gc in 97 grand am 3.1L loud knocking

Messages
13
Location
kansas
I had a slight knock when cold and a little at idle sometimes but only noticable with the hood open. Well i tried gc to see if that would help at all but instead it made things worse. Now i can hear the knocking when im at a stoplight, it almost sounds like a diesel. Im guessing i need to go to a lighter weight oil, I was using 10w30 M1.
 

Patman

Staff member
Messages
22,003
Location
Guelph, Ontario
Oil won't help that piston slap. I bought a 94 Grand Am GT brand new in 94, with the 3.1 and actually traded the car in the next year on a new 95 Trans Am well before my lease was up, because I couldn't stand that nasty piston slap! Dealer said it was normal, I said, well then I don't want the car!
 
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