valves are knocking with new tune.

[Teddy GreeneII]

Took her out today and am having what to me sounds like the valves knocking. Less so than yesterday so Im hoping its learning. a little worried, if it doesnt subside soon Im gonna put it back to stock until I can find out whats going on. She is driving a little bit better though, I think Waynes right, even with the tuner it still needs to learn everything.

 

[Rodger Tellefson]

Just in case you didn't think of it: Did you disconnect the battery for 1/2 hr. after flashing?

 

[Teddy GreeneII]

Wayne brought that up, cant believe I didnt think of that. I know the intake isnt acting like it should and the valves somehow are acting up. I dont see how either of those are possible from a tune, but I have disconected it and will take it out again. Thanks Rodger.

 

[Bill Ellis]

What do you mean when you say "Intake isn't acting like it should". The intake just sits there. It doesn't do anything. It's a pipe with a filter on the end. Air flows through it where flow volume is a function of throttle position. What do you mean by the "valves acting up". A knocking noise in the 4.0L V6 is often a timing chain problem in the pre '03 engines. Is that what you are hearing? Did you flash you CPU with a performance program and forget to change to a higher octane fuel?