steve06mcss

Noticed that while driving at a steady speed I have knock counts of 1-4. At partial and full throttle, knock counts is at 1-8. Knock retard is 0 at steady speed but throughout the power band can be anywhere from 0-1.9. Oddly enough, I also am showing anywhere from 0-7 misfires. What's odd though is there is no check engine light at all and no stored codes. Overkill 91 tune. Any ideas on this issue fellas?

lVloses

iTrader: (1)

Your engine will report misfires even though there isn't any. That's why there's a threshold that has to be met for misfires per so many revolutions to trigger the code.

steve06mcss

What worries me more I'd the knock counts, I know it's not enough for a CEL but it feels like I'm losing power at WOT. How do I get rid of these knock counts? Any ideas?

rottonj

iTrader: (4)

Can you get higher than 91 octane where you are?

steve06mcss

90% of the time I run 93 octane. I'm starting to think that this is a false knock count. But I don't wanna believe it's false cause I feel a slight loss in power .

lVloses

iTrader: (1)

Well knock wether it be actual or false will still pull timing and that's why you feel it losing power.

steve06mcss

Any way to correct it without a retune? Overkill takes too long. Still waiting on an email from 2 months ago. Haha.

lVloses

iTrader: (1)

Desensitizing the knock sensors is the only way if it actually is false knock. But that requires a modification to your tune.

steve06mcss

OK thanks, what about finding out if it is a true knock or not? I appreciate all the help.

lVloses

iTrader: (1)

If it's real knock pull enough timing where it's knocking (g/cyl vs RPM) and then it'll stop knocking.

steve06mcss

So really, the only way to fix it if it's a real knock is to pull timing at that rpm ? Damn, I need to take some sort of hptuners course or something. The local dyno shop is fantastic with LS motors, they are just expensive!