02' SL1 accelerating when braking...HELP!

Discussion in 'Saturn S-series' started by tswatkins, Oct 12, 2007.

  1. tswatkins

    tswatkins Guest

    I have a 2002 Saturn SL1, and a good 1/3 of the time when I break (whether
    on a hill or on flat road), the car accelerates up to 2,500 RPMs. It also
    happens when I am almost completely stopped, which worries me because I
    don't want to bump anyone on front of me. I am trying to find some
    answers ahead of time so I don't have to pay an arm and a leg to get my
    car evaluated at a Saturn dealer an hour away. The car has 71500miless
    approx on it, and it is mostly driven around town and occasionaly on the
    highway, and it is located in Vermont.
    tswatkins, Oct 12, 2007
  2. tswatkins

    Oppie Guest

    Examine the pedal cluster up under the dash. My guess is that when you push
    the brake, it is somehow pulling on the throttle cable.
    Oppie, Oct 12, 2007
  3. tswatkins

    BläBlä Guest

    Sounds just like a faulty Engine Coolant Temp Sensor.
    BläBlä, Oct 12, 2007
  4. tswatkins

    Oppie Guest

    One would think that if the CTS was faulty, the idle would stay high
    regardless. Is this linked with vehicle speed sensor?

    when the engine is warmed up and idling (neutral, parking brake on) what is
    the idle RPM? should be about 550.
    Oppie, Oct 12, 2007
  5. It could be the power brake booster:

    Sometimes the diaphragm tears, and it leaks vacuum when you step on the
    brake pedal.

    Refinish King, Oct 12, 2007
  6. tswatkins

    SnoMan Guest

    I think this is a good place to start.
    SnoMan, Oct 13, 2007
  7. tswatkins

    Oppie Guest

    Worth checking on. If you feel OK driving without power brakes, pinch off
    the vacuum line to the brake booster and see if you get the same behavior.

    Any major vacuum leak could conceivably cause RPM to increase. Also check
    PCV valve and charcoal canniser purge solenoid.
    Oppie, Oct 15, 2007
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