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Mercedes-Benz
420SEL
7

Incorrect Idle Speed Due to Stuck Idle Air Compensator on Mercedes-Benz 420SEL

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: 147,641 (58,000–210,000)
2 model years affected: 1990, 1991
7 people reported this problem
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