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Rough idle cured - Thermostat had disintegrated! (archive)
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Posted by Chris on June 10, 2001 at 15:08:13:

I finally cured the rough idle that has plagued my '97 740iL for over a month. My dealer and another independent garage could not find the problem after replacing the valve covers, the battery and alternator, and the DME.

But thanks to this forum I found out a common problem was the thermostat and waterpump. I replaced the thermostat (very easy) and although it helped at first somewhat, the problem came back.

I just replaced the waterpump and WOW, it was coming apart internally!!! I couldn't believe it even worked at all! I am going to show it to the dealer so they can help future customers with the same problem. I drove the car for about 10 miles and it has not idled roughly at all. Hopefully this is the real fix!

Thanks again to all for all of your advice!

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