help with a strange knock in my olds 3100 engine. Help
my 1999 3100 53K Miles has a knock that is not in sync with the engine rotation, and speeds up from idle to about 2000 rpm, then it dissapears when accelerated further. At all speeds it is not in sync with engine rotation. It also is not always there. IT will be there for 30 minutes then gone for days. I have pretty much ruled out a rod knock being it comes and goes and is not always there, and is out of sync with the engine ( much much slower than the rotation of the engine. If I could guess, I would say 1 knock per 5 revolutions give or take a few.
1999 Oldsmobile Culttlass GLS
SOLD - 1994 Bonneville w/198,000 miles
BC Member 4 Life, or at least until banned