Question about 1997 Mercedes-Benz C-Class

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1997 mercedes benz E320 acceleration problem

My car starts and idles fine but does not respond at all when I press the accelerator, even in park...I replaced the accelerator control module(under hood connected to accelerator cable) and spark plugs but that didn't help at all. I even replaced the fuel filter and checked all fuzes and found all to be good...What else could be the problem???

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  • noivaw53 Nov 29, 2008


    Thanks so much for comments...No, my check engine light is not on but I do know I have pressure at the fuel rail port. Don't have a pressure gauge to check psi...

  • noivaw53 Nov 29, 2008


    Thanks Guys for your comments...I did notice this morning that the butterfly on the throttle body is not moving in response to the TPS...Does that make the throttle body assy a more likely culprit???

  • noivaw53 Nov 30, 2008

    To all the guys that reponded with help on fixing my accelerator problem...Thanks soooooo much!!!! I really appreciate all the comments. I went to Sears and bought an Actron OBD II Scanner and reset my computer and bingo, problem fixed...Thanks so much and have a great holiday season!!! God Bless...

  • michaelgall Feb 14, 2009

    1997 E320. does not respond to accelration. idles at 1200 in gear drops to 1000. replaced battery. per OBD2 Scanner no error codes. do i need to reset some value for some reason?



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You may also have issues with your air flow meter.Generaly though this symptom is usualy a fuel pressure problem.This test may or may not work depending on wether the fuel rail is the problem or the pump.Squeeze the fuel return line at the back of the fuel rail and if engine improves the fuel pressure regulator on the fuel rail may be faulty.If no improvement its likely the pump.The best and most accurate test would be to use an inline fuel pressure tester.Can you hear the pump pumping up to pressure when you turn the ignition on?Usualy though the pumps fail but can be heard running but unable to maintain pressure.

Posted on Nov 29, 2008

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Pull fuse 19 first....
resets computer without buying scanner

Posted on Jan 23, 2012

  • aquaticx
    aquaticx Jan 23, 2012

    Had this problem after a totally dead battery .. Would not go above idle . So with the car started I pulled fuse 19 and the car died ....
    Reinserted fuse , restart and I have full power

  • RAYMOND CROSS JR Jan 03, 2013



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Hello / it sounds to me like the throtel is bad, if you accel and there is no responce and the vehicle idles fine and you replaced the other possible option that is the accel poss sensor / that works in hand with the throtel body , need to check for priceing they are kind of exp /and depends on the year you may need to replace the dme aswell .good luck

Posted on Nov 29, 2008

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Hi if your check engine light is not on you migh have cloged injectors obstructing the passage of fuel,if the light is on this can be the trottle position sensor,TPS, also check the fuel presure,,C1

Posted on Nov 29, 2008

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