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Old 05-09-2005, 06:29 PM
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Join Date: May 2005
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racing 380

I just purchaced a 1982 380 sl and it idles at about 1800rpms. Cold or hot, it doent matter. I dont not know how long its been doing this or any history. What are some things to look at. I looked for vacuume leaks, mechanical adjustment and some other things. Any Ideas??? greg

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Old 05-09-2005, 08:29 PM
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Location: Gainesville FL
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Volume of air is the determining factor on engine speed. Your car uses a feedback controlled idle that uses the minimum engine speed to accomplish idling in various conditions.

You have too much air getting in the motor. One hint is that a dead electrical control of the idle valve leaves it full open which lets enough air into the motor to run around 1800rpms.

Idle control is a pulse width modulated control of the valve. Constant frequency, varying duty cycle. The best valiant attempt to shut the valve will look like a 70% on duty cycle.

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Continental Imports
Gainesville FL
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33 years MB technician
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