Mercedes-Benz 300E Problems

Rough Running Engine Due to Misfire on Mercedes-Benz 300E

Problem Description and Possible Solution

A rough running motor or lack of power can be caused by a failed distributor cap or rotor, ignition wires (or their resistors), or valve cover gasket leaks. If the valve cover gasket leaks, oil can pool where the ignition wire resistor connects to the spark plug. The resistor can fail and the spark plug may not fire because of a short circuit through the oil.

(11 people reported this problem)

Mercedes-Benz 300E Vehicles With This Problem

RepairPal Verified
Average mileage: 159,650 (115,600–244,000)
4 model years affected: 1990, 1991, 1992, 1993
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Viewing 1-4 of 4 comments
rattle and run rough. hard to take off when first start to go.making noise when you press the acceleration.
please help.
2 Water pump hoses replaced and the engine runs rough now. I don't think the tensioner belt was replaced.
Engine misfired, mechanic said a tune up is needed. Just wondering whats the cost for the tune up?
Carbon connection for the coil wire appeared o.k. but had no electrical continuity. Replacement of cap fixed problem.