Idle, timing, IAC, vacuum issues...

[FrankSG]

For those that have been following my thread about the issues I've had with high idle RPM's and not being able to set the idle, well today I've finally solved the issue with a new IAC.

As it turns out, the vacuum issue and not being able to set the idle was the result of a bad IAC. I posted several pic's of the damaged IAC, a few weeks ago and what it looked like. So today I fired up my rig and it was growling the way it's supposed too. I set the idle right at 800 RPM and the timing at 14 degree's...I treated her to high octane. Wow it's nice to have power again!;D;D

I'd really like to thank everyone here for the advice and solutions to try. I'd like to log this issue with any other possible of EFI issues that (although a bit far out) that could happen. I forgot who mentioned that the possibility of trying to set the timing without the SPOUT being pulled could have damaged the IAC. Has anyone seen this or could offer a reason that may have happened.

Thanks,
Frank

 

[xcntrk]

I believe the IAC is one of the first suspects in idle issues. Same with TPS sensors if you're not getting the proper voltage closed/open. They're cheap enough to buy new replacements you're almost better off with all new sensors.

How are you setting the Idle RPM which is controlled by the computer?

Lastly, I see no way to "damage" the IAC other than getting worn out. It's just a bypass valve if you think about it. Those rubber diaphragms can wear and let air leak by as well as the solenoid can fail resulting in slow or improper operation.