Question about 1999 GMC Suburban

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Vibration on fuel pedal of 1999 suburvan

My 1999 suburvan fuel pedal starts vibrating when the vehicle starts accelerating until the vehicle reaches 55 mph. I rotated and balanced all tires and will align the tires soon. The vibration persist

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This may be caused by bad motor mounts. Lift your hood and then start the engine. Put it in reverse and hold the brake. Push on the gas peddle and watch the engine. If it trys to roll over they may be bad. Be careful.

Posted on Dec 30, 2008

  • David Robinson Dec 31, 2008

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1 Answer

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To emininate the engine, does the vibration happen on power braking, without the vehicle moving?

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I would venture to say your exhaust is hitting your frame, or, you may need new motor mounts. The exhaust is what I would lean toward. If you can imagine your exhaust sitting under your vehicle, and the fact that the vehicle has a little age, the motor mounts probably give a little, causing the motor to move slightly on acceleration and deceleration, thus your exhaust is going to move, and may be vibrating on whatever its touching. Good luck.

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