Cranks for 2 seconds and quits

94f450sd

New member
Apr 21, 2018
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If I can't get it running today or tomorrow I'm gonna give up and sell it.let it become someone else's nightmare again.


I had it running with the old motor.i had the new motor running for a couple days,wasn't right but it ran.it ran the day I pulled it back to swap injectors and reluctor.put it back in and it won't do anything but laugh at me.ill be the one laughing when it's sitting in someone else's yard or in a pile of molten metal.

I'll cut it in half and put the bed on the old 2000 6500 with a cat in it.i still don't know why we gave up a perfectly good cat powered truck for this nightmare.
 

94f450sd

New member
Apr 21, 2018
38
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We bought a used ecm for 250.00 this morning.same thing.

Where's my torch and marshmallows?:mad::mad:
 

94f450sd

New member
Apr 21, 2018
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It's something so simple none of us can see it. Take a few days off from it.

That's what I keep saying.its gonna be something so stupid and obvious.

I've backed off it a couple days now.but we need the truck.moving cars and stuff with a car trailer is for the birds.
 

94f450sd

New member
Apr 21, 2018
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I'm just grabbing straws.does oil pressure have anything to do with the starting system?
 

CarolinaHD

Member
Feb 8, 2011
969
6
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NC
Is the coolant tank filled up? Pretty sure the 4500/5500 trucks won't start if the coolant tank sensor is reading low or unplugged.
 

gmduramax

Shits broke
Jun 12, 2008
4,072
248
63
Nor cal
Have you checked to make sure the crank and cam sensors are sending signal? I’m not familiar with the terminology but can’t you hook onto the wires and see the pulses it’s sending?
 

94f450sd

New member
Apr 21, 2018
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Have you checked to make sure the crank and cam sensors are sending signal? I’m not familiar with the terminology but can’t you hook onto the wires and see the pulses it’s sending?

Yup.i don't know what voltages it's supposed to show but it seems as though the sensors are working
 

94f450sd

New member
Apr 21, 2018
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How many grounds should I have at the ecm plugs?I have a few but I also have a few black with white stripes that are nothing.its my experience that black with white stripe should all be grounds.
 

gmduramax

Shits broke
Jun 12, 2008
4,072
248
63
Nor cal
Are you able to communicate with all the modules? Bcm, ecm, tcm? Isn’t there a resistor somewhere between the radio on the data line? I wonder if it’s a communication issue. What about the glow plug control module? Sorry if I’m being annoying just trying to throw out ideas.
 

94f450sd

New member
Apr 21, 2018
38
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Are you able to communicate with all the modules? Bcm, ecm, tcm? Isn’t there a resistor somewhere between the radio on the data line? I wonder if it’s a communication issue. What about the glow plug control module? Sorry if I’m being annoying just trying to throw out ideas.

I can communicate with ecm and tcm. No communication with BCM or door modules.

I'm not sure this truck has a BCM or the door modules being a 5500 series.or at least I haven't found the BCM yet.


I'll take any suggestions anybody throws at me at thus point.
 

94f450sd

New member
Apr 21, 2018
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I do have an 03 4500 with a blown lb7.i have half a pickup with a good lb7.if this thing don't start cooperating I'm gonna take the other 2 apart and put the lb7 in it.