03 cummins runs horribly rough

muddindodge · 08-15-2008, 04:50 PM

Hey guys....just got done with a head gasket replacement. Put everything back together, set valve lash according to manual, and fired the truck up to have it run like crap. Its not the fuel pressure sensor, regulator, map, or fca. I just put a new cp3 into it and it still acts the same. No smoke, just runs rough at idle and almosts like a misfire or off timing when accelerated. I have 18 psi constant from my fuel pump. I don't know what else to check. Truck has been down for a while. Any help is appreciated. Thanks.

rpainter · 08-15-2008, 04:51 PM

cel on or any codes? and do you happen to have a water in fuel light on?

__________________
2004.5 3500 lots of goodies (almost done)

BBRAM is my hero

muddindodge · 08-15-2008, 04:54 PM

forgot to mention all injectors were tested and were good. Just drained the whole fuel tank and changed it out just in case, still runs the same. No codes.

rpainter · 08-15-2008, 04:59 PM

did you put the injector wires back on the right way? also check teh rail sensor plug and make sure it is on the right way

__________________
2004.5 3500 lots of goodies (almost done)

BBRAM is my hero

muddindodge · 08-15-2008, 05:02 PM

I put em on green, brown, brown , red, pretty sure thats right. Whats the teh? If your talking about the fuel rail pressure sensor theres only one way it will go on.

rpainter · 08-15-2008, 05:10 PM

Quote:

Originally Posted by muddindodge

I put em on green, brown, brown , red, pretty sure thats right. Whats the teh? If your talking about the fuel rail pressure sensor theres only one way it will go on.

wrong the plug can go on either way

__________________
2004.5 3500 lots of goodies (almost done)

BBRAM is my hero

muddindodge · 08-15-2008, 05:18 PM

checked it, its on the right way

rpainter · 08-15-2008, 05:20 PM

then if it not electrial then I would start by rechecking the connector tube torque and make sure the injector harness are in the right spot.

__________________
2004.5 3500 lots of goodies (almost done)

BBRAM is my hero

muddindodge · 08-15-2008, 05:24 PM

how are your harnesses run? i have one thats by itself that goes to the front, and then two taped together at different lengths....?

muddindodge · 08-15-2008, 05:58 PM

aside from bringing the truck in to get scanned is there anything else that might be the cause?

**JacktheBear3** · 08-15-2008, 06:08 PM

how do you know it's not the fca?

__________________

2002 24V, 2500 Quad Cab, Dark Silver, We Bit O Lift, Plain Jane, Comp (drag), BDRAD, Smarty Stack, 027 SO VP, FASS 150/150 w/BigStraw, F1 Mach 7.?, The Girlz are T61 & S400, PDR Stg III Head w/Rings top & bottom, HTS/FTE FULL billet Auto, SS Single Converter, Optix Gauges ( all high #'s), Detroit Locker, Custom 6" Miters, and plenty O junk in the Trunk...

Floor It CP3 MOD's & PPE Dual Fueler Kits
6.7 Race / Delete Pipes and Sims in stock

muddindodge · 08-16-2008, 08:24 AM

the fca was replaced when the new pump was put in.

08-15-2008, 04:50 PM	#1 (permalink)
muddindodge Newbie Join Date: Aug 2008 Posts: 8 muddindodge's Truck Pics	03 cummins runs horribly rough Hey guys....just got done with a head gasket replacement. Put everything back together, set valve lash according to manual, and fired the truck up to have it run like crap. Its not the fuel pressure sensor, regulator, map, or fca. I just put a new cp3 into it and it still acts the same. No smoke, just runs rough at idle and almosts like a misfire or off timing when accelerated. I have 18 psi constant from my fuel pump. I don't know what else to check. Truck has been down for a while. Any help is appreciated. Thanks.

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08-15-2008, 04:51 PM	#2 (permalink)
rpainter Diesel Head Join Date: Dec 2006 Location: harpers ferry wv Posts: 1,149 rpainter's Truck Pics	cel on or any codes? and do you happen to have a water in fuel light on? __________________ 2004.5 3500 lots of goodies (almost done) BBRAM is my hero

08-15-2008, 04:54 PM	#3 (permalink)
muddindodge Newbie Join Date: Aug 2008 Posts: 8 muddindodge's Truck Pics	forgot to mention all injectors were tested and were good. Just drained the whole fuel tank and changed it out just in case, still runs the same. No codes.

08-15-2008, 04:59 PM	#4 (permalink)
rpainter Diesel Head Join Date: Dec 2006 Location: harpers ferry wv Posts: 1,149 rpainter's Truck Pics	did you put the injector wires back on the right way? also check teh rail sensor plug and make sure it is on the right way __________________ 2004.5 3500 lots of goodies (almost done) BBRAM is my hero

08-15-2008, 05:02 PM	#5 (permalink)
muddindodge Newbie Join Date: Aug 2008 Posts: 8 muddindodge's Truck Pics	I put em on green, brown, brown , red, pretty sure thats right. Whats the teh? If your talking about the fuel rail pressure sensor theres only one way it will go on.

08-15-2008, 05:18 PM	#7 (permalink)
muddindodge Newbie Join Date: Aug 2008 Posts: 8 muddindodge's Truck Pics	checked it, its on the right way

08-15-2008, 05:20 PM	#8 (permalink)
rpainter Diesel Head Join Date: Dec 2006 Location: harpers ferry wv Posts: 1,149 rpainter's Truck Pics	then if it not electrial then I would start by rechecking the connector tube torque and make sure the injector harness are in the right spot. __________________ 2004.5 3500 lots of goodies (almost done) BBRAM is my hero

08-15-2008, 05:24 PM	#9 (permalink)
muddindodge Newbie Join Date: Aug 2008 Posts: 8 muddindodge's Truck Pics	how are your harnesses run? i have one thats by itself that goes to the front, and then two taped together at different lengths....?

08-15-2008, 05:58 PM	#10 (permalink)
muddindodge Newbie Join Date: Aug 2008 Posts: 8 muddindodge's Truck Pics	aside from bringing the truck in to get scanned is there anything else that might be the cause?

08-15-2008, 06:08 PM	#11 (permalink)
JacktheBear3 FTE Diesel Join Date: Mar 2007 Location: Northeast, Ohio Posts: 2,158 JacktheBear3's Truck Pics	how do you know it's not the fca? __________________ 2002 24V, 2500 Quad Cab, Dark Silver, We Bit O Lift, Plain Jane, Comp (drag), BDRAD, Smarty Stack, 027 SO VP, FASS 150/150 w/BigStraw, F1 Mach 7.?, The Girlz are T61 & S400, PDR Stg III Head w/Rings top & bottom, HTS/FTE FULL billet Auto, SS Single Converter, Optix Gauges ( all high #'s), Detroit Locker, Custom 6" Miters, and plenty O junk in the Trunk... Floor It CP3 MOD's & PPE Dual Fueler Kits 6.7 Race / Delete Pipes and Sims in stock

08-16-2008, 08:24 AM	#12 (permalink)
muddindodge Newbie Join Date: Aug 2008 Posts: 8 muddindodge's Truck Pics	the fca was replaced when the new pump was put in.