1990 Dodge Grand Caravan Cruise Control very aggressive

Discussion in 'General Motoring' started by newsgroups, Jan 22, 2005.

  1. newsgroups

    newsgroups Guest

    I've got a 1990 Dodge Grand Caravan with the 3.3L V6 engine. The
    cruise control has always been very aggressive on this van - if it
    starts loosing any speed at all, it will downshift and practically
    floor the gas. Every other car I've driven has been much more gentle
    about accelerating and will wait a bit before downshifting.
    This van has always been like this, but I'm wondering if there is any
    adjustment I can use so it doesn't slam on the gas quite so hard.
    Eric Kotz
    newsgroups, Jan 22, 2005
  2. Usual cause of this behavior is binding or maladjusted cruise
    servo-to-throttle cable.

    Daniel J. Stern, Jan 22, 2005
  3. newsgroups

    maxpower Guest

    If the vehicle operator **repeatedly** presses and releases the SET button
    with their foot off of the accelerator (a "lift foot set" to begin speed
    control operation), the vehicle may accelerate and exceed the desired set
    speed by up to 5 MPH (8 km/h) and then decelerate to less than the desired
    set speed before finally achieving the desired set speed.

    The speed control has an adaptive strategy (ability to learn) that
    compensates for vehicle-to-vehicle variations in speed control cable
    lengths. When the speed control is set with the vehicle operators foot off
    of the accelerator pedal, the speed control "thinks" there is excessive
    speed control cable slack and adapts (learns). If "lift foot sets" are
    continually used, the speed control overshoot/undershoot condition will

    To "unlearn" the overshoot/undershoot condition, the vehicle operator has to
    press and release the SET button while maintaining the desired set speed
    with the accelerator pedal (not decelerating or accelerating), and then turn
    the speed control switch to the OFF position **(or press the CANCEL button,
    if equipped) after the speed control has been engaged for 10 seconds or
    longer.** This procedure must be performed approximately 10-15 times to
    completely unlearn the overshoot/undershoot condition.
    maxpower, Jan 22, 2005
  4. newsgroups

    Matt Whiting Guest

    My 96 and 03 vans are the same way. They downshift with very little
    added throttle. It isn't just the cruise control, it is the
    engine/transmission control programming. The cruise doesn't make it
    downshift any faster than your foot pressing the throttle.

    Matt Whiting, Jan 23, 2005
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