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#7 was acting like an air pump, or essentially a big vacuum leak and those must have been the most affected cylinders.

Just wanted to reply since I don?t want to leave anyone else with this possible issue hanging.

Broken intake valve spring on #7. Replaced it and problem solved.

We have been using a temp gun. 1, 4, 6, 7 are about 180-200. 2, 3, 5, 8 are 450-500*

So it still acts like the DoD cylinders are not firing.

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I have attached the re-read of the computer and a log showing more useful information I hope.

I am honestly at a loss with this. I have checked to make sure DoD is disabled,...

So DoD codes are all unchecked and set to Never Report.

I?m honestly so confused as to why it?s still trying to run in DoD. Temp gun confirmed it, I reloaded the tune to make sure I had the DoD...

@GHuggins do you know how to make sure all 8 injectors are firing? I did a log today after getting it to run better, 1, 4, 6, 7 are cold like they are not firing at all. Still super confused. Thanks!

GHuggins,

I really do appreciate you taking the time to help out; my dad is also very thankful. I called him this morning and relayed what you and the others have shared. He is going to pull the...

GHuggins,

Thanks for taking a look at it and giving me something to look at. Do you think it caught two bad injectors originally then kicked it into limp mode? There is a possibility that they...

blinrsquirrel,

Oddly enough the cam and lifters looked fine; no scouring and lifters weren?t squishy or damaged.

I just don?t know what could be causing the issue at this point then. We...

Hey 5FDP,

Thanks for the quick reply. Unfortunately we did as we my dad did not want to do the 0* lockout; it has the VVT and a new L83 Cam Bolt.

Would it be worth the hassle to install a...

Hi all,

I may be in over my head here with this 2016 Suburban Gen V L83. Long story short, my parents use it to chauffer my 98 year old grandma. There were driving it and it just gave up. They had...