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Q:

why does engine make a grinding noise on 2007 Pontiac Grand Prix

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
When the gas is pressed down th eengine makes a grinding niose
(1) Answer
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Your engine mounts may be broken. Without functioning engine mounts, the engine will rest onto the frame of the vehicle causing the grinding noise whenever you accelerate because of the engine shaking around on the frame.