Fiero iac reset. Auto in drive should be around 40-45 step. 54 volts +/-. After I do that my IAC counts on my scan tool are very low, around 3-4 counts with a warm engine. This behavior continues for around 5 minutes until the car is warmed up, then it runs and drives just like normal. Do Not reset idle until you check vac leaks etc first. I guess I'm chalking this problem up to the vacuum leaks. I know that my other fiero idle was dead on 900RPM. Then reinstall the ECM fuse. Wrench, remove the IAC valve from the throttle body. May 2, 2011 · 1. Since the IAC has a range of 0-50 counts I wou Feb 19, 2009 · With your new combination, you are going to need to reset the IAC, reset the base idle speed, and TPS. Remove ground from diagnostic terminal. Once the IAC valve relearn procedure has been relocated, detach it and cut any wiring. Since the IAC has a range of 0-50 counts I wou 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. You have just reset the IAC to a known position for the Jan 11, 2012 · I have an '88 2. Turn the key on, wait 10 seconds or so, and turn the key back off. -----My Fiero: 1986 Pontiac Fiero GT, V6, 4-speed manual [This message has been edited by FieroCat (edited 01-17-2017). 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 Jan 11, 2012 · The Ogre's Fiero Cave IAC Reset if RPM>2000 for first time Integrator reset criteria disabled Burst knock retard disabled 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. 45mv at Key ON Engine OFF 4. There are some learned I've read a lot of threads on this forum and wonder what is the correct idle learn procedure on a Caddy 4. I completely soldered every splice and used heat shrink tubing to protect them. adjust pintle length to 1 1/8" -measured from mounting surface of IAC casing to tip of pintle 5. When I bought this car a couple months ago, it had a high/erratic idle. 8l. Proper idle for the V6 is roughly 900 RPM. You can go over the system if your not happy with where it is idleing. Start the engine and record the IAC steps, engine coolant and air temp, commanded ignition timing, and BLM value after 1 minute of running. Th Jan 11, 2012 · At the ALDL insert a jumper from A-B. 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. May 10, 2020 · Hello everyone, first time on the Fiero forum, 1988 Fiero GT 2. Really, I gotta say the cooling efficency is really good. So if anyone could please help me and send me a picture of there plug showing me the color placement so I can rewire i Mar 1, 2009 · Wait 45 seconds for IAC to fully seat, then with ignition still on disconnect IAC connector. 1987 Merkur XR4Ti. Engine Cold, low battery, etc, then ECM can/will force high idle too. 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. Anyone have any suggestions what else I 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. Unplug the electrical connector for the IAC. 8L, When I first start the car it idles very good at 1500 and the engine runs very smoothly. This is on a warm car btw. 1985 Pontiac Fiero GT. We talk about why you would want to reset your IAC, symptoms of a bad IAC, and replacement c Feb 19, 2009 · the engine is properly tuned, you can go through the IAC system. 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. 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. 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. The engine should idle properly under control of the ECM. After "reset" then can "see" it move in ECM scanner as IAC Step Count in ECM data stream. Until ECM does so will force idle high because ECM has to guess where IAC is so goes only by RPM. The set screw in the throttle body is for minimum air flow through the 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. No wonder so many pickup truck owners insist on 匚𝕦𝕞𝕞𝕚𝕟𝕤 or nothing at all. 8 V6). You will notice at this time the IAC is making noises. But my idle is higher than a normal fiero 2. Wait for 30 seconds so the IAC is fully closed. The measurement should be made from the valve housing to the end of the pintle cone. I just replaced my IAC valve and still having same issues. 5l l4 Automatic trans with 75xxx miles on it. Easy to use parts catalog. 4. Install 6. You may clean the idle air control valve by bathing it in petrol and then blasting it with compressed air. The engine is still running rich (it burns my eyes to stand over the engine bay) and after coming to a stop the engine takes 15-20 seconds to come down to around 1k from 2k. 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) Oct 27, 2021 · ECM uses ECT to set Cold Idle even when IAC is reset after driving > 35 MPH after discon the battery etc. Most sensors/accessories have been replaced (IAC, MAP, O2, CTS, distributor cap/rotor, plugs, tstat, few others). Now walk forward and turn the key OFF, then remove the jumper from the ALDL connector. 8 Fiero: Pico #5612C - IAC Valve Pico #5613C - MAP Sensor Pico #5617C - TPS Mar 15, 2007 · the engine is properly tuned, you can go through the IAC system. 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). If there's a solutio 3. Seemed to smooth out the idle a bit. 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). 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 GM etc Books said 700 TBI does reset IAC w/o driving when ECM see throttle over ~2000rpm for xx seconds. I don't have any note about it. ] Jan 8, 2015 · So here's the deal: I have a 1986 Fiero GT (155,000 miles, stock 2. 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. ) Idle RPM also depends on Transmission Type and in case of AT "in gear" or not. 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. 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, ). The person I got it from tried to convert it from TBI to carbureted, I just ordered a new throttle body for it but now the issue I am having is the wires for the idle air control sensor has been cut off. 08V - Turn off ignition - Insert a paper clip in slots A & B of ALDL (or enter 'Field Service Mode" with a scan tool) - Turn Mar 15, 2007 · a complete ECM reset of all learned parameters, including the learned IAC ones. RockAuto ships auto parts and body parts from over 300 manufacturers to customers' doors worldwide, all at warehouse prices. 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. Start Car - there may be some initial hesitation, and even dying from the motor the first 2-3 starts, the IAC will self adjust. You need to charge or replace a "Dead" battery before starting. Jan 11, 2012 · If it's not clicking rapidly = dead. 86 2. Engine on. Ensure set screw has not been tampered with, if it has, reset it as stated above 3. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should. 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. The noises won't stop. Up to 2000+ when first started even if the ECM says IAC Reset is true/yes. Turn ignition off and reconnect IAC connector. Does anyone know the correct way or sequence for the idle learn procedure? I even took the throttle body off 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. 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. Can You Clean the Idle Air Control Valve? The idle air control valve can indeed be learned. It would eventually May 20, 2019 · Andy Phillips shows the steps to remove and replace the Idle Air Control (IAC) Valve on a Pontiac Fiero GT. Reattach So I have an 88 With a 2. Use a ECM/PCM scanner to see IAC Reset Yes/No Wile there get speed matches for ECM to Speedo in the dash. Check for vacuum leaks. Remove IAC, clean the PISS out of everything 2. 5L 5-speed. Capped the lines at the coolant neck, deleting the coolant bypass in the process. Turn the key to on and verify the SES light is flashing. If I didn't give enough info just say so. (Auto tranny not in gear. The GM service manual states the following: - Turn ignition to "on" - Check TPS voltage, adjust to . 1. 8 V6. 8 stroked to a 3. pulling the jumper and then starting the engine. 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 was having the engine cut off issues prior to changing my alternator. 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 Jun 11, 2023 · You should reset computer after replacing the IAC. 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. Apr 21, 2010 · 9. 10. 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. Posted by u/nicedayforanexorcism - 5 votes and 6 comments 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 on cold start the tach reads 2500-3000. Now as you can imagine, this makes cold starts difficult. I've spent some time fixing a few things on the In Fiero only applies to 87-88 w/ 4cyl. I had a coolant leak on the top of the motor under the upper plenum. Then shut down, plug in the IAC and reset the computer. Just replace coil cap and rotor. You can see this happen on ECM scan tools. Start engine and allow engine to go into "Closed Loop". Pulled the plenum and it was the throttle body coolant lines. Using a 1 1 / 4 in. 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. 9 L engine. If it IS clicking then simply pull the electrical connector from the IAC. ECM will always reset IAC after starting when driving above ~35mph to check 0 steps. Before installing a new IAC valve, measure the distance that the conical valve (pintle) extends. I have the recommended 195* thermostat Rodney states. ----- Mar 17, 2018 · Buy a 1987 Pontiac Fiero Idle Control Valve at discount prices. 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. Resetting the IAC must have magnified the effects of it. Jumper A and B in the ALDL to put into diagnostic mode 7. Some will reset IAC when you hold the gas above ~2000RPM for 30sec to 1 minute but many ignore you. Choose top quality brands AC Delco, APA/URO Parts, Autopart Premium, DIY Solutions, Delphi, Forecast, Replacement, Standard Motor Products, TRQ, United Automotive, Walker, Wells. There was serious issues with the hard vacuum lines, they had been glued together to fix breaks previously. This left the car with a very high idle (3000 rpm). ⚠️ Very Low to dead battery can kill the alternator because pulls too many amps. Code 42 - Electronic Spark Timing If the vehicle will not start and run, check the wire leading to terminal 12 of the ECM. (Jurassic Park) The Ogre's Fiero Cave Aug 8, 2017 · I just picked up a 1984 fiero 2. This will now reset the IAC to a known key-off "park" position. Use ECM scan tool to see ECT and other sensors output. 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. Originally posted by perceptionist: Hopefully it stays this way. 1985-88 VALVE KIT, idle air control 17111288 (no price listed) From: Aaron Smith. Jan 19, 2015 · The old/beat-up TPS, IAC and MAP sensor pigtails are now replaced with new. Normally people just drive the car over 35 mph and it will auto reset. This freezes the IAC fully closed. While idling, it revved up and down between about 1800-2800 RPMs. Let the engine fully warm up. Idle is controled by the IAC valve (idle air control) via the computer and is not adjustable. Figured it wouldn't hurt to spray a little more, until the check engine light came on. Even when scan tool said IAC Reset Yes/True RockAuto ships auto parts and body parts from over 300 manufacturers to customers' doors worldwide, all at warehouse prices. Make sure TPS reads . May 2, 2011 · If he check with scan tool reconnect IAC and reset again (700 tbi, IAC reset) around 15 IAC step. Jan 11, 2012 · I have an '88 2. The set screw in the throttle body is for minimum air flow through the 1987 gt 2. 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. The set screw in the throttle body is for minimum air flow through the That will force ECM reset IAC to find IAC 0 steps/position. This is a rebuilt 2. Remove the Idle Air Control Valve (IAC) electrical connector. They use the same IAC valve. If cold to really cold, low temp of ECT and others can make Idle RPM higher. 8. Now walk back and reconnect the IAC electrical connector. Disconnect the distributor set timing connector. For Auto Cars, just moving shifter slowly from P R N D and back will move the IAC. 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 Jan 3, 2024 · IAC "reset" when drive > 30-35MPH. IAC is 2 phase Stepper Motor driving the valve in/out. Adjust idle speed to specifications using throttle stop screw. 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. Feb 23, 2004 · Okay, so I sprayed some throttle body cleaner into the TB. ECM and IAC will adjust engine idle even if idle stop is way Jan 20, 2024 · Got a weird one for y'all. 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. The ECM will fully close the IAC at this time. ) [This message has been edited by theogre (edited 08-21-2015). The car refused to idle below 1600 after you took off with it. With the IAC reset and disconnected the cold idle was at 650 in gear, and warm idle in gear was about 800. No check engine light, but the computer did show the infamous code 32. The IAC valve position is referred to as IAC counts. -----Dr. Check for vacuum leaks by covering the IAC inlet passage inside the bore of the TB with your finger, if the engine continues to run at ANY RPM, you do indeed have a vacuum leak. The set screw in the throttle body is for minimum air flow through the Did you reset the IAC motor when you installed it. 87-88 Fiero L4 can so this. Now start the car. I was told my timing was at 12* for alittle more pe Aug 18, 2005 · the engine is properly tuned, you can go through the IAC system. If you're looking for a used one, or live somewhere where Fiero parts are expensive and hard to come by, you might want to ask/look for an IAC for a Chevy 305 or 350 TPI engine. Code 35 is being set (87 GT 2. ) I think in bin a long while. This is 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 匚𝕦𝕞𝕞𝕚𝕟𝕤 pickup truck engines provide legendary power, reliability and durability. 8, 4-speed manual) with a persistant idle issue that has me a bit stumped. Jun 13, 2015 · Hey guys I just replaced my alternator to a cs130 on my 86 fiero. 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. So far, these are the GM-style pigtails that I have confirmed to fit properly on a 2. Feb 6, 2006 · the engine is properly tuned, you can go through the IAC system. 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). If you stay off the throttle it will idle but its very rough and wants to die then finally dies. Sep 7, 2009 · after resetting the ECM, install the IAC back into place. I removed the IAC and pushed the pintle in (so the distance was less than 1 1/8") and reinstalled. ] In this video we discuss how to reset an Idle Air Control Valve. 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. DISCLAIMER:The individual featured on the Phillips If none of these fix your problem, then go get an IAC valve. Replace the IAC. 6 days ago · 9. xfye tsro dnulba fygf rrww hodc pasii fhccd twlnsyhv trfehoi
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