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

Problem Description and Possible Solution

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.

Problem Data
RepairPal Verified
Average mileage: 100,000 (100,000–100,000)
2 model years affected: 1990, 1991
3 people reported this problem
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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