[s-cars] CPS Question

Bares, Vittorio Vittorio.Bares at nuance.com
Fri Oct 29 03:26:42 PDT 2010


Cam Position Sensor is only used by the cpu at startup to determine if
the engine is in the compression or exhaust stroke. Once the car is
running you can unplug the CPS and the car will continue to run.

Vittorio -

-----Original Message-----
From: s-car-list-bounces at audifans.com
[mailto:s-car-list-bounces at audifans.com] On Behalf Of
racingiron at comcast.net
Sent: Friday, October 29, 2010 6:19 AM
To: s-car-list at audifans.com
Cc: Tom Saltino
Subject: [s-cars] CPS Question

I've had a few incidents of my '92 just shutting down on me while
driving recently. The engine just cuts out completely, and the tach
falls to zero even while the car is still coasting in gear. All
electronic accessories remain powered, and the starter engages, but no
immediate restart. After sitting for a period of time, it just fires up
and runs fine. I verified fuel pump operation and no fault codes. I'm
thinking CPS at this point. One weird thing I noticed during last
night's episode. The stock boost gauge, which normally shows 1.0 BAR
with key on before starting the engine, was showing 0.2 BAR when the car
was refusing to restart. I eventually had the car towed home, and while
rolling the car off the truck, I noticed that the boost gauge was back
to 1.0 when I turned the key. Actually, it started at 1.0, gradually
dropped to 0.2, then went back up to 1.0. I hit the starter, it fired
up, and I drove off the truck. [sigh] Anybody know if this boost gauge
behavior points to the CPS of is an indicator of something else? 

TIA, 
Eric R. 
'86 urq 
'92 urS 
'93 urS 
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