Incorrect Idle Speed Due to Stuck Idle Air Compensator on Mercedes-Benz 560SEL

It is not uncommon for the idle air compensator to get stuck in one position, resulting in the engine idle speed (rpm) being too high or too low. Replacement of the failed compensator may be necessary to correct this concern.

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Average mileage: 100,000 (100,000–100,000)
2 model years affected: 1990, 1991
3 people reported this problem
1 person shared problem details
I have a 1990 Mercedes 560sel When I start it up in the morning it idles at about 800 but as soon as it warms up it will idle at 1100rpm in park or neutral What wrong with it? Luke
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