Canadian Hummer Club Forums

Dropped it off this morning...they assured me all will be taken care of ( laughing under my breath). We will see but I made it clear I will not be paying for it. Hoping it us just coil or plus wire etc....

So the dealer is taking care of the misfire free if charge. I had to make some noise but the squeaky wheel gets the grease. It goes in on Oct 7th and they are pulling the head and see what is required for each cylinder. The mechanic said he thinks on at least one the guides are sticking. There is a very slight rough idle...barely noticeable.


The cylinder pressures were showing 120lbs excepting one at 105 and one at 130.


They did put some combustion cleaner in there for now and cleared the check engine light. It hasn't come on since but it still registers a misfire so they have agreed to do the work.


Other than that it is running great and I'm enjoying the ride! I'll keep you updated on the results of the work.

Post some pictures of the H3.....

yeah, where are the pics?!  

How do I attach pics here? LoL!

New problem...door ajar warning comes on randomly and if parked and licked horn alarm comes on. This just started today after rain last night.


Read this may be faulty door jam switches or wiring by the door being worn. Can anyone shed some light on this?

The door switch can be faulty , they had to change mine on my 06 3 times and once on my 09. not yet on my 10 , the switch itself sometime drys out and crack allowing the moisture to get in and interfere with the contact leading to door ajar signal. they changed them under warranty on mine, i dont know the cost of each switch, but since its easily accessible they surely over charge for the part, when its hard to access, labor kills you for a 5$ parts,

Yup turned out to be the rear door switch....dealer fixed it free of charge. Thx!!!

Below are the results (dealer email) of the Leak down test on my H3....I know the results are not good, however the dealer is replacing the cylinder head under warranty. My question is should I be asking for a secondary leak down test to confirm the new cylinder has resolved the issues?


We have completed the last step which was required for diagnosis purposes.

The leak down test is as follows;

Cly # 100psi initial leak down in %


5 95 67%

4 95 22%

3 95 30%

2 95 22%

1 93 37%


Based on leak down test #5 cylinder leak down excessive. As per

documentation normal leakage is from 12-18%. Any cylinder with more than 25%

requires service.

As per recommended repairs based on final findings vehicle requires cylinder

head replacement.

Hey how is the H3 so far ? Haven't heard any news......