05 GMC Injector Issue.

rsaint said:

Have a 05 Gmc dmax with 380k bought it with a injector issue bought 8 new Bosch injectors and still shows #7 as a issue and a hammer noise, verified correct injectors
whats the chances of having another bad injector in same spot. Also with the Tech 2 hooked up as soon as rpm goes up you cannot monitor injector rates.

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new indyguy said:

My 2005 LLY had the same issue this summer. The individual injector wire harness on #7 was pooched. Wire was broken internally. I could jiggle the wire and it would act normal. Went for a test spin and as soon a I hit a bump or 2 it would act up again.
Ended up changing #2 and #7 injector wire pigtails and all is good. Cheap fix.
https://prosourcediesel.com/wp-cont...IL-GENUINE-BOSCH-CONNECTOR-282250480971-2.JPG

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Qdingo said:

Check wiring at that injector especially at the 90 degree bends
move the harness around and see if it changes

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tex78 said:

Would have a Injector code if it was connector to injector, which kills all 4 in that loop

That's adding fuel, did you replace the high side lines when you did injectors??

And you have programmed the flow rates with tech 2 into ecm and gpcm??

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Mountainman52 said:

Thats the fix no need for new injectors , been there done that vary common problem on the 05 Dirty max. Can order online from Amazon !

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rsaint said:

No we never changed high side lines, only code that come up once was 7 misfire, I would have to see if he did program them,
he uses his tech 2 for when he does dmax conversions into surbrbans when he has to marry differnent modules.

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rsaint said:

No we never changed high side lines, only code that come up once was 7 misfire, I would have to see if he did program them,
he uses his tech 2 for when he does dmax conversions into surbrbans when he has to marry differnent modules.

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Mountainman52 said:

Thats the fix no need for new injectors , been there done that vary common problem on the 05 Dirty max. Can order online from Amazon !

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tex78 said:

Well could have crap in the new injectors now

The lines rot from the inside out, rust and crap

Diesel has lots of moisture in it, and them lines take a chit kicking

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tex78 said:

P0202 injector control fault, and p2149 group fault if it's the wiring connectors

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rsaint said:

I don't think they come up

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tex78 said:

And 1-3-6 are all past what I would say is good, that being 3mm

I find after 3 it's too much for ecm-ficm to control and milage gets bad, washes cylinders out ect

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rsaint said:

Ok it could be over buddies head may have to take it into dealership, also it would not start at -20 without being plugged in also have a video of a cold startup and the noise but not sure how to post it.

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