Lag and engine lurch when maintaining speed on level road - 2001 T&CAWD 3.8 -

Discussion in 'General Motoring' started by Luke, Apr 27, 2010.

  1. Luke

    Luke Guest


    When I'm coasting along at any speed (usually over 30) on a level
    surface and give enough throttle just to keep my speed up the engine
    lags and lurches as if its running out of gas or getting some kind of
    vapor lock. The tac bounces up and down by 500 rpms. It's as if the
    engine is going to die. If I give it more gas it accelerates
    normally. If I just coast with no gas its fine. It's just when I
    give it just enough gas to keep my speed constant. I haven't taken it
    in yet and wondered if anyone on this forum might have an idea on what
    it could be.

    Luke, Apr 27, 2010
  2. Luke

    KirkM Guest

    I had this with my 1993 Voyager. A good cleaning of the throttle body
    took care of it. Also, a cheap quality AIS motor had been installed at
    sometime too, so they replaced it.

    KirkM, Apr 28, 2010
  3. Luke

    Luke Guest

    Thanks KM
    Luke, Apr 30, 2010
  4. Luke

    Steve N. Guest

    While you're at it and cleaning the throttle body, you might want to
    disconnect the throttle position sensor connector and put an ohm meter
    across 2 of the contacts (you'll have to figure out which 2 contacts of the
    3 to measure across-it will be obvious if you play around with it and watch
    the meter readings) and work the throttle from idle to partial throttle to
    see if the resistance changes smoothly or if it's erratic in certain spots.
    When they get bad they can send wrong throttle position info to the PCM
    (computer). A new TPS is very inexpensive - about $20 at Autozone. Just a
    Steve N., Apr 30, 2010
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