thing I do is check for vacuum leaks, find none (carb spray method). Turn the key to on and verify the SES light is flashing. I have the recommended 195* thermostat Rodney states. Does the IAC just unscrew? It seems kind of stiff for never having been on a car. Feb 19, 2009 · First off, thanks for everyone that contributes to this forum. It does not stall but it is annoynig. I just replaced my IAC valve and still having same issues. It moves in and out about 1/32" when it's pulsing. This was happening more when the engine was warm, but has been occurring more frequently recently. 5 and 5 speed and AC, I picked up last fall, it drove well the 60 miles I drove it last fall. My Idle is at about 1900 rpm. My most recent swap is a more aggressive na swap with 272 cam,1. But the ECM will also have programmed into it a higher idle speed when idle. For Auto Cars, just moving shifter slowly from P R N D and back will move the IAC. The IAC valve position is referred to as IAC counts. Jumper A and B in the ALDL to put into diagnostic mode 7. In diag mode I could see it close but as soon as I turned the ig Jan 17, 2013 · How to clean a throttle body and Idle air control valve (iac). Having my fingers partly over it, I can control the idle to which it should be. After "reset" then can "see" it move in ECM scanner as IAC Step Count in ECM data stream. Auto. If I didn't give enough info just say so. ) I think in bin a long while. A code 35 (idle air control) and now it hesitates BAD everynow and then. I have read the minimum idle adjust procedure where you jumper out the ALDL, , key on, disconnect the IAC connector, key off, remove jumper, start engine and adjust set screw for 500-600 rpm, key off, reconnect IAC connector. We talk about why you would want to reset your IAC, symptoms of a bad IAC, and replacement c Jan 16, 2001 · Hi people! I have a 84 SE automatic 105,000 miles I just picked up, It has this small problem! At start up it will idle at 1,000 rpms. Choose top quality brands AC Delco, APA/URO Parts, DIY Solutions, Delphi, Forecast, Replacement, Standard Motor Products, TRQ, United Automotive, Walker, Wells. Up to 2000+ when first started even if the ECM says IAC Reset is true/yes. 5l IAC does not work. Sep 24, 2001 · I just got my Idle Air Control Valve in from The Fiero Store. 8L, When I first start the car it idles very good at 1500 and the engine runs very smoothly. 1985 Pontiac Fiero GT. Mar 23, 2016 · The question is in the title. Since you can't drive it, you can reset it electronically: With the IAC valve connected put a jumper wire between terminals A & B on the ALDL connector in the center console (like for diagnostic mode). The set screw in the throttle body is for minimum air flow through the Short backstory. This freezes the IAC fully closed. Seemed to smooth out the idle a bit. Its on a 4cyl. You may clean the idle air control valve by bathing it in petrol and then blasting it with compressed air. Did the reset procedure but no luck. You can do resistance checks on the windings as described already, but that's about all you can do besides connect it to the ECM and go through the IAC reset procedure. Thanks for Watching I edited this once I guess I'm doing it again. After returning the idle screw back to the factory setting, I readjusted the TPS to 0. Blown through egr solenoid to valve pipe. Performed a maj tune-up, new plugs, wires, distributor, PCV, adjusted the timing (was about 20 deg advanced), cleaned the throttle body, injector, and IAC. Replaced the IAC, now the idle is at 1800RPM, no codes. Jan 19, 2015 · The idle screw is set back to it's original factory location now and I did a full IAC test and reset. The IAC was replaced last year and I have not driven the car more than 300 miles since it was installed. What type of scanners are you people talking about and where can I buy one at a reasonable cost. -----My Fiero: 1986 Pontiac Fiero GT, V6, 4-speed manual [This message has been edited by FieroCat (edited 01-17-2017). 5L 151 CI w/ a 5MT) from an owner who seemed to have no idea how to fix things correctly; being, this car was neglected maintenance wise. ] 3. The engine idles at 1500 rpm when warming up. After I do that my IAC counts on my scan tool are very low, around 3-4 counts with a warm engine. Nov 26, 2023 · But you can't drive > 35mph mean IAC did not reset often causes High Idle because ECM just guessing to keep running. I do mostly city driving ( a lot of stop an go ). It was really simple, easier than rebuilding a carburetor, and very similar. Now walk forward and turn the key OFF, then remove the jumper from the ALDL connector. After checking everything I could think of I did the reset procedure for the IAC. As usual I have had to strip the brakes, clean & grease the caliper sliders, readjust the handbrake cable outside manufacturers specs and sand all the pads to break the glaze. Anyone have any suggestions what else I Feb 23, 2004 · From my factory service manual for my 87 V6: If idle is too high, stop engine. Now It idles about 800 give or take. 8. I reset the IAC adjustment by jumping the pins on my obd1 connector with the engine cold waiting about 30 seconds and disconnecting it from the wiring. Cold start idle is 1500-1600. If it IS clicking then simply pull the electrical connector from the IAC. Ensure set screw has not been tampered with, if it has, reset it as stated above 3. turned off ignition key and unhooked the A/B bridge 5. Start engine and allow engine to go into "Closed Loop". I have a scanner that is used to read codes and reset the computer but it doesn't do any of the above mentioned !!! Oct 15, 2004 · Before I put in the new iac it was at 1500 rpm. Check out free battery charging and engine diagnostic testing while you are in store. If idle speed is too low, your engine might be running too rich (low air/fuel ration). Oct 25, 2014 · reset of IAC took time seemed simple yet never got dialed in 'till compared re-set instructions in Haynes with Ogre's Fiero iac re-set. Local stores unable to obtain a gasket and online resources have been without success. ECM and IAC will adjust engine idle even if idle stop is way Mar 23, 2016 · The pic is a diagnostic procedure for a code 35 which is a failure in the IAC (actually it’s when the ECM doesn’t see the idle react the way it should). May 2, 2011 · Hi again from the UK. if it I'm wrong all Mar 23, 2016 · Reversing the polarity of one of the IAC coils won't burn anything up. Aug 19, 2003 · If the idle is moving up and down and stops when you unplug the IAC. No problems. I removed the IAC and pushed the pintle in (so the distance was less than 1 1/8") and reinstalled. Issue was a Bad Fuel Injector. May 2, 2011 · I spent a couple hours this morning rebuilding the throttlebody on my 84. IAC is 2 phase Stepper Motor driving the valve in/out. I've never heard of that again. With the IAC reset and disconnected the cold idle was at 650 in gear, and warm idle in gear was about 800. I don't have any note about it. Air feed to egr solenoid was off. I did all the normal calibrations. 9 L engine. 5 5spd 86 FIERO RockAuto ships auto parts and body parts from over 300 manufacturers to customers' doors worldwide, all at warehouse prices. Wait for 30 seconds so the IAC is fully closed. DISCLAIMER:The individual featured on the Phillips Idle Air Control (IAC) Valve Choose for Me to Minimize Cost Choose for Me to Minimize Cost Related Parts Air Intake / Charge Temperature Sensor Emission Repair Manual Fuel System Repair Manual Idle Air Control (IAC) Valve Connector Idle Speed Control Motor Connector Throttle Position Sensor (TPS) Jul 10, 2020 · The symptoms of a bad idle air control valve are an illuminated check engine light, stalling, wrong idle speed, and the rare instance of the engine failing to start. This is a rebuilt 2. Again, I am not sure that this works for a Duke. Even when scan tool said IAC Reset Yes/True Feb 6, 2006 · the engine is properly tuned, you can go through the IAC system. 32 deg F is 3000 RPM. This shows you how to fix a high idle, low idle, and or rough idle. Most modern cars have an i May 3, 2000 · I have an 86 Fiero and it idles at 1500+. Is it hest 88 base notchback 2. anyway my question is after running over 40MPH consistently do I have to disconnect the battery still and reset the ECM ? will by EC So here's the deal: I have a 1986 Fiero GT (155,000 miles, stock 2. 5L 5-speed. Sep 7, 2009 · after resetting the ECM, install the IAC back into place. Can You Clean the Idle Air Control Valve? The idle air control valve can indeed be learned. But my idle is higher than a normal fiero 2. I've learned so much about Fiero's and how to fix them - i hope with that said, I spent about 1. thanks to all from this great forum for the help! gotta fix door and darn valve cover leak next and looking for another duke. I do not know weither it pushes in and out, or weither it spins in and out. Ensure set screw has not been tampered with, if it has, reset it as stated Mar 14, 2013 · . the EGR tube and hole are blocked off. Turn ignition off and reconnect IAC connector. Now as you can imagine, this makes cold starts difficult. Idle is controled by the IAC valve (idle air control) via the computer and is not adjustable. I did the a/ Mar 17, 2018 · Buy a 1987 Pontiac Fiero Idle Control Valve at discount prices. The IAC is working just fine. Problem is that if I have the IAC plugged in, then the car bogs HARD, just chugs and if I can get it to a higher RPM then it'll shoot a hell of a flame. Mar 9, 2024 · If ECM loses standby power for any reason, yes IAC needs to "reset" & requires Fiero V6 & older L4 to drive over 35mph. Heres what else I did under the decklid over winter: -Relp Aug 11, 2006 · After charging the battery, I expected that the IAC solenoid would function when I had driven the car at highway speeds - it doesn't, the car won't idle. Ogre's dialed it in! fuel injector lower "O"ring tightness is vitaleasy fix. Turned the ignition key, let the computer flash code 12 three times 3. The set screw in the throttle body is for minimum air flow through the May 20, 2019 · Andy Phillips shows the steps to remove and replace the Idle Air Control (IAC) Valve on a Pontiac Fiero GT. I would suggest that you clean the IAC with carb cleaner and the bore it screws into. 8L Thanks-----His: ´91 Camaro Z28 May 2, 2011 · If he check with scan tool reconnect IAC and reset again (700 tbi, IAC reset) around 15 IAC step. Do I need to disconnect the battery to reset the ECM too? Here's the long story: I've been working on the car for weeks trying to get it road ready again. I have the auto trans if that makes a difference. Mar 15, 2007 · a complete ECM reset of all learned parameters, including the learned IAC ones. I know that my other fiero idle was dead on 900RPM. There are some learned Apr 21, 2010 · Then I finally did the reset of the IAC by jumping the two contacts, turning on the ignition, letting the IAC settle, unplugging the IAC, turning off the ignition, and putting it back together. The noises won't stop. Apr 21, 2010 · 3800sc idling problem by fiero will. My first is about 5 years old and is a 3. Remove ground from diagnostic terminal. Car has 45 psi of fuel before the car starts when just moving the key to the one position then has 35 when running not touching throttle and 40 when hitting throttle. 45mv at Key ON Engine OFF 4. Jun 13, 2015 · Hey guys I just replaced my alternator to a cs130 on my 86 fiero. (Auto tranny not in gear. And in fact, when I drove it under the same trip, the CEL didn't light up at all! Yea! BUT - it was actually driving worse!!!!! May 2, 2011 · 1. Install 6. Where's the hole? Inside the throttle body? I want to try this test to see if we have a vacuum leak -- evidently if it's a vacuum problem the car will stay running, even with the IAC hole plugged. But as soon as I replaced it, I mean like within a minute or two my check engine light came on and I checked it out. I've adjusted the TPS and the IAC's values to curb my sail on or engine push ,which was quite bothersome, but I'm not quite sure how to relearn my ECM to the new values. Procedure is to jumper the aldl A & B pins, turn the key to ON for about 30 seconds, then unplug the IAC motor connector, then turn the key to OFF and pull the jumper from pins A & B. 8 stroked to a 3. Check for vacuum leaks. Idles dead slow (about 600 rpm) and dies frequently when stopping in traffic. In drive idle is 1000. 08V - Turn off ignition - Insert a paper clip in slots A & B of ALDL (or enter 'Field Service Mode" with a scan tool) - Turn Jan 8, 2015 · So here's the deal: I have a 1986 Fiero GT (155,000 miles, stock 2. Reset IAC Valve pintle position: A. Since i did that, the idle has been steady at 2000RPM, i got a SES light, pulled codes: its the IAC. Proper idle for the V6 is roughly 900 RPM. Wrench, remove the IAC valve from the throttle body. The ECM should still find the target idle even without the reset. pulling the jumper and then starting the engine. Ground diagnostic terminal. Insert the key into the ignition and start the engine. The ECM will fully close the IAC at this time. Wait a few seconds for the IAC to seat then disconnect the IAC. then the IAC is OK. ] Feb 23, 2004 · Once the throttle body was put back on and the IAC was reset, it started working again. I put the car in diag, put ignition on, heard the click click, off, then started car (our of diag) and I heard the air whistle and idle is not affected. Code 35 is being set (87 GT 2. Ignition on. Do Not reset idle until you check vac leaks etc first. Because if I start the engine when it's cold can i start it without iac ? Thank you. So far I have tried: Resetting the IAC. I was thinking it might be the distributor cap? Any help is appreciated, Thanks Will May 11, 2002 · Ok, I read about several persons on here using scanners to set things such as IAC counts and TPS voltage. Before I got a new iac I did all the normal checks ,egr good,no cracks in hoses etc. This can be hell to figure out. It said to that my IAC valve was bad or should be checked. Using a 1 1 / 4 in. Disconnect the distributor set timing connector. Please advise. The engine should idle properly under control of the ECM. Started on: 10-10-2022 09:40 PM: Replies: 2 (57 views) I've read a lot of threads on this forum and wonder what is the correct idle learn procedure on a Caddy 4. After driving the car, I checked for codes and found none. Disconnect negative battery cable for at least 10 secs to clear PCM Memory. I went back to the IAC valve, which was clicking. While you have the IAC solenoid out, you might spray some cleaner into the port in the throttle body; that gets pretty carboned up, too. St Pennock's Fiero Forum Technical Discussion & Questions IAC postion IAC postion by LornesGT. So I pull the snorkel and stick my finger over the IAC hole in the bottom of the throttle body. This is on a warm car btw. The car is now idling about 1000rpm on the tack give or take 100rpm. "You have to make sure the IAC has been reset to fully closed then drive the car over 35mph for the ECM to relearn the proper IAC position. Well I've started my yearly fight with the government tester to get my stock '86 2. youtube. Aug 18, 2005 · the engine is properly tuned, you can go through the IAC system. I had such great hopes. Started on: 04-06-2009 10:17 PM: Replies: 18 : Last post by: DIY_Stu on 04-11-2009 01:24 PM: Apr 6th, 2009. 4. Obvious when I started looking around the engine compartment. 4 swaps. The set screw in the throttle body is for minimum air flow through the Mar 15, 2007 · I have adjusted them for years to get them at . 8 SE through its' test (MOT we call it!!). Once you have fixed the problem you'll reset the trouble codes and check that they don't reappear. Check for high fuel pressure or leaking/sticking injectors. I could not find any vaccuum leaks. First a little history. I've just put on a new TPS and noticed very improved drivability when cold - but the idle when I first start the engine at approx. I had to drive it about 10 miles before i had the chance to tear it off and put a "temporary" straight pipe in its place. I had already checked the IAC/TB and they were very clean. Good luck! Phil-----GTDude OVER 25 years GM experience Jan 11, 2012 · If it's not clicking rapidly = dead. I put my finger in the opening and was able to get it to idle down to any rpm by moving it in or out. Subscribe To Our YouTube Channels:COMP Cams http://www. Now the "check engine" light comes on. Also, spray the throttle body as you fluctuate the RPM, to clean it. Feb 19, 2009 · This may be a stupid question, but on the duke where is it? Im assuming it has one, but idk why im assuming that, diddnt know if it was only on the 6cyl. Let the engine fully warm up. The engine behaves weird, but you're not getting a code. You will notice at this time the IAC is making noises. 8 V6. N May 2, 2011 · Am suffering from a high idle and I do realize that this topic came by lots. Egr solenoid to TB pipe. Is that normal? Thanks James------------------ It is the mark of an educated mind to be able to entertain a Jul 31, 2023 · In this video we discuss how to reset an Idle Air Control Valve. Reconnect electrical connector 5. So, the problem's with the IAC I pull it and spray out the hole, t I'm not positive on IAC counts, but for my grand prix, (and most likely your fiero as well), you have to ground the ALDL port (as if you're checking the codes), wait 45 sec, unplug the IAC, start the engine, and adjust the idle using the screw to 500-600rpm. Until ECM does so will force idle high because ECM has to guess where IAC is so goes only by RPM. It has no fast idle at all, like my other 2. 4 with a crane 260 cam, stock TB with a Design One turbo kit. Feb 19, 2009 · the engine is properly tuned, you can go through the IAC system. [This message has been edited by JazzMan (edited 11-22-2011). I was told my timing was at 12* for alittle more pe Jan 20, 2024 · Got a weird one for y'all. Since the IAC has a range of 0-50 counts I wou Aug 11, 2006 · I tuned down the idol on my Fiero. Car 84 manual with 23,000 mi. Jun 13, 2024 · Start the engine and take note of the idle RPMs. Reattach Order Pontiac Fiero Idle Air Control Valve online today. Also, check all connections to the IAC and replace the IAC if necessary. I could of course obtain a gasket kit as mentioned in other threads though the question I have is what are the dimensions of the gasket needed? You just don't flop anything in there as the thickness would affect how deep the valve seats. The car refused to idle below 1600 after you took off with it. ) Didn't scan my 300 when doing this but it was over 3000 rpm at idle for a few minutes and I decided to reset it the way writen before and it worked. There is a procedure for setting the IAC on a V6 - not sure about the duke. IAC Valve attaching screws to (27 lb in. I had one that gave me hell and it happened to be the ECM, but that was a fluke. Replace the IAC. I've got the thermac air cleaner connected to the outlet on the muffler and I' Mar 14, 2013 · Alright, so my 85 SE V6 has a high idle. After replacing it the idle was high . ? I really appreciate all your help. 6x volts. The ECM will not attempt to reset it until the engine is warmed up and the car is driven at road speed (I've heard 30 MPH) for a few minutes. All you have to do is disconnect the electrical connector and unscrew it. It slows to about 2500 after about 20 seconds. If ECT says colder then weather low the last several hours then sensor or wires to it could have problems making engine w/ even higher idle then should. (it goes back off when I get up to speed) Don't I remember something about unhooking the battery for 30 minutes to reset the computer control? Then hooking it back up & taking it for a drive so the computer can recalibrate everything? How do I get the "check engine" light to turn back off? (minus unplugging the bulb) Feb 19, 2009 · The idle air control valve on the 84 Fiero is the same as the one used on other 300 series throttle bodies (Fieros from 84-86 and some other pre-87 GM cars). Started on: 11-24-2009 01:15 PM: Replies: 9 : That will force ECM reset IAC to find IAC 0 steps/position. 5 hours on here searching about high idle problems and what causes them. You MIGHT be able to get an adjustable wrench in there, but there's won't be much room to work with. ECM will always reset IAC after starting when driving above ~35mph to check 0 steps. I installed a new IAC in it. Easy to use parts catalog. When I start the car in the morning it is at 1600 to 1700 till it worms up then it works it’s way to 100-900, even when the car is worm Jan 11, 2012 · The IAC is a stepper motor, so you can't just apply 12 volts to the windings and expect it to do anything. Jan 11, 2012 · At the ALDL insert a jumper from A-B. about 1500-1800 rpms. Then reinstall the ECM fuse. Engine Cold, low battery, etc, then ECM can/will force high idle too. Jan 11, 2012 · 88 2. I’ve also seen IAC’s fail without setting codes. Bam, strong vacuum and I can bring the idle down to a stall by blocking the hole entirely. I've reset it multiple times and set it using the factory adjustment method and the "tried and true" method that involves undoing the iac and making the engine idle with that screw at 550 rpm Mar 15, 2007 · I changed the IAC, now the idle is at about 2500 rounds. . This year the tester brought up another fault, the idle is too high!! It' Jun 16, 2020 · Replaced the IAC (no ecm reset) and after a few minutes of driving got a engine light, stopped and checked it was 35 and 44. Sep 7, 2009 · So, last Thursday my idle starts climbing up to 1,500 RPM in my 2. Egr solenoid hose to solenoid sensor was perished. I took the old on out (car had a idle of 2000-3000 RPM until it warmed up) now with the new one it idle's at 3000-4000 rpm (AHHHH!, I'm not waiting to see if it goes down when it warms up) What should I do? Nov 6, 2022 · Some engines in some years also reset the IAC when Park and sees RPM > 2200-2500 when you push the gas pedal. Also what wo Jan 11, 2012 · 84 Iron Duke, auto The engine shudders, feels uneven like 1 or 2 cylinders aren't firing, under 3000 rpm. Once I get over 3000, it runs perfectly fine. Before I did it would always idle about 1300. S. New IAC, wires check good to ecm with ohmmeter, throttle body passages completely clean, Snap-on scanner shoes IAC signal fluctuating like one would expect. Feb 23, 2004 · I am currently at work and have a chance to pick up a free TPS and an IAC off an 80's GM (probably Olds) display. Thank 1987 gt 2. Now walk back and reconnect the IAC electrical connector. Idle not changing. or 12v. What reversing the polarity will do is make it run backwards. I came across a couple of threads that went through the way of approaching the problem. How do I reset it? Mar 14, 2013 · So I have an 86 Sport coupe with 2. Aug 18, 2005 · When I got the car it was not running well at all - chugging, missing, and idleing fast. Code 35 - Idle Air Control This code will be set when the closed throttle speed is 50 RPM above or below the correct idle speed for 30 seconds. Does anyone know the correct way or sequence for the idle learn procedure? I even took the throttle body off Mar 14, 2013 · Not sure about this one and hope you guys can help me diagnose it. Another thing we found was that there was a busted filter screen on the injector. 1. Auto in drive should be around 40-45 step. Do I have to do any learn processes? Engine is 2. ----- Feb 19, 2009 · You have to make sure the IAC has been reset to fully closed then drive the car over 35mph for the ECM to relearn the proper IAC position. The set screw in the throttle body is for minimum air flow through the Jul 31, 2023 · Updated on July 31, 2023. 8 5spd 0-60 in 6. You can test the idle air control valve with an OEM-level scan tool to determine if the engine part has failed. I started it up a few days ago and it idles at 2500, I let it run for a few minutes and noticed the idle would fluxuate between 2500 and 3k rpm. Make sure TPS reads . 8 V6 Fiero. In park or neutral idle is 1200. Maybe a loom problem? A short? The car idles funnyit will fluctuate between like 700 and 1300. I ended up rescuing a 1988 Fiero, base model, (I4 2. I know the throttle posittion sensor has been bad for years but I just recently replaced it. The VSS and speedometer are functioning, so the ECM should have reset the IAC solenoid during the 45MPH+ drive. When I bought this car a couple months ago, it had a high/erratic idle. muiunk ptxs osdn adobn syfiq zus ywik trhi zgtjhd nbedke