Detroit 14L... Mystery problem, no one seen before.

Discussion in 'Freightliner Forum' started by Prohemi500, Oct 29, 2015.

  1. AModelCat

    AModelCat Road Train Member

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    Well that would rule that out. You sure no one threw a plastic bag or something in there just to be a jerk? I was thinking maybe air was getting in to the fuel system? Maybe try plumbing a vacuum gauge into the inlet of the pump and run it as well as a pressure gauge on the outlet of the pump to see if something's goofy with the fuel system. Maybe check your intake piping for leaks as well.

    Never thought of that. Could be something to look into for sure.
     
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  3. BoxCarKidd

    BoxCarKidd Road Train Member

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    When it is throwing fits does it blow white- gray smoke out the exhaust which may be speratic. On cold start ,With low air pressure, does it surge and blow smoke but clear up at around 60-90? PSI? If you get a widget to plug into the barometric pressure sensor harness ,which tells the computer you are above 5,000 feet or so, and it runs 80% better ( which is for test purposes only). Or it starts showing SRS & or TRS codes but nothing related corrects it. Then after lunch or tomorrow it runs great, those are all signs for what I am talking about.
    When what ever shop leads you into replacing parts ask them if that will fix it? If they don't know hit the road. There is a lot of middle ground and I came to understand that engine harnesses should probably be replaced as regular maintenance at some point. If there is a Detroit Diesel dealer area in your area you might be better off there. This truck is duel draw duel return. Trash in one tank should not cause this. I would lean more toward Heavy Hauler's idea. Maybe search scanners diag tools, I thank cowpie noted an inexpensive one that would read codes plus some. With that you could see what is happening when it is cutting up. If you do not find that shout out to him (PM) he is pretty sharp on a lot of that.
     
  4. Prohemi500

    Prohemi500 Bobtail Member

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    No, that is what's so funny.. No smoke at all, nothing irregular on cold starts. Truck acts perfectly fine until it decides to act up, then it's good for awhile again..
     
  5. Prohemi500

    Prohemi500 Bobtail Member

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    I spent most of the day digging into the wires on the truck as I am leaning towards an electrical problem of some kind. I found what I believe to be the power and ground wires that power the ECM. There is a separate ground and 12v wire that run in two separate looms from the frame and the battery box to starter area. The wires looked fine, but I think I will replace them anyway. What's interesting is I found the ground wire from the frame to the cab and the cable is held to the cab with a 5/16 bolt which I thought was odd.. On the inside of the cab, the nut that holds the bolt also held 4 or 5 grounds coming from under the dash. The ends of the wires were all somewhat corroded and where they met the floor of the cab was corroded as well.. I cleaned all the wire ends and the floor, installed a new bolt and cleaned the cable that goes to the frame. Maybe these grounds have something to do with ignition?? I did notice that one or two of the grounds went to the rear of the cab towards the fuse panel and wabco ABS box. Maybe these grounds being cleaned will help.. Sure can't hurt! However, I still can't get injectors and the wabco abs box off my mind. Maybe someone can inform me if the abs box that got wet has any control over my engine or ignition? I think the wabco box may use the datalink to communicate through?.. Could that be a problem? I'm just grasping for straws here... Thanks to all you who have offered your opinions!!!
     
    Last edited: Oct 30, 2015
    Reason for edit: post reply button is too close to what your typing
  6. heavyhaulerss

    heavyhaulerss Road Train Member

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    1 day my truck went into engine shut off mode. every code came up, about 13 codes. my shop guy said the ground to the e.c.m. looked good. took it off & under close scrutiny still could see nothing wrong, but made a new one anyway. put in on. that was the last time I saw any more problems. 4 years ago now.
     
  7. Prohemi500

    Prohemi500 Bobtail Member

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    That's encouraging heavyhaulerss, as my grounds could definitely be seen with some degree of corrosion on them. I also forgot to mention that my speedometer will never reset to 0 when the gauges cycle.. It's always stops on 12 mph. Occasionally the tach will be 500 rpm too high as well.. But will reset to 0 if I turn the truck off and start it again.. I don't think this has anything to do with the problem I'm trying to fix, (who knows) but it is aggravating! Maybe these grounds I cleaned will help the problem and/or it might require me replace the speedo and tach.
     
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