No, thank you for such an informative post with a video, well worth watching for me.


It's time to start doing some mods that make absolute sense.

 

2006 - 186k and started having problem with noises, etc. I guess I will be back to 000001
when she returns.

 

2006 just turned 60,000 miles...

 

165K / 2004

Runs perfectly

 

Just bought my first Hummer. 2003 H2 with 115K on it.

 

2008 with 101k

 

2004 106k miles and trash. I've sunk so much $$$ into this damn truck. Brake lines basically disintegrated last year, now i've got low voltage reading on knock sensor.

 

I'm starting to get the same thing on the knock sensor. That is however not at all specific to the Hummers. That problem has plagued the GM LS engines since they came out. What happens is water gets past the stupid foam blocks under the intake manifold and then gets past the old dried out rubber plugs and into the knock sensor cavity. I had to fix this on my GMC truck. You need to get both knock sensors (do NOT get generic ones as they only last a year or less, only AC Delco), a new Dorman knock sensor harness, new set of intake manifold gaskets. Have to remove the entire intake manifold and clean up under it replace the knock sensors, and seal them very well. You will probably get better performance and a bump in fuel economy once you replace them. Its a several hour job to do. Search online for GM truck knock sensor replacement for tips on sealing the new ones and the whole process to replace them. Its actually pretty easy, just a bit fiddly and time consuming.

On mine - I'm holding for a little bit. I'm going to use the opportunity to change the valve cover gaskets, swap to a TBSS flex fuel intake manifold and injectors and 90mm TB while I'm at it. The TBSS intake flows better and nets 10-20 hp.

 

Yea, I've contemplating doing sensors, but I am obsessed with finding the misfire on my old Acura (tried every easy fix.) Plus its cold outside in the northeast now. I've seen plenty of write ups and some videos, nothing difficult except for not end up with extra bolts

 

2004
147,404
Keeping my fingers crossed that nothing goes wrong!