Another 7.3 not starting...
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Senior User
Joined: Mar 2003
Posts: 489
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From: Western Kentucky
Not sure about the flow, but we did empty the bowl and verified it refilled.
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Senior User
Joined: Mar 2003
Posts: 489
Likes: 1
From: Western Kentucky
I had experience with that one on my son's truck, but no luck on this one.
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Senior User
Joined: Mar 2003
Posts: 489
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From: Western Kentucky
Engine oil full? Make sure you didn't damage an o-ring and got the tin nut back on right when you swapped the IPR. Truck's not going to start if you're only seeing 50 psi of high pressure oil. Does IPR duty cycle go up to 65% while cranking? Unplugging the ICP sensor won't hurt and is worth a try.
Post Fiend
Joined: Mar 2007
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From: Texas
Oil was changed even though it only had 2600 on previous oil. I haven't checked the duty cycle on the IPR. We pulled the IPR from my truck which is good, but no luck. We have unplugged the ICP. We are quickly running out of things to try. How likely is it that the HPOP is bad? I would think it was more likely a sensor or something else. When it quit, it just died and has never tried to restart. No symptoms before then.
Is the reservoir staying full? You'll want to make sure this isn't a LP pump failure or a cracked pick up tube.
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Senior User
Joined: Mar 2003
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From: Western Kentucky
The way to check is to disconnect one head from the HPOP (block off the line) and stick a pressure gauge in the head getting oil and monitor pressure while cranking, the do the same thing with the other head. That will make sure you don't have an issue in one of the rails dumping the pressure.
Is the reservoir staying full? You'll want to make sure this isn't a LP pump failure or a cracked pick up tube.
Is the reservoir staying full? You'll want to make sure this isn't a LP pump failure or a cracked pick up tube.
Do you know what size those fittings are?
Post Fiend
Joined: Mar 2007
Posts: 26,966
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From: Texas
Sorry, no. But with all the folks who have installed a crossover, you should be able to get an idea what size fitting you need for the gauge.
I'll bump this back to the top
I'll bump this back to the top
Junior User
Joined: Oct 2008
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It sounds like my '01 - everything looked OK, no codes, no start, no injection pressure. It turned out for me to be the UVC harness plugs came loose. An injector buzz test gave the codes. I reconnected, runs fine. Apparently if the computer doesn't see good connections to the injectors, it won't command for HPOP pressure.
Thread Starter
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Senior User
Joined: Mar 2003
Posts: 489
Likes: 1
From: Western Kentucky
It sounds like my '01 - everything looked OK, no codes, no start, no injection pressure. It turned out for me to be the UVC harness plugs came loose. An injector buzz test gave the codes. I reconnected, runs fine. Apparently if the computer doesn't see good connections to the injectors, it won't command for HPOP pressure.
He hooked a gauge to the HPOP last night and had 3000psi. So it looks to be good. Can't work on it tonight, so it will be Thursday before we check the harness.
Fleet Owner
Joined: Jun 2004
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From: Rio Rico, AZ.
When it quit, did it stutter and taper down or just shut off?