2004 will not start

[puddlestomper]

I recently acquired a 2004 3500 2wd w/ allison auto. It will turn over, but not start. Fuel is up to the filter. Pump the little hand pump until it is tight. I put my computer code reader on the thing, but I can't get a signal from the computer. Is there any way to tell if the computer is good without the port? I have tried 2 code scanners, but neither will come on with this vehicle, but work with my car.

---AutoMerged DoublePost---

Oh, I just read the VIN and it is the LLY engine.

[2500HeavyDuty]

Replace the cigarette lighter fuse, the OBDII port draws its power from there. And see if you can get codes after that.

[puddlestomper]

I got the scanner to work. cigarette lighter was shorted out. No codes. Everything says pass. I primed the fuel system, checked all the plugs I could, everything seems ok but it just spins over. The only thing I see that isn't right is the oil pressure gauge stays to the far right, pointing down and right.

[Whit]

crack injector lines 1,3,4 and prime it several times then tighten em up and try again.........should fire

[2500HeavyDuty]

New fuel filter yes? Does the exhaust smell like fuel at all when cranking, if so it could be an injector hung open keeping it from firing. one way to check that is to pull the glow plugs and turn the engine over and if they are hung open fuel will come flying out.

Can you observe the rail pressure while cranking the engine over with your scan tool?

Originally Posted by Whitmore crack injector lines 1,3,4 and prime it several times then tighten em up and try again.........should fire

u dont want to do that, and 1,3,4 are the hardest to get to with the engine and components fully assembled they're buried under crap

[puddlestomper]

So another guy on another forum had a bad security circuit issue, and did a security "relearn". KNow anything about that? He said he didn't have a radio, put one in from a salvage yard, did a relearn and it started right up. And I have no way to smell the exhaust while I am cranking, it is outside, but I don't smell trace amounts of smoke when I get down there. This has the exhaust that dumps underneath in front of the axle.

[2500HeavyDuty]

heres a thread replacing ecm? about the "relearn procedure" post #3

[puddlestomper]

Did the relearn thing. Now how tight is the manual prime button supposed to get? Seems like it is now losing prime?? When I crank it, the button goes back to very easy to push like when you open the bleed screw.

---AutoMerged DoublePost---

Oh, and still no start. Did not smell anything at the exhaust end of things. Don't know if it is getting fuel through the system.

[Whit]

I now see this is a Duramax................I thought you had a Cummins....sorry dude but scrap everything I said earlier

[2500HeavyDuty]

Originally Posted by puddlestomper Did the relearn thing. Now how tight is the manual prime button supposed to get? Seems like it is now losing prime?? When I crank it, the button goes back to very easy to push like when you open the bleed screw. ---AutoMerged DoublePost--- Oh, and still no start. Did not smell anything at the exhaust end of things. Don't know if it is getting fuel through the system.

check all fuel connections for leaks. around the fuel filter and such

[puddlestomper]

Guess I should do a signature, huh? All of the fittings for fuel are tight and dry from the filter to the injectors.

[mysterync]

Could be a cracked fuel filter housing. Seen it happen quite a few times now.

NEVER CRACK A COMMON RAIL HP FUEL LINE..Whitmore knows this just didnt say it

[EDP]

I would not crack a fuel line on a dmax

when cranking over are you getting any smoke or fuel smell?
is the security light flashing?
do you have a scanner of somesort to check voltage at cranking?

[puddlestomper]

I only have time to work on it at night outside, hard to see smoke. No smell. No light flashing. Have a scanner, but can't check voltage. If you are asking about batteries, I have two new batteries I just got. I will try to get the filter housings changed between pickups here in a day or so. Surely both can't be cracked. And what is wrong with cracking the lines? Or do you think a common rail system could do something with the little bit of pressure?

[2500HeavyDuty]

the cr system will bleed it self anyway, ive replaced injectors many times and itl fire up with out bleeding the injector lines, just takes a while.

where you located? maybe some one with a good scanner can see whats goingon. try unplugging the FCA and turning the engine over, this will command 26kpsi. are all the wires connected and snug? check the number 5 and 7 injector harness make sure they are making solid connections, back two on the passenger side)