[Shotimes] Re: High Idle

[Jim and Debbie Leyden]

Lee,
I think you are right...
I just took a 2000 mile trip in my '93 and noticed the same thing.  It would
idle from 900-1200 rpm.  When I turned off the A/C it smoothed right out.

Jim
218,000



-----Original Message-----
From: shotimes-admin@autox.team.net
[mailto:shotimes-admin@autox.team.net]On Behalf Of Leigh Smith
Sent: Wednesday, October 23, 2002 9:57 PM
To: George Fourchy
Cc: shotimes@autox.team.net
Subject: Re: [Shotimes] Re: High Idle


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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