RFF

I have done two WOT runs where the scanmaster has recorded a knock retard of 10 and 12 degrees. Other times whenever I take off from a stop the scanmaster starts to read a knock retard under very light throttle conditions and it goes up as I give the car more throttle (0.1 to about 1.8 degrees of retard). The odd thing is that some days the scanmaster will record 0 knock retard even under WOT. At first I thought it may be because the engine might be running to cold (160 T-Stat) but I know for a fact when the scanmaster recorded the 10 degrees of retard at WOT my LT1 was at operating temps. Any input on the subject would be appreciated.

Thanks

NoRiceInside

get an LT4 knock module. if you have an exhaust leak or something that would cause it. or maybe youve got a bad knock sensor...

69z-28

yep. or just get the knock sensor programmed out of the PCM.

FORCE_FED_Z

Thats a little risky given the fact that GM tuned the LT1 pretty decent from the factory, there's a reason its there. Unless you are POSITIVE you are gettin false knock, I wouldn't unhook the sensor. But that's just me.

A loose rocker, exhaust leak, some aftermarket ignitions and such can cause false knock. It could always be your wires goin bad too- they start cross firing and you have true knock there, something that I would get fixed right away.

NoRiceInside

wow youre dumb.

heh that seemed to be overlooked...maybe theres so much knock retard because there's really knocking.

archemedes

I got bad gas recently in Mobile, maybe it made it over your way too