Car Problem Reports

Mercedes-Benz 300SEL Emissions Air Injection Pumps Can Seize Up and Cause Noise/Smoke

Mercedes-Benz 300SEL Problem
2 Reports
Me Too

Model Years Affected: 1990, 1991


The emissions air injection pump can seize, causing a loud squealing noise followed by smoke from the drive belt. If the engine is not turned off, the belt will break, turning on the alternator/battery warning light.

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