03 7.3 overhaul now hard warm start - Diesel Forum - TheDieselStop.com
'99 & up 7.3L Power Stroke Engine and Drivetrain Discussion of the '99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

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post #1 of 10 (permalink) Old 07-30-2019, 11:58 AM Thread Starter
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03 7.3 overhaul now hard warm start

2003 f-550 7.3 I did bearings,rings, reman heads from south Houston engines, 30% over reman on my injectors from diesel injectors so cal. after hard warm start issue I pulled valve covers and had one injector leaking oil from the top oil ring. pulled and noticed the bore was not real smooth so I cleaned up the surface installed new orings the visible leak quit but same start issue. I replaced the icp sensor, rebuilt the injector control pressure regulator the hpop is a reman that was in truck when I bought it used.

Today I unplugged the icp sensor while running and it didnt change anything but gave a check engine light.
Any ideas Im thinking injector orings might be losing oil pressure to the into the fuel end, I am seeing a bit of black and blue smoke when I step on it hard. It does have a ts 6 pos chip. I would rather not have to take it into a shop but thinking I also dont want to just start throwing money at it.

Thanks for any help!!
Rob


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post #2 of 10 (permalink) Old 07-30-2019, 12:30 PM
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So, the easiest first step would be to monitor the IC pressure and IPR duty cycle while cranking. If you're having trouble building 500 psi of pressure, then you've got a high-pressure oil problem. O-rings would be a logical place to start if nothing else was changed on the engine.
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post #3 of 10 (permalink) Old 08-09-2019, 12:47 PM Thread Starter
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Ok so I pulled and replaced all injector orings, no nicks cuts or anything. Replaced the hpop with a known good one, rebuilt pressure regulator and still having the same problem. Cold start 700 psi @ 39% Hot start 366 psi @ 65% with no start. Yesterday driving got up to a max of 3418 psi.
I did notice when I pulled passenger side injectors it drained the hpop oil reservoir into cylinders and the driver side didn't do that.
Im lost thinking either a bad rebuilt injector leaking internally or a bad head somehow. Those are the only thing that were changed in the rebuild ( different heads rebuilt my injectors)

Thanks for any help, Rob


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post #4 of 10 (permalink) Old 08-09-2019, 01:24 PM
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03 7.3 overhaul now hard warm start

The engine requires 500 psi to fire the injectors. There is a test to block one side at a time to isolate which bank is responsible. Still would have to narrow down to which injector. No way I can see the head itself being bad.


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2003 F-250 XLT Crew Cab 7.3L, Chrome BigTex Grille Guard, Quad pillar - 3 ISSPRO gauges (trans, pyro, boost) and DP-Tuner F6; Roush fuel pressure / temperature / oil pressure gauges, Ford Severe Duty AIS, 31 row 6.0 transmission cooler, ScanGauge II, Marinco mod, Walker BTM, Full Force Stage 1 injectors

IF MY BODY IS EVER FOUND ON A JOGGING TRAIL JUST KNOW THAT I WAS MURDERED SOMEWHERE ELSE AND DUMPED THERE
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post #5 of 10 (permalink) Old 08-10-2019, 09:29 AM Thread Starter
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I'm going to try unplugging the injectors and crank engine to see if any are dumping oil out the deflector.
Thanks!

From Swamps:Unplug injector connectors at both valve covers
- Crank the engine
- Observe spill spout of the injector and top of injector bore for oil leakage.
(No oil should be coming from the spill spouts or around the injector)
- Replace injector if oil leaks from spill spout or o-rings if leak is from injector bore.


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post #6 of 10 (permalink) Old 08-11-2019, 10:40 AM Thread Starter
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I unplugged all injectors 7 of 8 have oil coming out the spill spout with #1 being the worst and that's with the engine cold. So not happy but at least I may have found my problem.
Thanks again,
Rob


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post #7 of 10 (permalink) Old 08-11-2019, 03:30 PM
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Quote:
Originally Posted by robdog View Post
I unplugged all injectors 7 of 8 have oil coming out the spill spout with #1 being the worst and that's with the engine cold. So not happy but at least I may have found my problem.
Thanks again,
Rob
Sounds like it's time for a discussion with your injector rebuilder about warrantying those injectors. Hopefully they stand by their work.
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post #8 of 10 (permalink) Old 08-11-2019, 05:14 PM Thread Starter
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We will find out tomorrow morning they say we're here for you.


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post #9 of 10 (permalink) Old 08-12-2019, 12:45 PM Thread Starter
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Well they tried to tell me only the worst one was my problem, I gave them 7 and kept the one that didn't leak and told him I didn't want to do it again. Hopefully they go through all of them, tried to tell me some leakage is normal.


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post #10 of 10 (permalink) Old 08-20-2019, 08:36 AM Thread Starter
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Ok they repaired one and said the rest were good, so far seems to be starting much better. I'm still not happy that 7 of 8 were leaking but they said it was normal. Time will tell.
Thanks!!


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