Another high idle problem... tried everything. - TCCoA Forums
 
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post #1 of 4 (permalink) Old 04-23-2007, 05:09 PM Thread Starter
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Another high idle problem... tried everything.

I searched the forums too. This was originally my roomates car, he could not figure out the problem, I bought it from him for cheap so I could have a car to drive while I build my mustang. Here's the skinny....

Car idles around 2k, headers get glowing hot. Only codes that came up were running lean, which I am thinking is either actually lean because of a vacuum leak, or possibly clogged cats. Roomate replaced the IAC, didn't fix it. A "mechanic" told him his thottle body was warped, so he got a used one and put it on there with the TPS that came on it and the new IAC. Still idling high. Disconnected battery and EEC fuse for an hour , still high. We sprayed brake cleaner everywhere under the hood, near all intake and TB surfaces, injectors, vacuum Ts, did not notice any change. I tried unplugging the main vacuum feed from the middle-rear of the upper intake, no change.

I can't think of anything else, I would try checking the TPS voltage but I don't know which two to probe, plus it's unlikely that the TPS on both throttle bodies would be doing the exact same thing. Any other vacuum feeds that I am missing? Thanks
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post #2 of 4 (permalink) Old 04-25-2007, 05:34 PM
 
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stating the obvious

I may be stating the obvious but if you had a vacuum leak that bad you should be able to hear it from under the hood.
Have you cleaned the mafs? or checked to make sure its good?

Last edited by mn12v6x2; 04-25-2007 at 05:44 PM.
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post #3 of 4 (permalink) Old 04-26-2007, 06:10 PM Thread Starter
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Roomate tried cleaning it and it did not help. Even after I unplug the MAF the idle does not change.
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post #4 of 4 (permalink) Old 04-26-2007, 07:25 PM Thread Starter
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Thumbs up

IT'S FIXED! I can't believe this, the problem is the aftermarket IAC was backwards from stock. I asked the roomate about this before, but he insisted he was POSITIVE that it would only fit one way (DOH!). I realized it had to be that when I noticed that after the engine got warm it the idle went even higher...... backwards of what it is supposed to do.
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