1990 Mercedes-Benz 300SEL Repair and Maintenance
A guide to problems, costs, maintenance and repair for your 1990 Mercedes-Benz 300SEL
Verified by mechanics, reported by drivers like you
Ask a mechanic in our community
Never overpay. Check prices with our estimator
1990 Mercedes-Benz 300SEL ProblemsFuel system components may leak and cause hard starting problems
Other than a defective motor, a bad switch or blower motor resistor assembly can cause an inoperative heater blower motor.
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.
1990 Mercedes-Benz 300SEL QuestionsNo owners manual ... Does this car have a3 or 4 speed transmission? (1 answer)
What transmission is in this car 3 speed or 4 speed?
And if so is it better to buy a brand new one or is getting a rebuilt one just as good thanks and I look forward to my answer