Problem Reports
Mercedes-Benz 300E 4MATIC
Report: Emissions Air Injection Pumps Can Seize Up and Cause Noise/Smoke
Mercedes-Benz 300E 4MATIC Problem
4 Reports
Model Years Affected: 1990, 1991, 1992, 1993
Verified
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.