Asked in Car SoundsTransmissions and DrivetrainsChevy Impala1995-2005 Chevy Cavaliers
What could cause a subtle knocking noise in the engine when it's cold and only when accelerating and gets quicker the faster you accelerate?
January 20, 2008 11:23PM
I would say you either have a rod knocking or lifter knocking. I know in the 3.8 litre motors they are known to knock alittle when you cold start them. Most Grand Ams, Grand Prixs are like this. My sister has a 2002 Grand Am that does this and the noise goes away once it's warmed up. I would also double check and make sure your oil is full. get your car to a garage for a def solution.