My 6.0 won't stay running - Ford Powerstroke Diesel Forum
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Old 02-13-2014, 08:52 PM
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My 6.0 won't stay running

Hello all, thank you for allowing me to join your forum. I have owned my 05 F250 6.0 powerstroke for about 6,000 miles now. The other day I changed my oil for the second time since owning this truck. First time went smoothly, second time I accidentally broke the top off the filter cap trying to get my socket off. I had to move the truck a very short distance, didn't think this would be a big problem but lost a lot of oil doing this and of course my "check gauges" light came on. I also live in Northern Colorado where this time of year is single digit weather. I left the truck unplugged for a couple of days while the truck sat waiting for me to get a replacement cap. I got an aftermarket NAPA cap and it seamed to not screw in quite as snugly as but it tightened down just fine. I haven't replaced any oil and my dip stick does not register even at the low mark. So here is the problem; the truck has a hard time starting, when it does start it won't stay running. Is this just because I am low on oil or I know it could be fuel jelling also? Could there be something a lot worse from moving the vehicle with no oil pressure? Thanks in advance.
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Old 02-25-2014, 09:23 AM
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Bump?

I don't know the answer, but perhaps someone will know this. Myself, I am just learning all the tricks a 6.0 has yet to hit me with.
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Old 02-25-2014, 09:29 AM
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Replace the oil filter cap with oem some aftermarket caps cause oil pressure problems. Also fill the thing with oil your injectors run off high pressure oil, no oil= no fuel either.

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Old 02-25-2014, 09:37 AM
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I would think that just cranking it a bit would deliver the necessary oil.

Is there any sort of oil bleeding procedure to get the high pressure fuel pump to prime?
Or...is there some way to determine that it is not getting enough oil pressure to operate properly?
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Old 02-25-2014, 07:25 PM
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Stop cranking your truck if the dipstick does not say your oil level is good. It's that simple if you sprayed oil out of the oil filter cap you could have ran the engine almost dry of oil.
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Old 02-25-2014, 07:30 PM
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Correct. Your injectors are hydraulically actuated( driven by high pressure oil) if your don't have enough oil in the crank case, it won't build enough high pressure oil to fire the injectors. The high pressure oil pump is fed by the low pressure, or engine oil pump located on the crank. The fuel pump only supplies fuel...not oil. That's what the engine oil pump(lpop) and high pressure oil pump(hpop) are for.

Your truck will not run with not enough oil. Its really a good thing actually , you cannot destroy a 7.3 or a 6.0 due to lack of oil pressure like you could a gas engine....its not good to run it low. Just fill it back up and then try to start. It's gonna run rough until all the air is bled through the system and through the injectors

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Old 02-25-2014, 07:37 PM
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Quote:
Originally Posted by HVAC SuperTech View Post
Correct. Your injectors are hydraulically actuated( driven by high pressure oil) if your don't have enough oil in the crank case, it won't build enough high pressure oil to fire the injectors. The high pressure oil pump is fed by the low pressure, or engine oil pump located on the crank. The fuel pump only supplies fuel...not oil. That's what the engine oil pump(lpop) and high pressure oil pump(hpop) are for.

Your truck will not run with not enough oil. Its really a good thing actually , you cannot destroy a 7.3 or a 6.0 due to lack of oil pressure like you could a gas engine....its not good to run it low. Just fill it back up and then try to start. It's gonna run rough until all the air is bled through the system and through the injectors

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100% spot on and might mention that it takes a good 30 seconds of cranking or more sometimes to fill the oil rail again after it's been emptied.

Once you have filled your oil if after a few crank cycles you still dont get it to fire off you may need to check your ICP pressure. If the truck does not fire unplug the ICP on an 05 it should be on the passenger side valve cover right behind the glow plug controller and the alternator. If the truck fires your ICP sensor is probably bad or the hpop is not creating the proper pressure and you can diagnose further.

Either way come back and let us know what happens.

And by the way
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Old 03-17-2014, 01:44 PM
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OK, So if you replaced the oil filter cap, and not the filter as well, you could have a cap/filter mismatch. If the oil filter and its cap together are not the correct length, they will not depress the check valve in the bottom of the filter housing, and the engine will not start. Get a factory filter and cap, or an aftermarket filter/cap combo, fill the engine to the proper oil level, and retest.
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