Will Getting a New PCM Help

[Trucked-up]

I have a 99 GMC ECSB w/ a 99 TA LS1. Only mods are polished throttle body, UPD lid, 373 gears w/eaton locker. I used the truck intake.

I am getting 8 degrees of knock retard, beginning at about 70% throttle. Other than that the truck runs great. 250 rwhp & 296 lb/ft of torque.

I have run 100 octane and the knock is still there.

If I purchase a new PCM and program it will this get rid of the knock?

If I replace the knock sensors? The sensors for the LS1 and the 5.3 are the same.

Thanks,

Tony

[L82gofast]

Sure sounds like false knock if its still there with 100octane gas. Not sure if a PCM will help you out. Try putting a 10k resistor in line with each knock sensor to desensitise them and if it helps, I would go after replacing them.

Mike

[farmtruc]

If that doesn't work, try getting your PCM reflashed with a newer calibration. GM comes out with many updates to the PCM and sometimes it's for knock.

go to http://calid.gm.com:8082/VINEntryPre.do and see if there's any updates.

if so, I can flash your pcm for you.


later,

allen