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buddy57's avatar
buddy57
Explorer
Dec 13, 2014

Engine accelerates when brake pedal is pressed

I have a 2003 37 foot marlin diesel pusher with a Cummins engine. It is on a freight liner frame.On a recent trip, while coming to a stop and pressing the brake my engine started to accelerate . I had to shut it off and then restart the engine. It was fine for a few more miles and a few more braking episode then it happened again. Very scary! We have disconnected the exhaust brake and it still does it. Cruise control is also off.Our mechanic can't seem to figure it out. Anyone have similar problem or can set me in the right direction. I don't feel safe driving
Class A
  • WayneLee's avatar
    WayneLee
    Explorer
    Dec 13, 2014
    Ditto Johno02's description. I find that the spacing on my DP between the brake pedal and the accelerator is quite different than on my cars, gas powered trucks, etc. As a result, when I move my foot from the accelerator to the brake, the edge of my shoe occasionally will remain in contact with the accelerator with the result that you describe. It has happened to me so often that when I feel it start, I quickly adjust my foot to stop the problem.
  • ScottG's avatar
    ScottG
    Nomad
    Dec 13, 2014
    A similar thing happens sometimes in Dodge trucks.
    It happens when a torque converter is not unlocking. When that happens and the computer senses the eng is dropping below specified RPM's, it adds fuel to the eng to keep the revs up. Since the eng is still mechanically coupled to the trans it tries to accelerate.
  • Johno02's avatar
    Johno02
    Explorer
    Dec 13, 2014
    I know its silly, but check your shoes. Certain ones of my shoes will hang the edge of the accelerator pedal when steping on the brake pedal.

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