Died. Now no start
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Senior User
Joined: Apr 2012
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From: Atlanta, GA
Died. Now no start
So on my last off roading trip, I was trailering my jeep back home. It's trailered one ton jeeps 300 miles round trip multiple times and this time I drove about 100 miles round trip. As I was pulling in front of my house after the trip, it died. I thought I had stalled out...even though I knew I hadn't. I've been having a hard time keeping the wire from the battery to the starter connected. Re-connected it and tried to start it again. Nothing...turns over non-stop. Thought maybe the battery was too low to start the truck, but I jumped it off and it still just turned over. It has a fresh oil change and fuel filter as well as a fresh tank of diesel and additive. Anyone have any ideas? I need the truck to start so I can move the trailer out of the way...thanks everyone
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From: Celaya, Gto. MX
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From: Amarillo, TEXAS!
Is the IPR still secure, with the spacer on and the nut tight? Checked your fuel pressure? Do you have any way to monitor the ICP, IPR duty cycle and injector pulse width while cranking? AE or Torque Pro perhaps? Probably won't make a difference, but you could try starting it with the ICP sensor disconnected and see if runs.
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Senior User
Joined: Apr 2012
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From: Atlanta, GA
Is the IPR still secure, with the spacer on and the nut tight? Checked your fuel pressure? Do you have any way to monitor the ICP, IPR duty cycle and injector pulse width while cranking? AE or Torque Pro perhaps? Probably won't make a difference, but you could try starting it with the ICP sensor disconnected and see if runs.
Lead Driver
Joined: Jun 2004
Posts: 6,317
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From: Amarillo, TEXAS!
It may not be fuel pressure, but it's a good idea to check it first to rule it out. There are several parameters that have to be met before the PCM sends a fuel delivery command signal to the IDM. Minimum ICP 500 psi, minimum RPM 100, minimum voltage 7.0. When those parameters are met, the fuel injector pulse width should come up somewhere between 1.0 and 6.0 milliseconds to fire the injectors. Note: if you get an RPM reading on a scan tool while cranking, the CPS is working.
Unplugging the ICP sensor causes the PCM to use an inferred pressure table and makes the 500 psi minimum irrelevant. If you have good batteries, good fuel pressure, and disconnect the ICP sensor and the truck still won't start, it's more than likely high pressure oil related; IPR, HPOP, or leaking o-rings. Of those three, a bad HPOP is the least likely. IPR problem is most likely, but before I did anything I'd check the HPO pressure while cranking either with a known good ICP sensor and scan tool, or a 3,000 psi mechanical gauge.
Unplugging the ICP sensor causes the PCM to use an inferred pressure table and makes the 500 psi minimum irrelevant. If you have good batteries, good fuel pressure, and disconnect the ICP sensor and the truck still won't start, it's more than likely high pressure oil related; IPR, HPOP, or leaking o-rings. Of those three, a bad HPOP is the least likely. IPR problem is most likely, but before I did anything I'd check the HPO pressure while cranking either with a known good ICP sensor and scan tool, or a 3,000 psi mechanical gauge.