Iac
Thread Starter
Cruising
Joined: Mar 2017
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From: Fremont Ne
Iac
I have a 1988 Corvette and I reset the IAC. It doesn't seem to want to start now. I do know the battery is low because I've been running the fan trying to clean it out with one of those stink remover machines.
It cranks, I hoping it's just a low battery. In not any other ideas?
It cranks, I hoping it's just a low battery. In not any other ideas?
Zen Vet Master Level VII
Joined: Mar 2016
Posts: 5,213
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From: Southlake, TX
Welcome to the forum!
The IAC (or lack of a functioning one) wont really have an effect on your car starting or not. Now, once running, your IAC will control you idle speed during warm up.
If you know your battery low, you need to get that fixed. You engine will need to spin fast enough to catch.
The IAC (or lack of a functioning one) wont really have an effect on your car starting or not. Now, once running, your IAC will control you idle speed during warm up.
If you know your battery low, you need to get that fixed. You engine will need to spin fast enough to catch.
Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
Please explain how you did that.
The IAC will be reset if you connect ALDL pins A and B together. It continuously tries to close and you can hear it clicking when it runs out of adjustment (completely closed and bottomed out).
The IAC will be reset if you connect ALDL pins A and B together. It continuously tries to close and you can hear it clicking when it runs out of adjustment (completely closed and bottomed out).
Team Owner
Joined: Jul 2004
Posts: 28,331
Likes: 3,245
From: Hartford WI
I have a 1988 Corvette and I reset the IAC. It doesn't seem to want to start now. I do know the battery is low because I've been running the fan trying to clean it out with one of those stink remover machines.
It cranks, I hoping it's just a low battery. In not any other ideas?
It cranks, I hoping it's just a low battery. In not any other ideas?
Thread Starter
Cruising
Joined: Mar 2017
Posts: 10
Likes: 0
From: Fremont Ne
The reason I reset it, I replaced it with a new one and forgot to set the same as the old one.
Do you have any ideas as to why I keep getting a code 32 and 33? I replaced the MAF with a new after market one last year. The code went away for a few months and then popped up again. I might have bought a cheap one.
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Team Owner
Joined: Jul 2004
Posts: 28,331
Likes: 3,245
From: Hartford WI
The reason I reset it, I replaced it with a new one and forgot to set the same as the old one.
Do you have any ideas as to why I keep getting a code 32 and 33? I replaced the MAF with a new after market one last year. The code went away for a few months and then popped up again. I might have bought a cheap one.
Do you have any ideas as to why I keep getting a code 32 and 33? I replaced the MAF with a new after market one last year. The code went away for a few months and then popped up again. I might have bought a cheap one.
32 is EGR and 33 is MAF circuit. For your 33, could it be the relay maybe? I don't have an FMS for that.
Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
I did fully charge up the battery and it started right up.
The reason I reset it, I replaced it with a new one and forgot to set the same as the old one.
Do you have any ideas as to why I keep getting a code 32 and 33? I replaced the MAF with a new after market one last year. The code went away for a few months and then popped up again. I might have bought a cheap one.
The reason I reset it, I replaced it with a new one and forgot to set the same as the old one.
Do you have any ideas as to why I keep getting a code 32 and 33? I replaced the MAF with a new after market one last year. The code went away for a few months and then popped up again. I might have bought a cheap one.
Error code 32 is EGR SYSTEM failure. If the EGR is not working you will get this error. It is usually caused by the EGR valve not opening and the EGR thermo switch not getting hot. A bad thermo switch or broken wire will also cause an error 32.
Error code 33 is MAF signal error. It happens when the MAF is not communicating with the ECM. That's usually caused by a poor connection (corroded) on one pin in a connector, but could be a broken wire.
Last edited by Cliff Harris; Mar 23, 2017 at 02:37 AM.
Thread Starter
Cruising
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From: Fremont Ne
I was reading up on that this morning. Maybe
Thread Starter
Cruising
Joined: Mar 2017
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From: Fremont Ne
The IAC is recalibrated by the ECM every time you turn on the ignition. You don't need to do anything else. The FSM tells you to set the length of the IAC pintle because the plastic guide will break if the pintle is extended too far when the IAC is screwed in. The pintle bottoms out and then twists and breaks the plastic guide inside the IAC.
Error code 32 is EGR SYSTEM failure. If the EGR is not working you will get this error. It is usually caused by the EGR valve not opening and the EGR thermo switch not getting hot. A bad thermo switch or broken wire will also cause an error 32.
Error code 33 is MAF signal error. It happens when the MAF is not communicating with the ECM. That's usually caused by a poor connection (corroded) on one pin in a connector, but could be a broken wire.
Error code 32 is EGR SYSTEM failure. If the EGR is not working you will get this error. It is usually caused by the EGR valve not opening and the EGR thermo switch not getting hot. A bad thermo switch or broken wire will also cause an error 32.
Error code 33 is MAF signal error. It happens when the MAF is not communicating with the ECM. That's usually caused by a poor connection (corroded) on one pin in a connector, but could be a broken wire.
Thanks
Team Owner
Joined: Jul 2004
Posts: 28,331
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From: Hartford WI
Just for the hell of it, did you clear the code? Pull fuse to ECM or something so you can scan it and have no history codes?
Thread Starter
Cruising
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From: Fremont Ne
Instructor
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