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  #1  
Old 12-28-2013, 04:06 AM
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03 6.0 hard start rough idle low power no codes

Trying to help my buddy get his truck running right, heres what we got

2003 F350 6.0. Truck has 170xxx miles, first off is it takes a bit of persuasion to get it to start and stay running after cranking for a good few seconds. Trys, Trys, Trys then finally catches like a hard Loping CAM for a few seconds, then tones down a little and begins to slowly warm up.

Park or neutral, truck runs rough but gradually pressing pedal down will smooth it out, seems to build boost, no hissing. Truck will barely move until its showing temps are almost at full operating.

Still after warming up and running rough, putting it into gear, low power until roughly 1500 rpms, and unless it downshifts on its own or stomping on it a few times, it will not pass this rpm range, if it does down shift it jumps to roughly 2300 rpms.

going to try and start off with checking fuel filters.

Help.
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  #2  
Old 12-28-2013, 04:18 AM
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Re: 03 6.0 hard start rough idle low power no codes

Check the ficm voltage, good videos about that on youtube


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  #3  
Old 12-28-2013, 10:47 PM
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Re: 03 6.0 hard start rough idle low power no codes

If the FICM is good then you most likely have injector issues, stiction.
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  #4  
Old 12-29-2013, 05:49 PM
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Re: 03 6.0 hard start rough idle low power no codes

I had/have the exact same problem with my very early 2004. +1, start by checking the FICM voltage. Mine was low, so I had that rebuilt. If that doesn't remedy problems, it could be a stiction problem, but I think it's very likely to be a high pressure oil problem (IPR, HPOP, etc.).

I'm in the process of installing a new HPOP and oil cooler, and fixing a number of problems at the same time.

Good luck!
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Old 12-29-2013, 11:40 PM
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Re: 03 6.0 hard start rough idle low power no codes

If it still runs the HPOP is probably still good, every truck I have ever seen that needed a HPOP had less than about 70 psi of ICP, which I figured was base oil pressure.
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Old 12-30-2013, 02:19 AM
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Re: 03 6.0 hard start rough idle low power no codes

Apparently, at least from what I've read, early 6.0 HPOPs will excessively leak at the seal causing pressure and hard start issues. Mine really didn't have any problem starting hot, but after sitting for eight hours to a day the sump would drain causing one heck of a hard time getting it started.
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Old 12-30-2013, 11:45 AM
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Re: 03 6.0 hard start rough idle low power no codes

Quote:
Originally Posted by Michipicoten_SuperDuty View Post
Apparently, at least from what I've read, early 6.0 HPOPs will excessively leak at the seal causing pressure and hard start issues. Mine really didn't have any problem starting hot, but after sitting for eight hours to a day the sump would drain causing one heck of a hard time getting it started.
Did you change the HPOP? and did that fix it?

Truck will barely move until its showing temps are almost at full operating.

^^ That statement sounds like injectors.
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Old 12-30-2013, 04:19 PM
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Re: 03 6.0 hard start rough idle low power no codes

Quote:
Originally Posted by toolmangary View Post
Did you change the HPOP? and did that fix it?
It's in progress right now, so no, I don't know for sure if it fixed the problem. In addition to the no power until operating temperature thing, I was also having very hard cold starts, an increasing loss of power at operating temperature, and a frequent P2290 code. I do know my sump was draining when parked for some time, and I believe it was draining through the pump seal.

That said, my FICM did need service (37 VDC when running). Getting that fixed helped a lot with the lack of power when cold.
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