Mercedes-Benz 300E Repair and Maintenance

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

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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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Mercedes-Benz 300E Questions

Low beams not working? (1 answer)

how to clean cruise control unit (1 answer)

cruise control wont maintain speed

What might cause stalling while idling ? (1 answer)

Starts with some delay initially and has stalled on highway when traffic ls moving slowly or at a stop and go condition

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Mercedes-Benz 300E Reviews

I own a Mercedes Benz 300e that I bought for my wife for $1700. At that point it had 249,000 miles on it. Before we owned it, it had been sitting for some years and had a acceleration delay issue. Once we got it back on the road I added fuel injector cleaner and drove it hard on the highway. Now the issue only appears before its fully warmed up to operating temperature. She did not want it bac...
I have this Mercedes-Benz 1990 3000E all of sudden out of no were, the car was on park went to put in reverse the park car would not move! Had no signs of tranny problems at all! No leaks at all! car runs awesome until this! mileage is 168000! What could this be?
I've had my 92' 300E with the 3 liter engine for close to 15 years now and it now has 248,000 miles on it. I’ve only had the standard repairs to perform for a car of this age (radiator, alternator, belts) all self repaired/replaced. The only small annoyance is the need to add oil, about 2 quarts/month, but I've accepted it. The car still runs strong and rides well. It’s getting close to time fo...

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