Strange random no start.

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Mar 27, 2016 | 01:38 PM

TheBlueMule

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From: Erie Pennsylvania

Strange random no start.

Hey guys,

I have a 2004 6.0 that has been pissing me off to no end lately. I has a random dying/no start problem. If it idles for ten minutes, it'll die sometimes. And if I drive it and shut it off, it won't restart sometimes. I just drove it three hours on Friday, shut it off and it restarted immediately. Drove it around town all weekend and it started fine every time. Now driving it home and stopped for fuel 45 minutes in, and it won't start. I have all sensor readings in spec except for I have no ficm sync while cranking. I have about 5k miles on new hpop, injectors, ipr valve, icp sensor, oil rail rebuilds, stand pipes, ficm and engine harness and injector harness. No codes either. If it sits for a couple hours it'll start fine. I've wiggled as many wires as I can and it still won't start. I have rpm while cranking on my edge too. Don't know if that would rule out crank sensor or cam sensor.

Thanks guys

Mar 27, 2016 | 06:48 PM

TheBlueMule

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From: Erie Pennsylvania

Quote:

Originally Posted by TheBlueMule

Well it just died on me while driving. Truck had just sat for 4 hours. Won't restart but also now have p2617. Cleared it, cranked it again and code came right back. Guess I'll try a new crank sensor. Any tips on changing one without removing a/c pump??

Mar 27, 2016 | 10:35 PM

Restlesswildman

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From: SW Ohio

I had similar issue a year ago. Mine turned out to be the crank sensor. I chased that issue for months before it finally stopped me dead and it went to the shop.

There are 2 things that give you a a no FICM synch. The Camshaft sensor and the Crank sensor. You have the crank sensor code so it is either the sensor or the harness. Hopefully it is just the sensor. If it is in the harness the only way to fix it from what I have read and been told is to replace the harness since the crank sensor pig tail is a shielded wire setup.

Unfortunately you will have to pull the a/c compressor to do the crankshaft sensor. You may also want to replace the camshaft sensor just to cover your bases since they work in unison.

Mar 27, 2016 | 10:36 PM

Restlesswildman

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From: SW Ohio

try wiggling the harness going to the sensor and see if it starts. I had luck with that once!

Mar 27, 2016 | 10:45 PM

TheBlueMule

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From: Erie Pennsylvania

Thanks guys! I replaced the whole harness 5k miles ago and wiggling the wires didn't seem to change a thing. So I guess I'll be changing the sensor. And I will be doing both of them to just be done with it.....hopefully.

Thanks guys!

Mar 28, 2016 | 07:22 AM

run6.0run

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From: Kansas City MO

You can get the crank sensor out without removing the ac compressor. It can be done.

Apr 1, 2016 | 07:11 PM

TheBlueMule

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From: Erie Pennsylvania

Hey guys,

Just changed the cam sensor and crank sensor. Checked wires (even though it's a brand new ford harness) and plugs. It was a PITA on both sensors but got it done. Went to go start it........and nothing. No start and no ficm sync no codes. Any more ideas before light this thing on fire?? Lol

Thanks,
The blue mule