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I'm with those other guys...
Posted by Bill S. [Email] (more from Bill S.) on Tue, 13 Sep 2005 14:49:46
In Reply to: I'm w/ Mr. Frog on that assessment, RS 
[Profile/Gallery]
, Tue, 13 Sep 2005 13:08:06
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I agree with everything those guys said, but I'd like to add another vote for making sure you don't have a vacuum leak somewhere. Vacuum leaks are the bane of the turbocharged cars, especially the ones with all the plumbing associated with intercoolers. Make sure you've checked that out *very thoroughly* before you start going after other stuff.
You can use carb cleaner to find a leak by spraying it around various connections and looking for an idle speed change (though AIC can fool you and mask it). Another check: with the engine warmed up and running, open the oil filler cap -- if nothing happens you probably have a vacuum leak (you can also check by inducing a vacuum leak at one of the 5/32 hoses, etc, etc). The PCV system should be completely closed and not allow extraneous unmetered air into the system. This is an often-overlooked source of vacuum leaks. Others are the turbo bypass valve, your charcoal cannister (the small line to the throttle body), your vacuum advance unit, etc.
A vacuum leak can cause exactly the symptoms you describe: wild fluctuations at idle that go away once the O2 sensor warms up, allowing the ECU to compensate.
Good luck!
posted by 130.76.3...
Posts in this Thread:
- Another SPG question....., Jim, Tue, 13 Sep 2005 12:25:53
- Re: Another SPG question....., JimBlake
, Wed, 14 Sep 2005 07:11:31 - Thanks for all the good advice>>>>>, Jim, Tue, 13 Sep 2005 19:31:14
- I'm w/ Mr. Frog on that assessment, RS , Tue, 13 Sep 2005 13:08:06
- Re: Another SPG question....., Mr. Frog, Tue, 13 Sep 2005 12:45:41
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