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1998 k3500 7.4l wont start #4541232
10/12/17 12:58 PM
10/12/17 12:58 PM
Joined: Oct 2017
Posts: 6
Florida,Ocala
jubinjr Offline OP
jubinjr  Offline OP
Joined: Oct 2017
Posts: 6
Florida,Ocala
I am having trouble starting my 1998 k3500 7.4l dually. One day it just shut down. Wound up being the coil. I replaced it and drover her for about 2 weeks. She shut off again. Thought maybe it was fuel pump. I replaced the fuel pump nothing. Replaced the coil again. Nothing. I replaced the camshaft postion sensor. I also replaced the crankshaft position sensor. I replaced the rotor and distribitor cap. I also replaced the ignition control module. Also the fuel filter. I am getting beautiful spark and plenty of fuel pressure. I am at my wits end with this truck and i cant think of anything else. Also i replaced all 8 spark plugs. I checked the timing by putting her at tdc. I also checked the maf sensor and map sensor. Please if anybody has any info please help...

Re: 1998 k3500 7.4l wont start [Re: jubinjr] #4541238
10/12/17 01:02 PM
10/12/17 01:02 PM
Joined: Feb 2013
Posts: 11,183
Phoenix, AZ
Nick1994 Offline
Nick1994  Offline
Joined: Feb 2013
Posts: 11,183
Phoenix, AZ
Spark to all cylinders?

Injectors pulsing?

Squirt some fuel down the throttle body and see if it tries to start.


2015 Hyundai Sonata 2.4L 89k Motorcraft Synthetic Blend 5w30 & OEM
2000 Toyota Camry 2.2L 232k Valvoline 5w30 & Fram Ultra
1996 Jeep Cherokee 4.0L 148k Mobil 1 HM 10w40 & Fram Ultra
Re: 1998 k3500 7.4l wont start [Re: jubinjr] #4541254
10/12/17 01:19 PM
10/12/17 01:19 PM
Joined: Oct 2017
Posts: 6
Florida,Ocala
jubinjr Offline OP
jubinjr  Offline OP
Joined: Oct 2017
Posts: 6
Florida,Ocala
Spark to all cylinders yes. And i tried carb cleaner and it doesnt start. How do i tell if they are pulsing

Re: 1998 k3500 7.4l wont start [Re: jubinjr] #4541260
10/12/17 01:29 PM
10/12/17 01:29 PM
Joined: Feb 2013
Posts: 11,183
Phoenix, AZ
Nick1994 Offline
Nick1994  Offline
Joined: Feb 2013
Posts: 11,183
Phoenix, AZ
I know on TBI engines there’s a bulb you can plug in to see if the injectors are getting power, not sure on the Vortec engines. Someone on here will probably know, might be able to just use a test light while cranking.


2015 Hyundai Sonata 2.4L 89k Motorcraft Synthetic Blend 5w30 & OEM
2000 Toyota Camry 2.2L 232k Valvoline 5w30 & Fram Ultra
1996 Jeep Cherokee 4.0L 148k Mobil 1 HM 10w40 & Fram Ultra
Re: 1998 k3500 7.4l wont start [Re: jubinjr] #4541265
10/12/17 01:40 PM
10/12/17 01:40 PM
Joined: Oct 2017
Posts: 6
Florida,Ocala
jubinjr Offline OP
jubinjr  Offline OP
Joined: Oct 2017
Posts: 6
Florida,Ocala
I forgot to mention the only code showing in the systmem is p1351 which is high voltage to icm but its a brand new oem icm i put on and nothing but the code keeps popping up everytime i clear it

Re: 1998 k3500 7.4l wont start [Re: jubinjr] #4541284
10/12/17 02:20 PM
10/12/17 02:20 PM
Joined: Aug 2003
Posts: 13,219
NE,Ohio
Rand Offline
Rand  Offline
Joined: Aug 2003
Posts: 13,219
NE,Ohio
sounds like a possible wiring issue.

What fuel pressure do you have? does it hold fuel pressure for at least a few mins?

Sounds like maybe its time for it to go to someone with better tools and troubleshooting guide.


2019 Jeep Cherokee Trailhawk 2.0T
Re: 1998 k3500 7.4l wont start [Re: jubinjr] #4541291
10/12/17 02:25 PM
10/12/17 02:25 PM
Joined: Oct 2017
Posts: 6
Florida,Ocala
jubinjr Offline OP
jubinjr  Offline OP
Joined: Oct 2017
Posts: 6
Florida,Ocala
I took it to a mechanic shop and they are the ones who told me to replace the icm and spark plugs.

Re: 1998 k3500 7.4l wont start [Re: jubinjr] #4541298
10/12/17 02:33 PM
10/12/17 02:33 PM
Joined: Aug 2003
Posts: 13,219
NE,Ohio
Rand Offline
Rand  Offline
Joined: Aug 2003
Posts: 13,219
NE,Ohio
Originally Posted By: jubinjr
I took it to a mechanic shop and they are the ones who told me to replace the icm and spark plugs.


Well I hope you get your money back then because it didnt fix it.


2019 Jeep Cherokee Trailhawk 2.0T
Re: 1998 k3500 7.4l wont start [Re: Rand] #4541307
10/12/17 02:43 PM
10/12/17 02:43 PM
Joined: Oct 2017
Posts: 6
Florida,Ocala
jubinjr Offline OP
jubinjr  Offline OP
Joined: Oct 2017
Posts: 6
Florida,Ocala
Well i did the work myself. All they did was kind of diagnos it. Im just trying what else could be causing this issue. She sounds like she wants to fire but wont

Re: 1998 k3500 7.4l wont start [Re: jubinjr] #4541354
10/12/17 03:30 PM
10/12/17 03:30 PM
Joined: Sep 2015
Posts: 1,631
USA
mk378 Online content
mk378  Online Content
Joined: Sep 2015
Posts: 1,631
USA
My friend has the same engine. The problem he had turned out to be a hole in the main spark wire from the coil to the distributor leaking sparks out. A test plug would fire outside the engine, but it was not enough spark to start it. If you can't get it to fire at all on starting fluid you should take a close look at the ignition parts, which as you know are very hard to see where they are way at the back of the engine.

Throwing codes related to the interface between the PCM and ICM could be a problem with the low voltage wiring, or even a bad PCM.

Last edited by mk378; 10/12/17 03:32 PM.
Re: 1998 k3500 7.4l wont start [Re: jubinjr] #4541422
10/12/17 05:04 PM
10/12/17 05:04 PM
Joined: Aug 2005
Posts: 924
dayton oh
kc8adu Offline
kc8adu  Offline
Joined: Aug 2005
Posts: 924
dayton oh
a bad coil wire can cause an insulation failure in the coil.
gets a gap burned in it that has to be jumped which causes overshoot.
you can get a spark with the plug out that is too weak under compression.
spark too weak or worse jumped timing.
have also seen rotor button arc through.

Re: 1998 k3500 7.4l wont start [Re: jubinjr] #4541886
10/13/17 06:20 AM
10/13/17 06:20 AM
Joined: Oct 2017
Posts: 6
Florida,Ocala
jubinjr Offline OP
jubinjr  Offline OP
Joined: Oct 2017
Posts: 6
Florida,Ocala
How will i know if it isnt sparking inside the cylinder? And i have checked timing. Timing is correct


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