Thread: Cure knock on deceleration?

For some reason, and I'm hoping that one of the more experienced tuners can help, I'm getting knock (bad enough to cause a red flag) when I back off from light / medium throttle.

All at the same load and revs, about 64 at around 2,000-2,400RPM.

Any ideas would be greatly appreciated.

I would venture to guess that this is false knock caused by something on your engine.

For example, a loose exhaust bolt/hanger or anything like that can cause these types of symptoms.

I would take the knock sensor readings with a grain of salt, especially when picking up noise when backing out of the throttle.