Thread: Knock Retard when accelerating

I have the Powertuner, but have put everything except for transmission settings back to stock. I've decided that my car is mostly stock and I could see maybe having to tune out 2-3 degrees of knock, but there is no reason for 7*+ on my setup without something being wrong mechanically.

Well, intake system cleaner had no effect whatsoever.

I added 10% to everything above 6000 with PE enable mostly at 30%, and got the highest KR numbers I have ever had...12 degrees on the highway at about 85% throttle. Somehow these setting had the opposite of the desired effect.

What I can tell you from experience that the misfiring and KR is probably coming from an intake leak. On my 03 GTP it was misfiring on the number four cylinder and sure enough it was an intake leak. That's something to look at. I hope that helps you! Good luck!

Wanted to report back on my recent findings.

On a hunch, mainly from the ticking when first started, I had been off and on checking for exaust smoke at the rear of the engine but could never spot anything. I read somewhere about holding a tissue around the suspected area, I at first I didn't notice anything, until I lowered it far enough to reach the bottom of the exhaust manifold and sure enough the end of the tissue started moving with the RPMs. This, I assume, would explain the 30*+ IAT readings over ambient with the stock airbox. New exhaust manifold and gaskets are on there way. I don't know for sure right now if the gasket is bad, or if there is a crack inthe manifold, but I only want to do this once. This hopefully is the root of all my problems, but if not, it is at least the root of some of them.