Mercedes-Benz 300SEL Repair and Maintenance

A guide to problems, costs, maintenance and repair for your Mercedes-Benz 300SEL

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Mercedes-Benz 300SEL Problems

Fuel system components may leak and cause hard starting problems
Leaks from the fuel pressure accumulator or a faulty cold start fuel injector (fuel system components) can cause hard starting problems.
Bad Switch/Blower Motor Resistor Assembly May Cause Inoperative Heater Blower Motor

Other than a defective motor, a bad switch or blower motor resistor assembly can cause an inoperative heater blower motor.

Rough 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.

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Mercedes-Benz 300SEL Questions

where is the fuel pump relay located at on a 1991 300SEL (1 answer)

had been running, but taking awhile to start. Then it is just turning over and will not start at all. Put some starter in breather, no firing, just turning over

No owners manual ... Does this car have a3 or 4 speed transmission? (1 answer)

What transmission is in this car 3 speed or 4 speed?

leaking EAH valve replaced valve still leaks (1 answer)

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Mercedes-Benz 300SEL Reviews

I purchased my 1991 Mercedes-Benz 300SEL in May 2014. It is great! It was owned by one previous owner who took very good care of it. I looks great, runs great and turns many heads. It's beautiful...

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