Question about 2004 GMC Envoy

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I am hearing a high pitch whinning noise under the car when you push on the gas. Not sure if a possible leak from exhaust or catalytic converter. Car has approximately 82000 miles and has never encounter any major problems.

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  • p_g_sprinkle Apr 24, 2010

    I am hearing a high pitch whinning noise under the car when you push on the gas. Not sure if a possible leak from exhaust or catalytic converter. Car has approximately 82000 miles and has never encounter any major problems. I have not noticed any smoke coming from anywhere.

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Exhaust leaks are not typically a high pitch or a whine. a restricted catalytic converter can make these sounds. an exhaust backpressure test can be performed to determine this - this is done by removing the front oxygen sensor and threading in a specialized pressure gauge. more than exhaust, i would suspect a belt driven accessory bearing, ie alternator, ac compressor, etc, or pulley bearing. this can be determined by removing the built from the engine and starting it briefly. if the noise is gone, you know the problem lies in the belt area. at this point a stethescope is useful to determine which pulley is causing the problem, or, with the belt still off, spin all the pulleys and try to wiggle them to see if there is any binding, noise, or side to side movement. also, check the power steering fluid, if it is low it can cause a noise like this. good luck!

Posted on Apr 24, 2010

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Its deffinitely a leak from the exhaust,, unless is your getting black smoke then its the convertor..

to fix u need a ramp and a gas welding plan,, and brass rods

1.) place car on ramp..
start vehicle and rev
2.) you will notice a place on the exhaust that smoke escapes from,, thats the hole
3.) brass weld it shut..

Posted on Apr 23, 2010

  • Rishi Roshan Ali Apr 24, 2010

    are you certain it aint coming from one of the belts ?? or steering pully,, bt belts i mean,, ac belt and alternator belt..

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