My 1981 380SL developed a problem recently, where when idling and in
park, the idle revs jump from 700 to about 1200 for a few moments and
then back down. What should I look for in fixing this? Is it dangerous?
The idle speed motor on top of the front of the engine is controlled by a
computer mounted in the right kick panel. Take this box out open it and
resolder the connections to the pinout. Less likely- poor connection at the
425 White Horse Pike
I've had similar problems on other vehicles which may or may not
apply to your 380SL. On most cars that have power steering, if the
pressure in the system gets too low, the idle speed will be increased.
Idle speed is also increased when the A/C compressor is running. A fault
here could be causing the problem.
When I had this problem with my Jeep Cherokee, yes, it was dangerous!
Often, while parking, the engine RPM's would suddenly jump causing
the car to lurch. Scared the s**t out of my wife a couple of times.
Doesn't apply, we're talking Mercedes here no guess work on this problem, Bill
Ditmire got it right the first time, Idle speed control unit, 380SL = R107,
idle speed control unit located behind the glove box.
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