Power loss and white smoke
fairbanks at cmu.edu
Mon Apr 10 20:45:24 EDT 2006
I'm hoping that one of you can help me diagnose a problem I'm having.
I've got a trustworthy local mechanic but he's not a 200 expert, nor
even an Audi specialist.
A bit of history -- probably three years ago I started the car on a cool
morning and, for the first time, it put out a puff of smoke out the
back. Since then the car has had a stinky exhaust when first started
after sitting but it passes emissions just fine when warmed up. My
mechanic guessed that some oil was making its way past the turbo and
being burned off when first started. The car hasn't been using a
noticeable amount of oil. I've been getting an indicated 1.7 bar of
boost for a few years now instead of 1.8, but haven't been bothered
enough to look into fixing that.
Some of you might know this car as it's Greg Amy's old car. It's been
running without incident for the past five years here in Pittsburgh
while I'm working on my phd. It's got 193k miles on it now and I
believe Greg's had the chip in there since about 100k miles.
This past weekend I was accelerating hard (honestly, I don't do this
often as I'm stuck in Pittsburgh, the city of potholes and I have
cracked one rim here already) and heard a funny noise coincident with a
dip in power. The noise was sort of like a "grunk". When I restarted
the car about an hour later (I did let the car cool down before parking)
the car put out enough whitish smoke to really scare me.
When the smoke went away after a couple seconds, however, the car ran
fine for the rest of the day and for the return leg of my road trip (240
miles). Gas mileage on the trip was normal too, 27 mpg on the highway.
I have heard this grunk noise a couple times before but had chalked it
up to mid-grade gas when the chip requires high octane, but was only
half convinced it was premature detonation. Now I really don't think
Any ideas on what the problem could be?
Thanks in advance,
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