Spark knock...no code

[Scott Martin]

I am getting part throttle spark knock no matter what octane fuel I use in my 97 5.7. It's better with premium, but still there. I have a Black Bear Tune, and I have sent the computer back to them for a retune, but the issue is still there. I have replaced the knock sensor. Has anyone had a similar issue? I'm guessing it's either a bad EGR or a worn distributor gear, but the no CEL or code is throwing me off.

I was having this problem for the past several years and I just figured out how to make it stop... I decided to try putting some premium gas in and to my astonishment it fixed my misfire and shudder problems!

 

[superdave]

I was having this problem for the past several years and I just figured out how to make it stop... I decided to try putting some premium gas in and to my astonishment it fixed my misfire and shudder problems!

That's how I deal with mine

 

[L29Sub]

Make sure your EGR is functioning. If it's deleted, or not operating, it will cause major spark knock. You can check the dist timing with a timing light or live OBD. If the engine ran ok and suddenly started doing this, any plug wires mixed up, egr tampered with?

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