1991 Mercedes-Benz 300E Repair and Maintenance

A guide to problems, costs, maintenance and repair for your 1991 Mercedes-Benz 300E

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1991 Mercedes-Benz 300E Problems

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.

Failure of EHA valve may cause fuel/engine problems
Fuel leaks, erratic or rough engine operation, and fuel economy issues can be caused by the failure of a fuel system component called the EHA (electro-hydraulic actuator) valve.
Improper Temperature Output From HVAC

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.

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1991 Mercedes-Benz 300E Questions

how to clean cruise control unit (1 answer)

cruise control wont maintain speed

need to know the location of the OBD connection port for my 91 300E Mercedes (2 answers)

I smell gas after I start my engine & when I shut the engine off (1 answer)

my 91 300E seems to run good. I am concerned about the smell of gas . I am due for smog before Mar 8 this year. I am thinking maybe a clogged fuel filter or maybe a new one? I am not to keen when it comes to anything under the hood. I am female and just turned sixty so I could sure use a little h...

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1991 Mercedes-Benz 300E Reviews

My dad gave me the keys to his 1991 300E, in 2008. He's retired now, and I think he got tired of maintaining it. I've spent several thousands to keep it on the road. I don't regret a dime I've spent. The exterior and interior condition is in great condition. It has a slight oil leak, which I've decided to leave it alone. My trusty German motor mechanic fixed the problem twice in the last 2 year...

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