Duramax Head Gasket Replacement

[More Power]

The above code set a day or two ago. I cleared it, and the light remained off. Between the code indicating a problem with cylinder #7 and the latest balance rates below, I think we can can safely assume a problem exists with at least #7 (or maybe the whole lot of them...).



As others have pointed out here, a cylinder problem (compression, valve train, etc) has to be ruled out before assuming a problem with the injector(s). That's coming... I saw on YT that Harbor Freight sells a compression test set that includes a glow plug adapter for the Duramax.. for $30.

Has anyone seen more impressive balance rates?

[DmaxMaverick]

I'll wait for the GP visual and compression test. There's a piece of this puzzle missing, and I have nothing to add to the continuing saga. I still think that, if accurate, 2 adjacent cylinders increasing that much fuel, while the remainders are decreasing, adding in some smoke, indicates more than just an injector error or deficiency. Possibly a compression loss, of some sort. I do notice though, 14.16mm seems to be a balancing limit. An actual limit of fuel volume an injector is able to correct, or simply a display limit? I don't know, but it means something, even if irrelevant at this point. It's repeated enough to not be coincidental.

[More Power]

I'll wait for the GP visual and compression test. There's a piece of this puzzle missing, and I have nothing to add to the continuing saga. I still think that, if accurate, 2 adjacent cylinders increasing that much fuel, while the remainders are decreasing, adding in some smoke, indicates more than just an injector error or deficiency. Possibly a compression loss, of some sort. I do notice though, 14.16mm seems to be a balancing limit. An actual limit of fuel volume an injector is able to correct, or simply a display limit? I don't know, but it means something, even if irrelevant at this point. It's repeated enough to not be coincidental.

With those numbers I'm amazed that more codes aren't continually being set. And, I agree that the coincidence of same reading of "14.16" on two cyls seems a bit odd to me as well - what are the odds. We should be thankful that good ole #3 is within spec, if only by a little... (that's a joke... )

I can't begin the process of taking things apart till we get the Blazer sorted. There's only so much room in the garage... Hoping to get a callback from a local auto salvage yard today about a good used hatch and end-gate. Get those on, and then the Blazer can sit outside.