[s-cars] CPS Question

Mon Nov 15 16:20:00 PST 2010

Maybe the crank sensor?  I know no codes but that seems as likely as any. Hve you pulled the IACV to see if it's gummed up and sticky?  That's as random as this insane hiccup that's plaguing my car right now. No codes, yet obviously something's amiss.  I've driven around with the MAF unplugged, the IACV unplugged, and the 02 sensor unplugged, and the problem persists. I've replaced the fp regulator, fuel pump relay, G62 CTS, 710N bpv, run Seafoam in the fuel, and it's still there. Throttle position and engine/ambient temperature are irrelevant, as is boost pressure.  I can get a full 2.0, even 2.1 bar of boost on the stock guage, so I'm not convinced it's a boost leak, but something's cutting fuel or spark for a split second and it's driving me nuts. I haven't tested the WG diaphragm yet, nor pulled the PCV/EGR valve(s) but I know those are original.

Wylie Bean
TheRingmeister at triad.rr.com
90 cq
91 90q20v
92 UrS4
08 Q7 3.6
via BlackBerry®

-----Original Message-----
From: racingiron at comcast.net
Sender: s-car-list-bounces at audifans.com
Date: Mon, 15 Nov 2010 23:34:16 
To: <s-car-list at audifans.com>
Cc: Tom Saltino<saltinot at gmail.com>
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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