IAC Removal
- Thread starter iwantatta
- Start date
Used a 10" adjustable wrench like whitehot1 suggested. No problems getting it off. Just wanted to see what the IAC was all about and make sure nothing looked obviously wrong before going off on some more difficult options. Idle adjustment screw does nothing to change the IAC.
Scanmaster at warmed up temp reads IAC=0 and TPS = .42v RPM = 1250. When cold it starts off IAC=175 and as the car warms up it quickly approaches 0. I've followed all the lines off the vacuum block and done the propane method to no avail.
I followed the service manual which i have which mention as a diagnostic aid:
If idle is too high, stop engine. Ignition "ON". Ground diagnostic terminal. Wait 30 seconds for IAC to seat, then disconnect IAC. Unground diagnostic terminal and start engine. If idle speed is above 800 +/- 50 rpm, locate and correct vacuum leak. So right now i'm currently building a little smoke tester.
Scanmaster at warmed up temp reads IAC=0 and TPS = .42v RPM = 1250. When cold it starts off IAC=175 and as the car warms up it quickly approaches 0. I've followed all the lines off the vacuum block and done the propane method to no avail.
I followed the service manual which i have which mention as a diagnostic aid:
If idle is too high, stop engine. Ignition "ON". Ground diagnostic terminal. Wait 30 seconds for IAC to seat, then disconnect IAC. Unground diagnostic terminal and start engine. If idle speed is above 800 +/- 50 rpm, locate and correct vacuum leak. So right now i'm currently building a little smoke tester.
Ignore that service manual stuff since you can actual read your IAC counts.
Since you're reading ''0'', that means the ECM has commanded the IAC to close as far as it's mechanically able. That mean one, or both, of two things. Either your throttle blade is open too far and passing so much air it took the IAC port out of the loop. Or, you've got some crud between the IAC pintle that's leaking unwanted air into the engine.
Since you're reading ''0'', that means the ECM has commanded the IAC to close as far as it's mechanically able. That mean one, or both, of two things. Either your throttle blade is open too far and passing so much air it took the IAC port out of the loop. Or, you've got some crud between the IAC pintle that's leaking unwanted air into the engine.
Tried disconnecting the cruise cable and it didn't work. Got my little home made smoker kind of working. Although i'm guessing i need to block the air inlet on the turbo and put the oil cap on? I noticed smoke coming out of the air filter and air breather on my oil cap. I didn't see anything else. Hooked up the smoker to one of the vacuum lines.
Guess i can remove the IAC again and try to clean out the hole. Do i use a special cleaner to clean the hole? When i removed it the first time there didnt seem to be much room to do anything.
Guess i can remove the IAC again and try to clean out the hole. Do i use a special cleaner to clean the hole? When i removed it the first time there didnt seem to be much room to do anything.
Thnx! will try that next.
TurboTnZ06
Go on red!
- Joined
- May 7, 2002
Yep, problem is i can't get the IAC to past the first step of the reseting procedure. Its always stuck at zero. Gonna trying cleaning out the IAC. Got my notice to smog this thing next month and just recently started having problems. Its been pretty good to me since i've owned it and never had this problem
Still no luck. Tried cleaning out the IAC with the q-tip. Used a flashlight to look inside and make sure everything was clean. Q-tips were black but once it was done i could see clearly inside the hole.
This one has really got me stumped. Should replacing the IAC do anything?
This one has really got me stumped. Should replacing the IAC do anything?
I tried cleaning out the IAC hole with a q-tip. Picked up some dirt and used a flashlight to check. Everything looked clean before putting it back in. Car still has problem with the high idle. Starts off at 175 then drop gradually to 0 as the car heats up. Could the IAC be bad? Running out of things to try before taking it to someone.
RPM's after warming up are around 1300 and the idle adjustment screw does nothing to bring it down.
RPM's after warming up are around 1300 and the idle adjustment screw does nothing to bring it down.
- Joined
- Aug 1, 2003
IAC zero and high rpm above commanded idle ... you're getting air somewhere
iac zero ...the throttle blade needs to be closed more than it is
have you verified the throttle blade closes fully , i have had a few ported throttle bodies with bent throttle blades
iac zero ...the throttle blade needs to be closed more than it is
have you verified the throttle blade closes fully , i have had a few ported throttle bodies with bent throttle blades
