Question about 1995 Mercedes-Benz E-Class

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Engine started to shake and rumble when u start it and in idle

Check engine light came out. I also noticed that rpms in idle very low- 500 and it changing between 500 and 800 in a wave like way together with the oil level. If u press a gas pedal in neutral or in park and increase rpms to 1000 the shaking goes away. there is also no shaking while driving but the car jerks between stop and untill 20 mph.
I changed spark plugs but it didnt help. Anyone know what could be the reason?
car in Mercedes benz 1995, E320

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  • Ned C Cook
    Ned C Cook May 28, 2010

    It seems you may have a severe misfire situation. Guel injected? Could be an injector. Could be a bad plug wire. These should be chked Does it smoke at the tailpipe?

  • Anonymous Mar 31, 2014

    Car won't go over 1000 rpms shakes and will not go over 15 to 20 mph

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I think you right in your thinking by replacing the plugs. My guess is that an injector is partially blocked. Remove the fuel pump relay and take the vacuum hose of the pressure regulator on the end of the fuel rail. Try to start the engine to relieve pressure from the system. Remove the air cleaner ducting. Open the fuel filler cap for a second to relieve any pressure in the tank. Disconnect the fuel supply and fuel return pipes to the fuel rail. Unbolt the fuel rail mount, disconnect the injector electrical connections and ease the injectors out. Take care with the wiring some of the insulation can become brittle. The injectors are held in the intake manifold by 'O' rings and likewise to the fuel rail; securing clips ensure that the injectors are held securely to the rail. Wash and back flush these babies until you are happy they are clean and free of obstruction. Also check the fuel pressure regulator, it is rare for these to fail but its worth checking. Dry everything off. Apply a little oil to the 'O' rings prior to reassembly. If the problem persists at least you can cross this area off your list.

Posted on May 28, 2010

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