[s-cars] CPS Question

[qshipq at aol.com]

 Failing fuel pump would be my first guess.  Second would be bad ECU.  Third would be bad MAF.  CPS replaced, those should be the only items that will create a stall condition with no codes.  The only other one I had years ago, was a combination of bad 02 with a failed bypass valve.

HTH

Scott J

 


 

 

-----Original Message-----
From: racingiron at comcast.net
To: s-car-list at audifans.com
Cc: Tom Saltino <saltinot at gmail.com>
Sent: Mon, Nov 15, 2010 5:34 pm
Subject: Re: [s-cars] CPS Question


When we last left our intrepid owner (me), I had posted the below query 

suspecting the CPS for an engine quit/no restart issue. I replaced said CPS on 

the weekend and drove to work today with hope in my heart. No issues in the 

morning, but it died twice on the way home. Both times it immediately restarted. 





Same behavior as before: Engine just suddenly dies, tach drops quickly to zero 

(even though engine's still turning with the driveline), and stock boost gauge 

shows 0.2 Bar. One other time it stumbled for a second or two (but didn't die) 

and I noticed the CEL flickering rapidly, as well as the tach drop. I made it 

home and pulled the codes... as before, just 4444. 



After pulling the (empty) codes, I just left the car idling. After a few 

minutes, it quit. I still had the wires connected so I tried to pull codes 

again... Nothing, the CEL didn't illuminate at all! Turned off ignition and 

tried to restart... 0.2 Bar on the gauge and no life from the engine. Tried the 

codes again, and no CEL at all. In fact, no CEL when first turning the ignition 

on, either. 



Do these symptoms sound familiar to anyone? The boost gauge thing seems to be a 

strong indicator, but most of you don't have that so it doesn't help much. Does 

the lack of CEL mean the ECU has lost power? I think I'll pull the carpet and 

have a look in there while waiting for other suggestions. My '93 is basically a 

parts car at this point, so I can swap over suspect bits, but the last time I 

drove it I experienced some engine dying issues there, too. It's got at least 

two bum POS channels now, so I figured that was the cause. 



TIA, 

Eric R. 

'86 urq 

'92 urS 

'93 urS 



----- Original Message ----- 

From: racingiron at comcast.net 

To: s-car-list at audifans.com 

Cc: "Tom Saltino" <saltinot at gmail.com> 

Sent: Friday, October 29, 2010 6:19:18 AM 

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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