View Full Version : Subtle, yet detectable engine knock on shutdown

08-30-09, 12:43 PM
Anybody experience or hear a subtle engine knock at shutdown? :thepan:

08-30-09, 04:55 PM
This might be a normal occurrence with a monster pushrod motor, bad gas or a PCM tuning issue. I'll swing by my dealers.

Gary Wells
08-30-09, 05:31 PM
If there is any question about the >gas< quality or octane level causing your knock, I would throw in a little 100 octane unleaded along with whatever is in your tank now just to raise the octane level enough to remove the gas quality or octane level question out of the equation. Then off to the dealers if it doesn't remove or improve the knock. Just the rambling thoughts of a senile old man. HTH

08-31-09, 09:09 AM
I get it too. It's not a piston knock, it's that damn supercharger. The sound is a very noticeable marble can sound.

08-31-09, 09:38 AM
...its either the cam or that stupid ass supercharger isolater spring or whatever....turn your car on in the morning and open your hood. If you hear this noise like a bouncing marble than its that dumb spring issue....