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Discussion Starter #1
As the engine is warming up under normal load, there is a "stumble" at about 50C on the temperature gauge. By instantaneously going to about 50-75% wide-open-throttle, the engine "clears" itself and never exhibits this behavior the rest of the day. Before I begin a search of the service manual to define/fix the problem, I would like to know if others have experienced a similar problem and if fixed, how?

The car, a 1990 SEC, has an embarrassingly low mileage of less than 27K miles but has always been driven/serviced regularly.


Fred Hudspeth (aka pengineer)
1990 560SEC (original owner)
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