No start!!!
Thread Starter
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Laughing Gas
Joined: Oct 2009
Posts: 831
Likes: 2
From: Vacaville, CA
No start!!!
Fired the truck up this morning just fine, idled for 10seconds and shut down. Now no start. Building 0 ICP!!! Swapped IPR, checked voltage to IPR (12.2v), ICP sensor showed signs of oil, cleaned connector. Already have a call in to Terminator to discuss further. Just wondering if I am missing anything here. Ideas?
Lead Driver
Joined: Jun 2004
Posts: 6,362
Likes: 593
From: Amarillo, TEXAS!
Engine oil full? HPOP reservoir full to within an inch of the top? Will it start with the ICP unplugged? Voltage to the positive pin of the IPR should always be the same as system voltage, the PCM controls the ground side of it.
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Laughing Gas
Joined: Oct 2009
Posts: 831
Likes: 2
From: Vacaville, CA
Engine oil full, haven't checked hpop yet (thanks for the reminder). ICP checked with snap on scan tool, could put it on AE too if I need to. Battery voltage was 11.7v after a couple cranks, positive pin on IPR was what I measured. Not sure how or if you can check the "pulse" side of the IPR connector. Haven't tried with ICP disconnected. That would just put it in "limp mode" though, shouldn't affect 0 pressure issue.
Lead Driver
Joined: Jun 2004
Posts: 6,362
Likes: 593
From: Amarillo, TEXAS!
If the sensor is toast but not shorted or open, it's possible the PCM may not realize the sensor is bad and still trust the reading rather than using inferred values. If that's the case, the PCM will never send a fuel delivery command signal to the IDM. Granted it isn't likely, but it's possible. If you can log ICP, IPR duty cycle, injector pulse width, RPM and voltage while cranking it might shed some light on it. Were there any codes present? You replaced the IPR with a known good part, right?
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Laughing Gas
Joined: Oct 2009
Posts: 831
Likes: 2
From: Vacaville, CA
IPR came off a new running motor (swapped for dual pumps). I need to put it on a charger now, then I could get some better readings with AE. I don't remember IPR replacement taking much "purging" to get it to fire, but possible?
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Laughing Gas
Joined: Oct 2009
Posts: 831
Likes: 2
From: Vacaville, CA
Soft codes were intake air heater voltage low (AIH delete) and fuel level sender fault (gauge will fault occasionally), fuel pressure builds up fine.
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Lead Driver
Joined: Jun 2004
Posts: 6,362
Likes: 593
From: Amarillo, TEXAS!
It could be an HPOP failure, but that's truly pretty rare. It could be a blown injector o-ring, too. If you have a mechanical gauge, some extra STC fittings and a cap, you can pop the HPO lines off the heads, plug one line and put the gauge in the other line. Then just crank it over and see what the pump is actually putting out.
It's a Van Gogh
Joined: Feb 2010
Posts: 7,813
Likes: 1,335
From: Elk Grove, CA
Heck to confirm 0 psi hpop, just pull the line off the head and see if it squirts when you crank it. 0 won't squirt. ICP unplugged should command 2100 psi or so, that will squirt plenty.
Just to cover all the bases, how are the fuses?
Good luck Chris!
Just to cover all the bases, how are the fuses?
Good luck Chris!
Thread Starter
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Laughing Gas
Joined: Oct 2009
Posts: 831
Likes: 2
From: Vacaville, CA
I thought electrical too David... Just not sure what fuses to check. Joey suggested pulling the pump and " bench testing" it. I like the idea of pulling the line off the head.
