Question about 2002 Pontiac Grand Prix

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The car shakes really bad about 40-50 mph but when you release the gas pedal, it runs smooth, only when you hold the gas pedal down it shakes bad at around this mph. its not the tires. They are all new and balanced. possibly a clogged fuel injector? please help!

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You are apply torque to the engine upon pushing on the gas pedal so the law of nature states the engine mount maybe broken

Posted on Feb 03, 2010

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Sounds Like An Out Of Balance CV Shaft Or Shaft Not Locked Fully Into Transmission, Check That First. When Installed A Metal Ring Keeper At End Of CV Shaft Should Snap Into Transmission When Fully Inserted, Have Seen This Problem Before. Then Check Tie Rod Ends, Weight Off Of Front Tires, Move Tire Side To Side While Watching Tie Rod, If Tie Rod Is Loose & Moves Without Moving Steering Arm, Replace. My Opinion, If You Know Nothing About The Vehicle, Or Bought It Used, Replace Tie Rod Ends & Ball Joints, BOTH SIDES, If One Is Failing, The Other Side Is Probably Very Close Also.

Posted on Jul 15, 2013

  • Thor68372rockon Jul 15, 2013

    Also, Check Motor & Transmission Mounts, 1-Motor Top Side, 1-Transmission Side Top, 1-Transmission Side Underneath Car, I Think They Use What Is Called A Dog Bone For The Other Motor One & It Can Be At The Top Or Bottom Of Motor, Usually Bolts To Top Of Motor & Right Above Radiator As You Look Down, Hood Open, Or Front Of Engine Bottom Side, When You Give It Gas Your Engine Rolls To The Back Or Towards Fire Wall, It May Tweak CV Shaft Just Enough To Get It To Vibrate. Hope This Helps!



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