Engine swap holy moly , 06 LBZ into 05 LLY, no start

R

Ron Nielson

Active member
Oct 11, 2009
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Berryton, KS
Lots of grounds available for fixing! Might check the primary devices for poser and grounds.

From another post today:
Disconnected the bats for 30m reconnected and it started..

Amazing how many times this gets the engine going. And it doesn't cost anything. disconnecting negative battery posts on both batteries will get the job done
 

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HDduramax

HDduramax

Diesel is all I need
Nov 19, 2024
21
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Texas
So yeah I completely understand like I said I rewired some wiring harnesses and it cranks but it just won't start unless I put starter fluid spray in the manifold and a couple days ago it did start but now it just doesn't want to start a cranks but does it starts I did find a ground yesterday fix that one as well there's air stuck somewhere and I don't know what to do after priming the fuel it wants to crank just doesn't want to start there's got to be there somewhere trying to figure that out I appreciate all of y'all I'm trying to help me
 
HDduramax

HDduramax

Diesel is all I need
Nov 19, 2024
21
1
3
Texas
Ron Nielson said:
Lots of grounds available for fixing! Might check the primary devices for poser and grounds.

From another post today:
Disconnected the bats for 30m reconnected and it started..

Amazing how many times this gets the engine going. And it doesn't cost anything. disconnecting negative battery posts on both batteries will get the job done
Click to expand...
Cool beans thank you for the ground diagram I'm on it right now
 
TheBac

TheBac

Why do I keep doing this?
Staff member
Apr 19, 2008
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Need to go back over what you've done in detail bc you've forgotten something.

Did you use the entire LBZ underhood wiring harness? If not, what did you use?
Did you attach every ground wire from that harness to its proper spot, whether that be engine block or frame?
Have you checked all the fuses in the fuseblock as good, esp the ignition fuses? (No assuming)
Did you verify your crank and cam sensors are good and the signals are correct with a scanner?
Did you check FPR and CP3 cranking output with scanner?
 
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HDduramax

HDduramax

Diesel is all I need
Nov 19, 2024
21
1
3
Texas
TheBac said:
Need to go back over what you've done in detail bc you've forgotten something.

Did you use the entire LBZ underhood wiring harness? If not, what did you use?
Did you attach every ground wire from that harness to its proper spot, whether that be engine block or frame?
Have you checked all the fuses in the fuseblock as good, esp the ignition fuses? (No assuming)
Did you verify your crank and cam sensors are good and the signals are correct with a scanner?
Did you check FPR and CP3 cranking output with scanner?
Click to expand...
I'm on it right now that's what I'm checking to make sure all my grounds are good make sure nothing is exposed or touching any kind of metal also I did replace the camshaft sensor the crankshaft sensor the high fuel pressure regulator sensor but I'm thinking it's the regulator it might be that but I'm still going to go at this I appreciate you
 
2004LB7

2004LB7

Super Moderator
Staff member
Dec 15, 2010
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Norcal
When you say it only starts with starting fluid, are you saying it continues to run or it only runs while starting fluid is in it?

If it does start with starting fluid then you have a fuel issue
 
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HDduramax

HDduramax

Diesel is all I need
Nov 19, 2024
21
1
3
Texas
2004LB7 said:
When you say it only starts with starting fluid, are you saying it continues to run or it only runs while starting fluid is in it?

If it does start with starting fluid then you have a fuel issue
Click to expand...
No it wants to start but fails so I figured the pressure regulator or the fuel primer it's self later on getting new hoses for fuel line pressure primer along with fuel filter and checking all the grounds thanks for the input
 
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