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Diesel F250 Problem, over my head

Discussion in 'Ford Trucks' started by mayhem, Apr 9, 2013.

  1. mayhem

    mayhem PlowSite.com Addict
    from Peru MA
    Messages: 1,016

    Girlfriend's stepfather has an 07 F250 with a powerstroke (I think its a 6.0, but there are no displacement badges that I can see so I really am not certain of the displacement).

    Started having warm start problems in the winter. It would start just fine cold, but if he ran into a store and came back out it would just crank and crank and not start till he let it cool for awhile. A friend of his at a garage diagnosed a bad FICM...I don't know what, if any, CEL codes he was getting at the time.

    Fast forward to now and he finally bought the replacement FICM core, had to remove the FICM, disassemble it and replace the circuit board himself, but was unable to get the three connectors plugged back in properly, which is when he asked me to help him out. I crawlied in there and got the connectors to click in, we did the voltage test key on, engine off and I got a solid 48v on the test terminal, but both his batteries were below 12v at the time and the truck wouldn't start and sadly the only jumper cables we had were this cheap 14 gauge cables and it just wouldn't pass enough juice to do much good.

    He managed to get it started awhile later and said it was running great, but then it started missing and the CEL came on. He took it back to the mechanic to scan the codes and the guy said the FICM must not be hooked up right.

    Now today we get back in there, disassembled the whole thing again and I can attest that all three of those connectors are definitely connected securely, I was able to grab each one and wiggled them all and they aren't coming off.

    Started it up, fired right up, but the CEL came back on and its definitely missing again. I scanned the codes and all I got was a P0261 and a pending P0261, indicating cylinder 1 low voltage.

    So I'm lost at this point as to where else to check for problems...do we need to compeltely remove the FICM and check anything...is there another common failure point we ought to check? Cracked wire in the harness? Bad injector? I'm not a diesel specialist so I'm not too sure where to go from here other than haul it off to the garage and pay the man, whih might be the best choice just to get the thing back on the road and working for him.

    Thanks for any help guys.
  2. jb1390

    jb1390 Senior Member
    Messages: 710

    Pull the connectors off and check for a bent pin.

    Also could be that the FICM failed prematurely, did the CEL come on immediately after he got it going?
  3. Turf Guy

    Turf Guy Member
    Messages: 52

    If I'm not mistaken the FICM's have to be programed at purchase or after install if dealer installed. I had a FICM go, bought a pre programed one from Ford. The 6.0lt diesels don't like low voltage from the batteries, make sure they are fully charged. Right now I'm replacing the injectors, one and two failed and I think that what may have affected the FICM. I had the famous miss you are referring to!
  4. Holland

    Holland Senior Member
    Messages: 605

    Ford offers a ficm two ways. One can be preprogrammed and the other done at the dealer. I personally dont get a half shell core, i always order a complete unit preprogrammed. Since you had trouble getting the conectors back together, pull everything apart and inspect. Just becasue the connector is secure doesnt mean you have a proper connection.
  5. Banksy

    Banksy PlowSite Veteran
    Messages: 3,113

    I believe I've heard of a bad HPOP be the cause for these hot no starts.
  6. clark lawn

    clark lawn PlowSite.com Addict
    from NE ohio
    Messages: 1,233

    Check pins on the FICM, also check the wires at the #1injector. Ohm out each wireand also check voltage at the injector. I have had IDMs (same thing) go out after just a few hundred miles
  7. tyler886

    tyler886 Member
    from RI
    Messages: 40

    Pay close attention to the FICM wiring harness for chauffing on the intake manifold near the FICM. Its a very common issue on 6.0s for the harness to create opens. As for the no start when hot, I would go out on a limb and say you have a couple cracked orings on the oil rails. The standpipes are known for spiltting orings, which cause HPO pressure to bleed off and give an extended crank. When the truck is giving a hard start when hot plug in your scan tool and check the ICP pressure. Youll need to see a minimum of 500psi to start the truck.