P0300 troubles

[RippSpeed]

They are stock oem units...
http://cgi.ebay.com/ebaymotors/NEW-G...54462994QQrdZ1

these are the ones I purchased... Same part # as the Hummer Dealership...

I myself have never had issues with aftermarket stuff... But then again I stay with the big name guys...

[HUMTECH]

Thats a smokin deal, maybe you should sell them to your dealer with considerable markup

[RippSpeed]

oohhh by the way I have an 2005 H2. But I will check the fuel rails for contamination. But as for running the fuel injector cleaner, I did run a big bottle of LUCAS injector cleaner and Techron injector cleaner...

[HUMTECH]

That is not a bad idea as a maintenace item. What we do in out shop is disable the fuel system and hook up an external system with a flush chemical and run the engine off that. using an air source to provide the proper psi ratings (60psi) so that it gets a straight chemical flush. The flush costs more than what your paying for new injectors though so as long as its your labour its pretty much a no brainer to just replace them. if ya run into any trouble with the job let me know and i can send you any info you may need.

[mdoyle]

I agree with you on replacement, I always wondered how much the injectors themselves cost -vs- all the fancy flush stuff. When I owned a Chevy Duallie I opted for the Wyynns fuel service and it was around $200 and didn't do a damn thing.

Nice to know the injectors are reasonable, screw cleaning them, just replace them!

[RippSpeed]

WOW!!! I give this maintenance work a 2 Thumbs up !!!

Its wasnt as easy as I thought but I rate replacing the injectors, on a scale of 1 to 10 ... 10 Being the hardest and requiring advance mechanic knowledge. I rate this a 3 or a 4 ...

But, after replacing the injectors ... I had to reset the factory ecu with my Hypertech programmer. When I started the rig after the install it idle really really rough to the point of dying. I doubt check for leaks and made sure I plug in all the injector plugs. And shut the rig down and reset the factory ecu with the hypertech programmer. And re-started the rig, it runs 10X better idles 10X better. I went for a short little drive and WOW!!! I can definitly feel the difference in acceleration and smoothness of the H2 at speed. The install took me a total of 1hour 30mins. It would have been faster but I had to have a steep learning curve... First Domestic V8 I worked on... I'm use to working on little 4cylinder import motors...

I drove it to work today and cover a total of 80miles. And the Best mpg I was getting a rock solid 13.2mpg ... I totally suggest doing this if your H2 is running alittle rough or past 60,000 miles on the clock...

The only thing I had issues with was trying to replace the spark plugs... I couldnt seem to pull the plug wires to get to them... It was either too late or I was just too tired...

HUMTECH:
Can you help me out on giving me information on how to replace my spark plugs... I want to install these NGK Iriduim spark plugs... Thanx in advance

[HUMTECH]

First off give the wires a twist (on the rubber boot) to free them up from the plug and then what i do is position a prybar on the steel boot and while pulling upwards on the steel boot pry it off with your bar and they should pop right off. Does that make sense? I can try to word it differently if not.