Fuel injector stuck open

Duramax stuck open fuel injector. 2003 lb7 GMC. A stuck open injector causing lots of black smoke and hard knocking noise. Replaced with new injectors fixed the problem.

[@jacksonstephens9772]

It's okay, Lb7 are infamous for bad injectors

[@farmdude]

Probably because it’s a nightmare to change one out. I have done it 4or 5 times on the lb7 and I swear every time I’ll never do it again.

[@Florida239]

How much did that cost ya

[@farmdude]

About $3,400 for all injectors. Did it in about 12 hours. Get new return line bolts if you’re going to do this project. It’s a must.

[@jasonbusch3624]

You probably could have fixed it with some Motorkote in your fuel.

[@farmdude]

If it would have worked I wish I would have known about it.

[@dickdiver9614]

A sign of your injectors being gone is white smoke. Does that thing have a turbo charge?

[@farmdude]

Yes.

[@dickdiver9614]

@@farmdude Seals in the turbo allowing oil into the system.?

[@farmdude]

Well the new injectors fixed it. So that must of been the issue