Diesel Forum - TheDieselStop.com

Diesel Forum - TheDieselStop.com (https://www.thedieselstop.com/forums/)
-   '99 & up 7.3L Power Stroke Engine and Drivetrain (https://www.thedieselstop.com/forums/f24/)
-   -   03 7.3 overhaul now hard warm start (https://www.thedieselstop.com/forums/f24/03-7-3-overhaul-now-hard-warm-start-656272/)

robdog 07-30-2019 11:58 AM

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

RT 07-30-2019 12:30 PM

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.

robdog 08-09-2019 12:47 PM

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

RT 08-09-2019 01:24 PM

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.


Sent from my iPad using Tapatalk

robdog 08-10-2019 09:29 AM

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.

robdog 08-11-2019 10:40 AM

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

klhansen 08-11-2019 03:30 PM

Quote:

Originally Posted by robdog (Post 4665782)
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.

robdog 08-11-2019 05:14 PM

We will find out tomorrow morning they say we're here for you.

robdog 08-12-2019 12:45 PM

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.

robdog 08-20-2019 08:36 AM

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!!


All times are GMT -5. The time now is 11:04 AM.

Powered by vBulletin® Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.

vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
User Alert System provided by Advanced User Tagging (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.

 
For the best viewing experience please update your browser to Google Chrome