1990 Mercedes-Benz 300CE Repair and Maintenance
A guide to problems, costs, maintenance and repair for your 1990 Mercedes-Benz 300CE
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1990 Mercedes-Benz 300CE ProblemsRough Running Engine Due to Misfire
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.
One or more blend door vacuum actuators may fail resulting in the incorrect output temperature from the HVAC system. Failed actuators will require replacement to restore proper HVAC operation.
Leaks may develop from the differential seals and/or cover on older or high mileage vehicles. Our technicians recommend a complete reseal of the differential unit when these leaks are addressed.
1990 Mercedes-Benz 300CE QuestionsTroubleshooting bad exhaust valve (1 answer)
Wont pass smog.
Compression check compressions are 75lbs, 135 lbs, 190lbs, 175lbs, 160lbs and 185 lbs
vehicle has a hard or no shift from 1st to 2nd when cold but will shift normal once warmed up