When the gas is pressed down th eengine makes a grinding niose
Pontiac Q&AAsk Your Question
2007 Pontiac Grand Prix Question: why does engine make a grinding noise
Answer #1carcarecenterasa from Car Care Center ASA, Inc, February 12, 2011, 10:12Technician
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.