I need help figuring out my knock problem on my 89 IROC. The 350 TPI engine was rebuilt to stock under a year ago. I replaced my injectors with 24# SVO injectors and changed the inj const in the chip. Other then the injectors,K&N, and the cat-back exhaust, the car is stock.

According to Craig Moates software, I'm getting alot of knock whenever the throttle is past 75%. (although I can't hear it) Doesn't matter if I floor it or accelerate slowly. I get the same amount of knock no matter what octane gas I use or if I adv, ret my timing a few degrees. I replaced the knock sensor with no change and I'm running out of ideas.

I'm grateful for any guidence provided

thanks

 

can anybody help?