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Apr 6, 2015 | 06:50 PM

ChancesDad

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Please Help

I have an '03 F350 6.0 that occasionally wouldn't start until it had cooled off for about 30 minutes. A friend of mine recommended adding a little marvel mystery oil to the oil system, I did research this and found no negative posts, but now it has been 2 hours and it still won't start. Any suggestions? Could i have added too much and thinned the oil out too much?

Apr 6, 2015 | 06:56 PM

dannyboy950

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Quite possibly, Marvel Mystrey oil is useuall used to loosen some thing stuck or overly thick. Not shure what it will do to 6.0 injectors. Never tried that on a 6.0

Apr 6, 2015 | 07:15 PM

texastech_diesel

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From: Breckenridge, TX

MMO is 3/4 mineral oil and 1/4 mineral spirits, aka paint thinner. It's not going to do a thing for you at all.
https://www.ford-trucks.com/forums/1...l#post15167023

No hot-restart begs for diagnosing an HPO leak. You need to post ICP, ICPV, IPR% while KOEO, cranking, and hot idle. On an '03 you also need to show IPR% while running on the highway, since that's the worst year for HPOPs.

Apr 6, 2015 | 07:25 PM

ChancesDad

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I'm draining and changing it now, it did start but not easily. I'll chalk it up as a bad learning experience. Thanks for not calling me a dumb a$$, lol.

P.S. HPOP was replaced 15,000 miles ago, all 8 injectors, FICM, IPR, ICP and pigtail were replaced 3500 miles ago.

Apr 7, 2015 | 08:37 AM

05F250DSL

Fleet Mechanic

Joined: Sep 2013

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Do you know if the feed or j tube which ever you call it got changed when the hpop got replaced? They have an o ring and fitting that can leak after time. It's the tube that goes from the hpop to the branch tubes.

Apr 7, 2015 | 06:23 PM

ChancesDad

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Yes, the tube was replaced the day after the HPOP.

Apr 7, 2015 | 06:33 PM

ChancesDad

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OK, I changed the oil last night, drove the truck home, about a 25 minute drive, and the truck again would not restart. I called my semi-local powerstroke repair facility and I was told it was either a failed/failing o-ring on top of an injector or my HPOP was going out again. I have read quite a few posts on here about no start when hot issues concerning a failing HPOP and probably 99% say their truck will just shut down after 30-45 minutes... and that is exactly what mine did when I had to replace the HPOP, but this time as long as I don't shut it off it will run pretty much forever, I drove it Monday morning an hour trip, left it idling for 30 minutes while loading out and an hour back, it was actually running for 4 hours with no problems, but, once I shut it off it took about 45 minutes for it to restart???