[Shotimes] 89 SHO Idle Issues - Help Please

[Steve Weinrich]

Welcome to the list!

First, make sure the cruise control cable has not come unhooked from the
throttle.  Mine tended to do that and would interfere with the throttle
plate returning to the closed position.

Second, try running the KOER codes as presented in the FAQs at
www.shotimes.com  See if any codes come up regarding idle speed control or
control of engine RPMs.

If so, post them and we'll see what happens.

My instinct is that the problem will be an Idle Speed Control valve fault
(or its associated electronics from the PCM).  The ISC costs about $55 from
AutoZone and is not too terribly difficult to replace.  Well, that bottom
screw is - it takes a LOT of Allen wrench repositioning.  AZ refers to it as
the "Throttle Air Bypass" valve.

Steve



----- Original Message -----
From: "Mike Kelly (Test)" <shotimes@markvii.com>
To: <shotimes@autox.team.net>
Sent: Tuesday, December 30, 2003 1:53 PM
Subject: [Shotimes] 89 SHO Idle Issues - Help Please


> Hello.
>
> This would be my first post to your prestigious list.
>
> I own a 1989 SHO that is very temperamental. I am currently having a
problem
> with the engine idle speeds.
>
> Symptoms:
>
> While engine is running, if I hold the clutch in, it typically revs
between
> 1400 and 1800 continuously every 2 seconds or so.
>
> After driving, if I put it in neutral and let out the clutch, it revs at a
> steady 2500 RPM for a full 30 seconds before revving between 1800 and 2500
> every 5 seconds or so.
>
> Sometimes (though more rarely and possibly unrelated) going around turns,
if
> the clutch is in, it revs up to 3000 RPM, until I complete the turn.
>
> I don't trust dealerships because of past pillaging, and I am not near any
of
> the recommended mechanics (Memphis, TN). Could someone please let me know
what
> could cause this, so that I know what needs to be fixed before allowing it
to
> be worked on.
>
> Thank you,
>
> Mike
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