[ob_1jr]

Originally Posted by Jonw

I have an 04 since new. Within the 1st year it developed a miss. Dealer replaced the injector module. It ran great for another year when the miss reappeared. This time it was a wire to the #2 injector rubbed thru and shorting out. I suspect that was the main problem all along and not the module at all. I did not consider this a problem at all since it was covered by warranty and the dealer was able to fix without much hassle.
My Duramax has ran totally problem free since the shorted wire.

Is your truck an LLY or LB7...I think only LLY has had the injector harness issue since the LB7 injectors are different. As far as the 04 LB7 engine, it is probably the best one out of all of them. I have had mine for 4 years and I have 53,000 miles or so on it and no major problems....just had to have the water pump replaced because it was leaking....this happened 2 times, but the second time was because of a faulty pump since it only lasted about 4500 miles. Now, in 04 there was 2 engines...the LLY toward the end and LB7 at the beginning. Biggest difference was the injector design, turbo, and emissions crap. The LLY has a cat on it from the factory...the LB7 does not for federal emissions trucks. The LB7 engine is known for having the best mileage out of all the duramax's. If I were to buy another truck I would look for an 04 LB7 just like i have now.