IAC codes popping up ...
Thread Starter
Melting Slicks
Joined: Dec 2000
Posts: 2,719
Likes: 59
From: Fremont Oh
IAC codes popping up ...
I'll post this in the Nitrous and blown as well... perhaps someone can give me some assistance...
Since I added the intercooler to my car, I have been getting MIL lights coming on DTC 506 Idle system low IAC responding... DTC 507 Idle High IAC responding...
I'm hoping someone who is superchargered with LT1 edit can share if they have had the same experience... I'm due for emission here soon and it's going to be a pain let alone the risk of the light popping on...
The idle seems stable... the other issue I have is that the IAC is going to 0 at idle where most things I have read say that it should be at 25... if I adjust up the idle (throttle body) the idle just increases and I don't see a difference in the IAC. I have also cleaned and replaced the IAC... I'm running a BBK 52 mmm throttle body, and the best I can tell I have no vaccuum leaks...
Appriciate any programming suggestions i.e. the idle and iac settings in the ecm.. Anything LOL
Thanks!
mo
Since I added the intercooler to my car, I have been getting MIL lights coming on DTC 506 Idle system low IAC responding... DTC 507 Idle High IAC responding...
I'm hoping someone who is superchargered with LT1 edit can share if they have had the same experience... I'm due for emission here soon and it's going to be a pain let alone the risk of the light popping on...
The idle seems stable... the other issue I have is that the IAC is going to 0 at idle where most things I have read say that it should be at 25... if I adjust up the idle (throttle body) the idle just increases and I don't see a difference in the IAC. I have also cleaned and replaced the IAC... I'm running a BBK 52 mmm throttle body, and the best I can tell I have no vaccuum leaks...
Appriciate any programming suggestions i.e. the idle and iac settings in the ecm.. Anything LOL
Thanks!
mo
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
Re: IAC codes popping up ... (Mo_Bandy)
With an L98 a code 35 signals an idle speed problem and is set when idle speed is 300rpm above or below the desired for 50 sec; sounds like you get a code indicating which way the error occurs.
Possible causes with L98 are:
-engine running too rich or lean
-the pintel is dragging on the bore
-improper A/C clutch operation
-hunting idle
Verify that the internal resistance of the IAC coils it around 20 Ohms and that, while idling, a test light flashes when connected in turn between each IAC connector pin and ground.
When the IAC counts go to zero the ECM is calling for more air; I suspect a rich condition.
Possible causes with L98 are:
-engine running too rich or lean
-the pintel is dragging on the bore
-improper A/C clutch operation
-hunting idle
Verify that the internal resistance of the IAC coils it around 20 Ohms and that, while idling, a test light flashes when connected in turn between each IAC connector pin and ground.
When the IAC counts go to zero the ECM is calling for more air; I suspect a rich condition.
