P0300 troubles

[HUMTECH]

If you have plugged injectors make sure you inspect the fuel rails for contamination, if you find any replace fuel filter if its an 03 or 04. if not the filter is in the tank and is not servicable. Other than that it is a pretty straight forward repair. If no contamination is present usually a good power injector flush will clean up the injectors. If you can get injectors that cheap probably just cheaper to replace them but I personnally have had issues with using cheap aftermarket parts but each to their own. Mostly because if i use them at work and the customer comes back i end up doing the job again for free.

[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