Tech / General EngineIs your car making a strange sound or won't start? Thinking of adding power with a new combination? Need other technical information or engine specific advice? Don't see another board for your problem? Post it here!
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I got an 86 iroc with tpi and i didn't know anything about these cars when i bought it, boy am i learning a lot quickly. Well my idle when i got it was nearly 2500 in park. I know there's no way thats right. so i turned it down but about the lowest i can get it is right around 2000 rpm. So thats still to high right, or is it? I dunno. It drops down to about 1500 when i put it in drive, but is this right? Let me know what u think maybe I'm not far off but i have no past with third gen camaro's so i'm not so sure.
Thanks, the new guy.
See teh label on the underside of the hood. IIRC it has the curb idle speed. If the IAC is still good and the throttle isnt hanging then youll need to re-adjust the min idle speed to where it was stock. Whatever the min idle speed is, it must be less then the curb idle speed for your car or the computer wont have any control over the idle.
Are you sure that your tachometer is correct? It's a common problem on 3rd gens to have the stock tach read too high (like mine). Is there any way you can hook up an aftermarket tach or get someone to hook up a scan tool to confirm if the stoch tach is right?
Also, does the idle ever drop down below 2000 RPM (say after driving for 5 minutes and letting it sit)?
Hey thanks guys but like i said i'm the new guy soo, i need some clarification with all this iirc or iac or whatever, how do i set it and all? I feel kinda dumb here but i don't even have a manual to go off of right now. Na i don't have ne way of testing to make sure the tach isn't messed up right now, but i'm gonna see what i can do to borrow another tach. Thanks alot, keep the help coming.
Originally posted by dimented24x7 No need to adjsut the IAC. All resets are handled automatically by the ecm upon every shut down.
The ecm can only automatically adjust so far. If the IAC was adjusted totally closed in an attempt to lower the idle due to say a vacuum leak then the ecm cannot bring it back up to where it needs to be to properly maintain an idle. PLUS, everytime you adjust the IAC you have to at least check (and adjust) the TPS.
