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.
Rough Running Engine Due to Misfire on Mercedes-Benz 300E
Average mileage: 159,650 (115,600–244,000)
9 people reported this problem
1992 Mercedes-Benz 300E 244,000 mi, Visitor
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.
Carbon connection for the coil wire appeared o.k. but had no electrical continuity. Replacement of cap fixed problem.
1993 Mercedes-Benz 300E 115,600 mi, Visitor
Engine misfired, mechanic said a tune up is needed. Just wondering whats the cost for the tune up?