Originally Posted by
Aj Grubb
Update on situation....
Truck was plugged in all night.
Ambient temp was 40*f this morning.
Battery voltage with key off and no heater grid was 12.5v
Reloaded the software using the MM3, took the usual several minutes.
Once tunes were all re loaded I set the power level to the 30hp no sound modifier tune.
Fired the truck up and put the exhaust brake on automatic like usual and activated high idle using the cruise control.
Truck sounds fine! No timing knock whatsoever!
Unfortunately I'm still not exactly sure what was causing the problem because I changed 3 variables.
1. Ambient temp was warmer by 10*f
2. Re-wrote PCM
3. Changed power level from 60hp to 30hp.
Good news is that I do not appear to have any kind of mechanical issue.
I'll keep you all up to date if anything changes in case you are interested.