Another no start thread :/
Thread Starter
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Tuned
Joined: Sep 2011
Posts: 416
Likes: 0
Another no start thread :/
Hey guys,
So a buddy of mine bought my 95 powerstroke. About a month later it died on him driving down the road. Just shut right off. It has been having a funky issue before hand where when it was cold it would start and run for about 5 minutes then die. After cranking for a while it would start again and be fine for the rest of the day.
Things hes replaced:
HPOP
CPS
IPR
fuel pump
fuel filter
A friend of ours works at a ford dealer so they used the MAC MENTOR(i think) scan tool and all the injectors opened and checked out so its not the valve cover harness.
The cranking voltage is fine, the tac moves when it cranks and there IS a wait to start light. No smoke when turning over tho.
When the scan tool plugged in checking the pressure at the ICP it comes up to 10psi then stays there. What would cause this? There is no fuel in the oil or oil in the fuel so I dont think its the injector orings? But im not sure if that actually tells you that or not?
Wouldnt just one bad injector oring still let the truck start just run bad? Possibly the oil return check valve?
Please help we are pretty stumped and he is bumming that it still doesnt start.
So a buddy of mine bought my 95 powerstroke. About a month later it died on him driving down the road. Just shut right off. It has been having a funky issue before hand where when it was cold it would start and run for about 5 minutes then die. After cranking for a while it would start again and be fine for the rest of the day.
Things hes replaced:
HPOP
CPS
IPR
fuel pump
fuel filter
A friend of ours works at a ford dealer so they used the MAC MENTOR(i think) scan tool and all the injectors opened and checked out so its not the valve cover harness.
The cranking voltage is fine, the tac moves when it cranks and there IS a wait to start light. No smoke when turning over tho.
When the scan tool plugged in checking the pressure at the ICP it comes up to 10psi then stays there. What would cause this? There is no fuel in the oil or oil in the fuel so I dont think its the injector orings? But im not sure if that actually tells you that or not?
Wouldnt just one bad injector oring still let the truck start just run bad? Possibly the oil return check valve?
Please help we are pretty stumped and he is bumming that it still doesnt start.
Lead Driver
Joined: Oct 2003
Posts: 8,476
Likes: 37
From: Madison, WI
Bad ICP sensor? Disconnect it; IIRC, that will result in a default pressure value to the PCM, and it should at least allow it to start. Also look at the connector when you disconnect it. If you see oil, that means the sensor has internally failed.
Thread Starter
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Tuned
Joined: Sep 2011
Posts: 416
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We tried that too. The sensor seams to be working fine. Still didnt start with that unplugged.
Thread Starter
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Tuned
Joined: Sep 2011
Posts: 416
Likes: 0
Well what I'm saying is maybe it really IS only 10psi? What would cause it to have super low oil pressure? Because even if it was a bad wire opening the circuit that would still let it start just like if the sensor was unplugged. But it does nothing.
Thats why we are thinking the issue may actually be oil pressure.
Thats why we are thinking the issue may actually be oil pressure.
New User
Joined: Mar 2012
Posts: 11
Likes: 0
97 powerstroke with similar problems
I have a 97 7.3L with 160k light highway miles. I had the same problems just last week. Truck just shut of while driving. Threw it in N and it restarted right back up. Happened 2 more times, now wont start at all. Replaced Fuel Pump, Fuel Filter, CPS, then IPR, then HPOP and I am only getting like 250lbs oil pressure still. Got it to start today and it ran for a few minutes then died. Sounds like we have similar problems. I am starting to wonder if it is an electrical issue that is not showing up in diagnostic testing or there is something I am overlooking? Also should mention that my tach has not been working. It tends to every once and a while, but it has not worked in a long time and I have just been driving my truck back and forth to work (40 mile round trip). I had not anticipated this kind of problem and this is the only diesel I have ever owned so I am feeling pretty insignificant at this point. Any suggestions are appreciated. thanks
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Post Fiend
Joined: Dec 2009
Posts: 15,505
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From: Livoina,La
I have a 97 7.3L with 160k light highway miles. I had the same problems just last week. Truck just shut of while driving. Threw it in N and it restarted right back up. Happened 2 more times, now wont start at all. Replaced Fuel Pump, Fuel Filter, CPS, then IPR, then HPOP and I am only getting like 250lbs oil pressure still. Got it to start today and it ran for a few minutes then died. Sounds like we have similar problems. I am starting to wonder if it is an electrical issue that is not showing up in diagnostic testing or there is something I am overlooking? Also should mention that my tach has not been working. It tends to every once and a while, but it has not worked in a long time and I have just been driving my truck back and forth to work (40 mile round trip). I had not anticipated this kind of problem and this is the only diesel I have ever owned so I am feeling pretty insignificant at this point. Any suggestions are appreciated. thanks
Thread Starter
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Tuned
Joined: Sep 2011
Posts: 416
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Okay, so it needs 500psi at the CPS... we have 10 haha. Would a bad oil return check vavle (i think its called?) not allow it to build pressure?
If it was injector orings wouldnt oil and fuel be mixing? Or do I have that wrong?
If it was injector orings wouldnt oil and fuel be mixing? Or do I have that wrong?
Hotshot
Joined: Jun 2007
Posts: 10,008
Likes: 7
From: Austin, TX
If it is only building 10psi and the HPOP reservoir is full, the problem has to be either the HPOP itself, a stuck open IPR, or a very large HPO leak somewhere. I have seen IPR o-rings get bad enough for the truck to shut down and never start again.
Generally the symptoms of IPR o-rings will be that the truck will start cold, but once it's hot it won't restart. Let it cool down or give it a shot of ether and it'll start. I have seen them get bad enough to not all the truck to start cold either.
Failed injector o-rings will usually cause oil to be introduced into the fuel system.
If the IPR is stuck open it could do two things. One, not allow the HPOP to build pressure. Two, it could drain down the HPO reservoir. Check the reservoir, make sure it's full. If nothing else, pull the IPR apart and clean it.
Thread Starter
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Tuned
Joined: Sep 2011
Posts: 416
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The hpop and the IPR are both brand new.
I'll see if we can get ahold of a mechanical gauge. The one they had at the shop was broken.. go figure.
The hpop reservoir is full and if you pull the oil gallery plugs in the head there is oil there as well.
I'll see if we can get ahold of a mechanical gauge. The one they had at the shop was broken.. go figure.
The hpop reservoir is full and if you pull the oil gallery plugs in the head there is oil there as well.
Hotshot
Joined: Jun 2007
Posts: 10,008
Likes: 7
From: Austin, TX
Go to a hydraulic shop and get a mechanical gauge made up. You want a fitting to thread in place of one of the oil rail plugs, then a length of hose that will connect to that fitting (however much hose you want), then you want the gauge threaded on the end of the hose. I have all the sizes written down at home and I know I posted it up here what is needed to build the gauge setup. I will post it up in a little bit for you if you need it.
Edit: I know the fitting that threads into the oil rail is a #5 male o-ring boss, you need a minimum 3000psi working pressure hose and a 4000 psi gauge. Again, I'll try to either find my post or my list later and post it up.
Edit: I know the fitting that threads into the oil rail is a #5 male o-ring boss, you need a minimum 3000psi working pressure hose and a 4000 psi gauge. Again, I'll try to either find my post or my list later and post it up.
New User
Joined: Mar 2012
Posts: 11
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Blew Injector orings?
I just replaced the HPOP in case the one I had just put in was bad and the pressure is now dropped to 212.?. Before I replace my injector o-rings, I looked at the fuel and it does not look contaminated, and when the truck is running it doesn't blow much of any smoke??? Does that semi-eliminate the injector o-rings? I had my diesel mechanic friend look it over and he cannot find any visible leaks. I have a WTS light come on so ruling out, fuse #22 and heater bowl short and PCM right? And I cannot help wonder if the Tach sensor could be bad or something and could cause this problem....but that doesnt explain low oil pressure does it?