Help! Engine won’t turn off

[vandiesel]

Been talking to him. I have another great option as well. It’s a sales job. I don’t want to pay for someone to learn all of it. Michael would be the best.

[Twoxentrix]

Originally Posted by vandiesel

Update. Dealer says no compression on cylinder 8, no blow by and valve train looks fine from above. They also don’t think it’s the bottom end. What gives. I need to get it home from SLC. Motor built to the hilt by Orange County

I’ll say it - that $uck$
I’m probably out of my element here; I don’t understand how you can achieve”no compression” if the valves are seating and no blow by??? Only other thing that would come to mind is head gasket issue, but I would assume they checked that as well. Could you get the same result from a bad glow plug or injector??? I’m rooting for something relatively simple, and interested to hear what the cause turns out to be.

[doublevan2]

Wishing you - sending GOOD THOUGHTS AND GOOD KARMA - gotta be a good light at the end of this tunnel for you !

[vandiesel]

Final verdict burnt exhaust valve. Driving it home on 7 with injector 8 unplugged. Wish me luck. Will start another thread on repair or swap. This engine and how it was built was a big reason I jumped on this van back in 2017. Cryogenic, double whammy throw down and I still get this. My mechanic alway said when not if on a 6.0.

[vandiesel]

Oh and the engine not turning off with the key was my head unit replacement install very recently where the house to chassis battery switch was misplaced on the PCM wire.