Hyundai-tech: after changing cam shaft sensor, car kicks back before stopping

Discussion in 'General Motoring' started by sonata, Oct 4, 2006.

  1. sonata

    sonata Guest


    I have Sonata 99 GLS (V6) and recently replaced cam shaft sensor at a
    Hyundai-dealer in Cleveland.

    I am having a strange thing. It does not happen all the times.

    Sometimes, the engine revs up all of sudden (about 200 rpm more) and
    the increased RPM does not settle down.
    When this happens, the car kicks back right before stopping. It's like
    a hiccup or slamming brake pedal hard (of course I didn't slam the
    brake pedal).

    The only way to make it go is to turn the engine off. On restarting
    the engine, the car runs good.

    I've made appointment with the service as they have warranty back up on
    their service.

    However, I want to know what is really going on here.

    Is the newly installed cam shaft sensor mal-functioning?

    I have replaced the timing belt about six months ago. If the timing
    belt is off by a tooth or two and causing this problem, it should
    happen all the times, I guess.

    Any suggestions or explanations on this issue is highly appreciated. I
    want to fix this problem.

    sonata, Oct 4, 2006
  2. sonata

    hyundaitech Guest

    It sounds like there a throttle position sensor issue. If it's reading too
    high, the car won't idle down, and the transmission will shift hard when
    coming to a stop because the TCM thinks you've got your foot on the gas.
    hyundaitech, Oct 4, 2006
  3. sonata

    sonata Guest

    There is no check engine sign on. If it is a throttle position sensor
    issue, do I need to replace the sensor? Or, is it just matter of
    setting the throttle sensor?
    sonata, Oct 4, 2006
  4. sonata

    hyundaitech Guest

    After looking in the shop manual, it appears this sensor is adjustable, so
    it's possible it's an adjustment issue.

    Ideally, when the car isn't idling correctly, you'd check the throttle
    position sensor (TPS) reading. Unfortunately, a scan tool is the easiest
    way to do this. The scan tool reports a data value of on or off for the
    idle state. If you've got your foot of the gas and the idle switch
    reading is anything but "on," then the TPS reading is the issue.

    Then you'll need to figure out what the issue with the TPS reading is.
    Make sure there is slack in the throttle cable. It's possible it's an
    adjustment issue, but I really think neither of the above are likely to be
    the cause just because you say the problem is intermittent. I suspect the
    throttle sensor itself is defective or there's poor contact in the
    throttle position sensor connector.
    hyundaitech, Oct 4, 2006
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