Knock On Deceleration?

[Jas89TTA]

Today I noticed on my scanmaster it was regeristing knock when I was not on the gas pedal, It was jumping around for a few seconds and then went away it was anywhere from 1/2 to 10.5
What could cause this? Should I be worried? Now when I would accel with boost the most It read was 2deg and went away and that was on a 20psi boost with alky. Any info on what it could be would be great. Right now I scared to drive it. Thanks, Jason

 

[Razor]

Knock on decel is more than likely false knock. Like downpipe hitting frame, etc..

Knock you worry about is at boost levels above 15 PSI that doesnt go away after a few frames.

Could be internal engine like timing chain. But not inside the cylinders.

HTH