[Shotimes] Re: High Idle

[Leigh Smith]

George;
As I was driving home tonite, I had a profound thought (don't laugh). I 
think my surging idle pretty well stopped after I put on a new A/C 
compressor this summer. The old one was slowly seizing up, even though 
it worked well until the day it popped a seal.
Ah gee, it only lasted 235k miles!!
How old is yours?

Lee

George Fourchy wrote:
> On Wed, 23 Oct 2002 17:19:24 -0400, Leigh Smith wrote:
> 
> 
>>Think the surging could be O2 sensors?
> 
> 
> I wouldn't think so, at least they wouldn't be the very next choice.  Usually surging is
> the result of uneven air/fuel mixtures.  If it isn't the IAB, I'd try for a vacuum leak. 
> Maybe the line that runs the butterflies, or maybe the one to the dash mounted plastic
> tree.  Try disconnecting the line that goes to that tree from the manifold, and see if it
> runs better.   Disconnect every vacuum line from the intake and run it, but do them one
> at a time, to help isolate the bad one.
> 
> What happens when you disconnect the IAB connector?  Does it go way down in idle speed,
> almost dying?  (It should.)  If so, can you raise the idle back up with the throttle so
> that it will idle steady with the throttle open a little bit?  If it does, this would
> indicate the IAB gasket might have a leak....not particularly likely, with the machining
> on the IAB passages and that very thin gasket, but it is another test you can try.
> 
> George
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