[s-cars] CEL saga

[Ian Duff]

Might this have been a Katrina car? If so, there are prolly a bunch of corroded/rusted electrical connections. What does VAG-COM say?

Pistons full of water? How'd it get in there? While the engine was running? How's compression between the cylinders? Might the injector for cyl 1 be mucked up somehow?

-Ian.

On 04 Nov, 2010, at 09:03, Young, Steve wrote:

> 
> While this isn't s-car specific, any BTDT's could be helpful to all.  I'm looking for any ideas here from the collective knowledge bank.  TIA
> 
> First, a little background. I purchased a 1998 A6QA with an "mildly" overheated motor (so I was told) cheap thinking I could do headgaskets and get away with a running car for small money. When you're finished laughing, read on. Anyway, block was full of water and rusted, heads were toast and could not be re-surfaced. Used the block from my 1996 A6Q, and got heads from Shokan. Got the car back together and it runs well. Shortly thereafter, it threw a CEL. Pulled P0130 16514 92-00 B1S1 O2 sensor. Changed the O2 sensor with a known good used one, cleared code. CEL again, same code. Changed O2 sensor with a new one, cleared code. CEL again with code P0150 16534 92-00 B2S1 O2 sensor this time. Changed O2 sensor with a known good used one, cleared code. CEL again with
> P0130 16514 92-00 B1S1 O2 sensor
> 
> P0150 16534 92-00 B2S1 O2 sensor
> 
> P1250 17658 68-00 Fuel level too low cyl 1
> 
> At this point, I took it to a friend who is an independent mechanic. He put a code reader and two scopes on it to check the signals from the O2 sensor, and check the wiring from the O2 sensors to the ECU. Signals good, wiring good. Thinking ECU. Purchased a used ECU from Shokan. Swapped in ECU, no dice, same codes.
> 
> I can drive the car around town indefinitely without throwing a CEL. As soon as I hit the highway with sustained speeds of over 60mph, it throws a CEL. Mileage sucks, but that's due to the codes stored.
> 
> Since I couldn't drive the car when I bought it, I have no idea if this was an issue for the previous owner or something new since the engine work. I'm stumped, and looking for any ideas. Thanks.
> 
> Regards,
> 
> Steven Young, CEM, CEA
> Project Developer - Connecticut / New York / Vermont District
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