Swapped the crank sensor already. I believe the cam sensor would still let it start it would just be extended cranking. I’ll have to double check that but I’ll swap it out anyway.
LLY new engine won’t start.
- Thread starter gmduramax
- Start date
Swapped the crank sensor already. I believe the cam sensor would still let it start it would just be extended cranking. I’ll have to double check that but I’ll swap it out anyway.
Back to the basics..... did you pump the primer and bleed off the air? Does the primer stay hard or get soft?
I would think that since it starts on starting fluid it is not a glow plug problem because it should keep running after it starts like all of my diesel equipment dose . I think you are on the right track gmduramax Good luck please let us know what you figure out !
The factory filter head it’s gone. It has a fass with a nicktane added. Air was bleed there and at the fuel pressure sensor because I forgot to tighten it :rofl:
That's why I started with asking about compression....What does it pump? Especially when running a big injector, the lack of glows makes a big difference in combustion temp and therefore cylinder pressure. I had a stock engine but without the IAH lbz in during the winter that had a disconnected 12V feed to the gpcm who was complaining about it not running below 32deg ambient. Started an ran perfectly normal above 32. Plugged in the gpcm and tried it at 15 degrees the next day and it made all the difference.
Possibly one other thing to check, make sure a mouse didn’t make it under the fuse box while it was sitting and chew the insulation off your crank sensor wire. I have one in the garage right now that did the same thing and that was the cause. Probably a long shot but it is easy to check.
Coolant temp sensor plugged in? When we went standalone harness & no coolant, we had to wire in a resistor to the ect circuit to make ecm think it wasn't -50 degrees
I know 60% injectors are not a huge jump but that is what I'm leaning towards, the tuning. Do you have access to the tuning? You didn't mention a retune for them?
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I know 60% injectors are not a huge jump but that is what I'm leaning towards, the tuning. Do you have access to the tuning? You didn't mention a retune for them?
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The injectors have been in the previous motor and it’s tuned for them. Coolant temp sensor is plugged in and reading.
Still got the old sensors? I say it’s a cam/crank sensor issue or a wiring ground issue.
Small ground on the pass lower side of the block in good shape?
Small ground on the pass lower side of the block in good shape?
I’m leaning towards that. Ground is good. Swapped in a working crank sensor. Going to swap the cam sensor.
Still waiting on them, actually I’ll call them today. I’ll make sure and update.
Update....... still doesn’t run, it’s throwing crank sensor voltage and fuel pressure sensor voltage codes for no reason. Wiring, sensors, ecm, ficm everything checks out. Debating doing an LBZ swap. Dealer is stumped, which never happens I know the tech very well. We’re still trying to figure it out we haven’t gave up yet.
It’s Chad. I’m gonna bounce some ideas off him tomorrow and see if we can come up with anything
