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Thread: Surging on Accel. and Decel.

  1. #1

    Lightbulb Surging on Accel. and Decel.

    Problem: On acceleration, car pulses very subtly. On deceleration it does the same thing. Occasionally, when going from D to P, idle will surge up above 10k, then gradually come down. Sometimes when this happens, ASR light goes on. Also, more troubling, when driving, the ASR and ABS light come on and acclerator peddle offers no response. In this instance, I shift to N, turn off ignition and turn on and we're back in business. No fault codes to give us a clue.

    Solution: After several incremental expendtires (brake light switch, vaccuum hoses, etc.) replaced Throttle Actuator (ouch, $$) and all is well with the world.

  2. #2
    E500E Guru 500ESpain's Avatar
    Join Date
    Jul 2009
    Madrid, Spain

    Re: Surging on Accel. and Decel.

    Nice you solved the problem.

    I've heard about the brake light switch causing trouble but I don't understand why. Anyone could explain it to me, please? And, by the way, where is the switch located? Behind the pedal?

    1971 Seat 600E, 1981 Mercedes 300TD, 1984 Mercedes 300D, 1992 Mercedes 500E, 1995 Range Rover 4.6 HSE, 2005 Audi A4 2.5TDI Avant, 2007 Triumph Bonneville


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