[Shotimes] Idle Changes when Depressing Clutch Pedal

[James White]

Have had similar problems with the '93mtx,but not at the same time.
Knocking occured @160k.  Replaced the knock sensor, but it seemed to make no
difference.  Fuel however did.  It knocked worse with reformulated gas
(ethanol) and very little with real premium, but it still knocked.  The only
thing that cured this was a "motor-vac" treatment, which is similar to a
Doug L. pour water into it as it is running de-carbon treatment.  Maybe it
is the gas?

It wouldn't pass emissions a couple of years later, because of a high idle.
Replaced the IAB twice. Also tried to adjust the throttle body, and then
replace it, to no avail.  Everything went to normal when I replaced the BAP
sensor.  $40 +/- @ NAPA.  Also it passed the emissions test.

Jim White - greensho@crown.net
Valparaiso, Indiana
'93  5 SPEED   276k few mods
'95  5 SPEED   235k lots of mods
"double clutch"  it's good for both you and your SHO

----- Original Message -----
From: "T Waters" <tmw5e@hotmail.com>
To: <shotimes@autox.team.net>
Sent: Monday, February 03, 2003 9:36 PM
Subject: [Shotimes] Idle Changes when Depressing Clutch Pedal


> Folks,
> It has been years since I was on the SHO list, but I have run into a very
> interesting problem with my '89.  It has begun to idle higher that normal
> (1500 rpm) and takes longer to settle down to normal idle (800 rpm) when
> coming to a complete stop, engine warm or cold.  It has a new IAC valve
and
> TPS.  Another oddity is that when I depress the clutch pedal, it idles
back
> down to 800 rpm - like taking it out of gear when coming to a stop.  This
is
> very repeatable and there is no CE light at all.
>
> Another problem is that I have spark knock, when engine warm, from 2000 to
> 3500 rpm under WOT or slightly less than WOT.  I have had the engine
> decarbonized at FPS in ATL recently to try to correct the problem, but
that
> has not.  Could it be the knock sensor?  Is there a knock sensor?
>
> Any help with these two problems would be greatly appreciated!
>
> Best regards,
> Tim Waters
> 89' Lt. Titanium
>
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