[s-cars] Cold Engine Stop-Light Stalling

[Cody Payne]

Ok..just checked the ISV function..seems to be very smooth moving on the output tests..no sticking or hesitation either on the ISV.  We also just pressurized the entire intake system with about 15-20 PSI and plugged the Breather on the valve cover.  We also just changed the O2 sensor again to see if the Borg-Warner sensor is faulty for some reason.  Finally we checked for any DTC's and there were none.  I will know in the AM if the O2 sensor is the culprit.

cp

-----Original Message-----
From: Michael Wakefield [mailto:mwake at rmi.net]
Sent: Friday, October 24, 2003 11:56 AM
To: Cody Payne
Cc: 'S-Car-List (E-mail)
Subject: Re: [s-cars] Cold Engine Stop-Light Stalling


I had the same symptoms on my 93s4, so I squirted some WD40 into the
ISV, and it's OK now. I had the problem once on my Delorean, and the
ISV is similar, but was in really bad shape. I squirted in WD40, then
cycled the valve with 12V many times until it smoothed out. It fixed it.
Mike Wakefield

On Friday, October 24, 2003, at 08:57 AM, Cody Payne wrote:

> S-Car Gods,
> 	Gents...ok..the gremlins continue to haunt me on this stalling issue
> when the engine is cold. I have changed my O2 Sensor, Spark Plugs
> (Bosch FDPOR), cleaned ISV and confirmed works w/ OutPut Tests.  But
> my car stalled again this AM coming to my 1st stoplight on the way to
> work about 1 min from home.  It nearly stalled again at the 2nd
> stoplight which is another 1.5 min or so from the 1st but I was able
> to heal and toe her to keep it running.  But once the car got warmed
> up on the highway it seemed to be ok.  Still seems I have a bit of
> sporadic idle when cold too...sort of bounces around 1.2K then settles
> down to 750-800.  Other then the stalling problem car is running very
> strong.  The only other thing I changed and have not changed back is
> my Stiffer WG spring?
>
> Vacuum leak? ISV bad? Fuel Pump? (It is only 1 year old) Fuel Filter?
> (Only 5K Old)
>
> Thx
>
> cp
>
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