The engine wiring can degrade because the insulating material falls off leaving the bare wire exposed. This can cause many problems depending on which wires are exposed and what they touch.
Resources for the Repair and Maintenance of your 1990 Mercedes-Benz 300CE
1990 Mercedes-Benz 300CE
1990 Mercedes-Benz 300CE Problems
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.
Internal and External engine oil & coolant leaks can develop from the head gasket and/or timing cover gasket; these leaks should be repaired before the engine oil and coolant intermix which can result in severe engine damage.
The seat springs and padding break down over time, causing a lean, tilt, or sag.
The electronic throttle assembly may suffer an electrical failure. It is often cheaper to send the valve to a service center for repair that to purchase a new part.
1990 Mercedes-Benz 300CE Questions and Answers
Why does my car gear down while driving down the road? It almost stops, then takes off again, doesn't know what gear it needs to be in.
Will a defective MAS unit cause my 1990 Mercedes 300CE to gear down when going down the road? If so, where can I find one?
when heater and air conditioning comes on no fan, sometimes in long trips fans come on but for short times ?
have a 1989 300ce mercedes..the left side front suspension is lower than the right.. don't have much history of car..the left tire rubs inside the wheel well when turning hard right. when i ja...