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Showing results for tags 'adaptation'.
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I have a 1999 US spec C2 Coupe with a Tiptronic. I bought the car 2 years ago with 60k miles on it, and recently turned 103k miles. I've had to fix the various oddities of this model, but as of yet i have no oil leaks and the car has run great until today. While crusing on the interstate I felt a "thud" from the rear of the car, and the engine lost power. I was able to coast down an exit ramp and onto a side road where the AAA flatbed would soon pick me up. When I turned the key I could hear the starter motor running (fast) but there was no apparent engagement with the flywheel. There are no fluids dripping onto the ground that i've seen with other massive failures. When I get home from work i'll hookup the Durametric and see if there are any interesting codes, but for now i'm trying to determine what the next steps should be. So here are a couple of other pieces of information. About a week ago as i was leaving for work in the morning i heard a "whirling" or "spinning" sound coming from the back -- moderately slow in frequency, and only when the car was deaccelerating. The sound was almost like a fan blade hitting a plastic shroud every rotation - but with a bit more of a differential-whine to it. When the car was up to operating temperature the noise would go away. Others on the forum have described this noise with the suggestion that it is a wheel bearing - but i was able to convince myself that it wasn't a wheel bearing by putting the tran in neutral while the car was rolling. The noise was controllable by engine speed - not by road speed, which seemed to point more towards engine/tran than wheel bearling. I drove the car for the next 3 days and noticed that the noise was about the same - and always went away when the engine was up to operating temp.. I hooked up my Durametric and found no error codes. I reset the adaptations to see what effect that would have on the Tip. The next morning the car started rough but within 30 seconds was purring smooth. I assumed that the adaptation reset was the cause of this. Best yet -- the whirling noise was no longer happening. As a side note - my fuel mileage improved by 1 mph after the adaptation reset - but that could be just dumb luck. So back to this morning -- "thud" on the highway, and a tow-truck. I haven't started digging into my shop manuals yet -- but i'm assuming that i've had a failure in the Tip - maybe the torque converter? The older German cars that i have have been manual gear boxes -- a clutch failure wouldn't necessarily prevent me from starting the engine - but i'm not familiar with the automatics. This sound familiar to anyone? Thanks in advance -- this forum rocks, and the last 40k miles on this car have been a blast - in part because of all of the good information this forum offers.