Diablosport Forums

2005 Hummer H2

MODS-
AirRaid Cold Air Intake
Throttle Body Spacer
4 1/2 single exhaust pipe after Y pipe
No mufflers, dump exhaust

Truck ran good before tune, throws a p0300 code after a few miles of driving with the Diablo tune. (Yes I am using Premium fuel)

After installing Diablo tunes truck runs rough and throws a Multiple Misfire code

I need a tune that will work with my Mods otherwise I can't do much with my Predator except go back to stock Please Help Thanks

First get rid of the throttle body spacer, they are nothing but trouble.

have you done any data logging and gotten your fueling adjusted so that your average long term fuel trims are in line??

http://diablosport.com/index.php?name=P ... opic&t=917

Uploading the log data now to the DSLOGREDUX....i will let you know how it turns out, thanks!

still doing the same b.s. .....random misfires when watching the live log data....cylinder misfires up to 2 counts then clears back to 0...even with adjusting the injector slope....if you got a custom tune i will try it...otherwise i'm thinking that i might have to sell my programmer

i am getting most misfires while at idle....i don't have these issues on the stock tune

Never seen something like this, unless the O2s are going bad...

the voltage on the O2 sensors look good...no codes for O2 sensors thrown....vehicle is a 2005 with 50,000 miles....i don't think they are going bad

check you plugs and wires...