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6.0 will not start!
Ok so, early this year I purchased a 2005 Superduty with a 6.0. When I bought it, the motor started quickly at any temperature. Since then the truck has required more and more cranking time to fire off, especially when at operating temperature. Eventually, I was stranded when it wouldn't start back up when hot.
So I took action, I heard that the STC fitting breaks and the Dummy plugs/Standpipes leak. I replaced both, expecting for the truck to be fixed but of course it wasn't. After that the truck just sat for awhile because it wouldn't start regardless of the temperature, unless I used the spray.
I changed the oil from wintertime 5W-40 Rotella T6 to summertime 15w-40 Rotella T. The new oil helped the engine start when it was dead cold, after 20+ seconds of cranking. This lead me to believe that the hpop was weak/dead so I did some tests. I did the air leak test on high pressure system, and that checked out. The screen on the IPR valve was clean too. Also I have base oil pressure from the lpop when cranking.
So today I replaced the hpop, and when I got back from a short drive after the installation it wouldn't start back up. So guys, can you help me? I've heard its possible for there to be air in the system still, and that's what I'm hoping is it.
Sorry for the long post.
2005 F250XL, 6.0, 4x4, 6 speed - Sold!
Now driving - 2004 Silverado 2500HD Duramax, and couldn't be happier!