Hello everyone, my name is Brunner and I drive a Hummer H2 6.0 2004 for some time now I have misfires on several P0300 cylinders.
I renewed, without success: Spark plugs, ignition cables, ignition coils, cable set for ignition coils, right manifold, lambda probes all 4, air sensor, throttle valve, intake manifold with seal and injectors, Kats checked, the error only comes at 2300-2600 rpm on 1, 5,6,8 cylinders. PLEASE does someone have an idea what that can be, thank you.

 

try do a crankshaft relearn if you have a tech2 or a very good scanner tool. literally takes like 2 seconds to complete once the procedure is selected

 

I will do thank you, thank you. I will then inform you.

 

LOOK Before you POST anything. This is in the WRONG section, it says so at the top "Do NOT post vehicle questions in this section"

All H2 questions go in the H2 section.......................... crazy like that.

Welcome and Good luck.

 

That’s a lot of things you’ve replaced, not knowing what all that consist of , is that what I will end up doing.?
I went in for transmission was not shifting too high RPM, for 1st then 3rd

Now just informed by my mechanic- same issue ( I had no idea about that misfire- is there a sound that I should have Heard while driving, or? Just over time wouldn’t know? he sd he used a “ reader”
I didn’t quite understand everything he sd , but the transmission lines are rotted also, Apparently there’s 4 lines & somehow the lines eventually has something to do with the radiator the lines are $600. From direct factory … does this sound true.

 

This guy replaced a bunch of stuff and had missfires.

 

 

THANK YOU THANK YOU just great, my Hummer H2 is running properly again.
Everything is fine again. Thanks for the help.
know why I love the people and the USA.

This is my Hummer H2 Thanks again.

 

That is a good looking H2, I bet you are like a Rock Star driving that around.

 

what fixed the issue?