Indycam

sgelber , where are you located ?
What brand / grade / octane gas do you use ?

KirkF

It almost sounds like the knock detection is going off under load at those rpms?
Has your mechanic taken it for a run with the hammer attached and checked the knock numbers?

Kirk

Indycam

"knock detection is going off"
Thats where I was going with my questions .

sgelber

I am located in Santa Cruz CA. As to the knock detection, will check it out however I am sure my service guy has already done a static test on it. If I were to replace it, how much are we talking about in dollars?

Indycam

If the gas was poor and the engine knocked , then the computer retarded the ignition ....


"If I were to replace it,"
Its not a matter of replacing it .