Destroyed a 7.3 - can't get to run with new motor now :( - Ford Powerstroke Diesel Forum
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Old 03-09-2009, 06:11 PM
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Destroyed a 7.3 - can't get to run with new motor now :(

Blew out both sides of the block when a powder metal rod came apart in the bottom end.

Bought new long block and put the motor together. New innercooler, new 38R Garrett, high pressure oil pump & IPR both changed twice, cam position sensor changed out 3 times, low pressure pump changed once.

Engine was a new longblock, put together by us (hubby is a shop teacher and experienced mechanic).

The weird thing is, we'll do something like change out the HPOP, and it'll seem to work for 3-4 days - runs fine. THen will begin this starting and dying thing again - inconsistent.


PROBLEM: When starting, will crank over and over, won't start. Crank over again, will fire then die. 3rd time's the charm, will start and run. Sometimes it'l fire and die the first time, then run fine. Sometimes, it won't start at all and when you look in the hpop reservoir, it's EMPTY! If you manually fill it, it will start right back up.

When cranking and it won't fire, the gauge on the dash doesn't move at all. Once it starts, the needle will move. My other 7.3l - the needle starts to move as it's cranking over.

QUESTIONS: [*]Does the low pressure oil sending unit have anything to do with it not wanting to start? [*]If the low pressure sending unit doesn't sense low pressure, would this cause it to die after firing? [*]Any chance it could be some sort of relay or sensor that's intermittent?

Stumped and frustrated!!! Love the truck, but ready to light a match and buy a Chevy!

HELLPPP!!!

Tammy

Yes - I've posted this in a couple of different places hoping to find my saving grace!!!
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Old 03-09-2009, 06:14 PM
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I believe if you dont have LPO the computer wont let it start. You need to have it hooked up to a computer while cranking to see what its not getting...
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Old 03-09-2009, 06:19 PM
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We've hooked up a scan tool to it while cranking, just haven't paid attention as to whether the low pressure shows or not - will do that tomorrow.

We realize we aren't getting oil back into the hpop, just not sure why. And we are frustrated beyond belief, so any little idea is most helpful.

Thanks!

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Old 03-09-2009, 06:21 PM
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either your LPOP is not functioning correctly, or your pickup is clogged or loose or something.

Is it a reman? I would def start with the Lpop. its mounted on the end of the crank.
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Old 03-09-2009, 06:38 PM
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Aren't there check valves in the HPOP? Maybe they are bad and thats why the res. is empty.
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Old 03-09-2009, 06:39 PM
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i think the only check valves are in the early model IPRs. like 95-96 models.
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Old 03-09-2009, 06:39 PM
JJR JJR is offline
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Friends excursion does the same thing when it sits for an extended time (like overnight). Once it gets running it runs perfect. I suspect something with the hpop and it bleeding off. Anyone know if there is a check valve or something that would leak off and cause this? If so where is it located.
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Old 03-09-2009, 06:42 PM
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Quote:
Originally Posted by Jake View Post
Aren't there check valves in the HPOP? Maybe they are bad and thats why the res. is empty.
Thats what I was wondering. Glad you said it first so I dont look bad if its wrong.
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Old 03-09-2009, 07:07 PM
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One thing we HAVE done is - before trying to start, we've looked in the hpop reservoir, FULL. Crank it over and over, fires, starts and dies. look in the hpop reservoir, EMPTY.

????? Like there's no return happening back to the hpop reservoir - which, by my understanding is the low pressure pump sending it back. ??

check valves - good question.

Thanks for all the thoughts - we are willing at trying just about anything at this point!

Tammy
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Old 03-10-2009, 09:34 AM
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If it was lack of oil in the hpop then why does it turn over again after the initial stall? I have the same problem but mine will turn over after the stall and run fine after start up. ALSO.... If I anticipate the stall and feather the throttle at startup, I can help it past the stall phase (about 2-3 seconds). can anyone else concur with this that has the same problem??? This only happens to me in colder temps when the truck sits over night.

My guesses:

1. Cold oil (thick)
2. Idle adjustment (can you adjust idle at startup settings?)
3. Glow plugs heat initial fuel but the stuff comming in is cold and has a lower flash point.
4. I don't have a clue and sound like an idiot grasping for straws

Most likley #4 so help me out if someone figures this out.
Thanks for having a laugh at my expense.
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