Start up problems

Discussion in 'International Forum' started by kev2809, Aug 27, 2020.

  1. kev2809

    kev2809 Light Load Member

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    little back ground...

    truck is a 94 international 9400 with n14 cummins. earlier this year truck was randomly shutting down, it was showing cam sensor code and coolant sensor code. replaced both and ran fine for a few weeks and had the same shut down problem. digging around i found the fuses by the ecm loose and half plugged in. plugged them in and havent had an issue since..this was February.

    so now the current problem. i ran the truck all last week including saturday..and was to go back to work Tuesday. over the weekend my keys got misplaced, so i had a locksmith make new keys. also drained my coolant and replaced with new coolant. when i got my keys, truck just cranks and cranks and cranks, like it wants to turn on. sprayed a shot of starting fluid in the air filter and it cranked and ran fine. took it all up and down the road no issues. shut it off..wont turn on without starting fluid.

    so today, i bought a check valve..the one that goes to the ecm coolant plate (it never even had one there), replaced filter, replaced return line hose, replaced fuel shut of solenoid. all that and nothing...still wont start without ether. also noticed code 422 flashing on the dash which is coolant sensor.
     
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  3. baha

    baha Road Train Member

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    If thats the LOW coolant sensor you may have to buy a new one or try cleaning both sides of plug in?
     
  4. Heavyd

    Heavyd Road Train Member

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    Coolant sensor code won't prevent it from starting. Starting issues does sound like a fuel priming issue. You might have dry rotten fuel lines between the engine and tank sucking some air and allowing drain back. You can make up a new test line and just connect to the fuel filter housing inlet and just run the line into the fuel tank, get it running and then let it sit and see if starts ok or not later on. If not, the fuel pump itself might be getting tired.
     
  5. kev2809

    kev2809 Light Load Member

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    yup i been reading about the lines. i replaced all them this morning..well because they were old and tired looking anyways...200 bucks at least i get peace of mind. but no change. even pulled the check valve on the diesel pump and it seems fine. blew compressed air through it and it only let air flow on one side so im guessing its working. did notice that new fuel shut off solenoid leaking from the 12 volt stud after i put it back on

    that coolant sensor is only 6 months old..along with the cam sensor..dont think that would be it?

    im running out of ideas. truck runs so good after i do get it started..im stumped and running out of funds lol
     
  6. kev2809

    kev2809 Light Load Member

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    so to sum it up.....new suction line from the tank to the cooling llate..new line from the cooling plate to the filter. new return line from the tank to the brass fuel lines. (so basically all new lines, i deleted EVERYTHING running to the passenger tank as i do not use it) new fuel filter. new cooling plate check valve. inspected diesel pump check valve and seems fine. new fuel pump solenoid. filled up tank today to eliminate pickup tube issues in tank (had that issue before as well)
     
  7. Heavyd

    Heavyd Road Train Member

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    To rule out the pump, you would need to put a mechanical pressure gauge on it to see if it is making any pressure when cranking.
     
  8. kev2809

    kev2809 Light Load Member

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    pump was rebuilt 3 years ago but i guess it could still be the problem. what exactly does a shot of ether to the filter do? it fires off the fumes instead of waiting for the pump to shoot diesel up..basically bypassing the pump, initially?
     
  9. kev2809

    kev2809 Light Load Member

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    i pulled the pump off myself, taking it to the shop that rebuilt it last time a d hes gonna bench test everything. ill post the results
     
  10. Heavyd

    Heavyd Road Train Member

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    During crank, the pump gears turn to pump fuel into the system. As the pump gears wear, fuel simply leaks between the pump teeth enough to prevent proper pressure build up. The slight wear also causes it lose prime as fuel is allowed to leak back. During crank, the pump speed just isn't fast enough to over come the minor leakage that is occurring. When you give it a shot of ether, the engine speed kicks up enough, the pump spins faster and this creates the necessary fuel pressure to finally start the engine.
     
    AModelCat and 062 Thank this.
  11. 062

    062 Road Train Member

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    If the pump isn’t the problem, then pay attention to the oil pressure. I don’t think the ecm will let the injectors fire with less than 20psi.
     
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