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300E

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Crank but not start

Thanks for writing in about your 1990 Mercedes Benz E300. It sounds like the idle valve (https://www.yourmechanic.com/services/idle-control-valve-replacement) may be stuck closed and this could be why the engine only starts when the gas pedal is pressed. Due to the pressures...

Car wont start ive changed rotor distcap plugs wires fuel pumps csps rear.

Well, You've hit on many of the common failure items except one. Your car has a large fuel pump relay that is prone to failure and is usually the first thing I look at on the old 124 body cars...

almost no acceleration when cold need very light touch on gas idles fine motor does seem to rev up without a load was told t

Your car uses the KE injection system which is unique in that the electrical system can fail, and the injection system will still operate and keep the car running. Only problem is, you don't have any fine fuel trim like...

Backfires on start up

Backfiring can be caused by a number of faults. If the ignition timing is incorrect either by the distributor being out of alignment or a jumped timing chain, backfires can occur. Also, if ignition wires are crossed / incorrect firing...

Headlights and taillights don't work

Hello. If both of these stopped working at the same time it is usually the switch. This is the most common failure on this car. I would usually check the wiring to the switch for voltage first before replacing the...

Car electrical issues

The dash light may need to be replaced again. The light would need to be checked for a bad socket. The sunroof will need tested to see if the track is binding. The issue with your radio only working if...

My car won't rev or accelerate

Hello there. If you press down on your accelerator pedal and the engine will not rev at all, this is typically the indication of a damaged throttle linkage or throttle body component. On an older Mercedes-Benz, the throttle is not...

I put in regular unleadead by mistake my car takes premium

Your vehicle will start and run well on both regular and premium fuel unleaded. Premium fuel is stated as "required" by Mercedes Benz simply because premium will maximize the performance, fuel economy, and possibly service life of the engine. But,...

Heater and air conditioning fan stuck on low

The push button panel for your climate control is also the control unit. It uses the signals from various temp sensors to decide what to tell the climate control what to do. It also decides on the fan speed and...

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