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2012 386 cranking before start

Discussion in 'Ask An Owner Operator' started by Jrry, Nov 29, 2020.

  1. Nov 29, 2020 #1
    Jrry

    Jrry Bobtail Member

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    Jun 4, 2016
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    I have 2012 peterbilt 386. I have problems with it cranking up. It takes couple tries to get it started then drive for couple hours turn it off and again takes couple time to start. I have change the starter and sent it back to have it checked and came back good. Replace new batteries, alternator, ignition switch. Themechanics can’t find the problem. Has anyonehad the same issue with their trucks. I’llappreciate any info.
     
    Jrry, Nov 29, 2020
    Jrry, Nov 29, 2020
    #1
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  3. Nov 29, 2020 #2
    xsetra

    xsetra Road Train Member

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    What motor?
    What do you mean.
    Key on turns over a couple times and starts or.
    Key on, and it turns over a couple times, no start. Turn key off and try again, then it starts?

    Check for fuel leaks, losing prime.
    Check grounds.
     
    xsetra, Nov 29, 2020
    xsetra, Nov 29, 2020
    #2
  4. Nov 29, 2020 #3
    Jrry

    Jrry Bobtail Member

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    Jun 4, 2016
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    Jrry, Nov 29, 2020
    Jrry, Nov 29, 2020
    #3
  5. Nov 29, 2020 #4
    Old Man

    Old Man Road Train Member

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    If it cranks good, then it is probably fuel related, check valve or leak letting fuel drain and then you have to crank to get pressure back.
     
    Old Man, Nov 29, 2020
    Old Man, Nov 29, 2020
    #4
    shatteredsquare Thanks this.
  7. Nov 29, 2020 #5
    HillbillyDeluxeTruck

    HillbillyDeluxeTruck Road Train Member

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    Definitely losing prime. Before cranking, turn the key on and listen for the fuel pump. It runs approx 30some seconds. Repeat the process once more, then crank. If it fires off, it'll verify the loss of prime.
     
    HillbillyDeluxeTruck, Nov 29, 2020
    HillbillyDeluxeTruck, Nov 29, 2020
    #5
  8. Nov 29, 2020 #6
    Jrry

    Jrry Bobtail Member

    18
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    Jun 4, 2016
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    Jrry, Nov 29, 2020
    Jrry, Nov 29, 2020
    #6
  9. Nov 29, 2020 #7
    shatteredsquare

    shatteredsquare Road Train Member

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    middle dirt
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    I saw on a video a bubba truck tech changing fuel filters say to bump the ignition, just once without letting it turn over, that it makes the fuel pump start running for 20 seconds or so as a way to prime before wasting cranks.

    is that
    1. true?
    2. not bad for engine timing/sync to bump ignition?
     
    shatteredsquare, Nov 29, 2020
    shatteredsquare, Nov 29, 2020
    #7
  10. Nov 30, 2020 #8
    Old Man

    Old Man Road Train Member

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    Oklahoma City, OK
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    What if you don’t have a electric fuel pump?
     
    Old Man, Nov 30, 2020
    Old Man, Nov 30, 2020
    #8
  11. Nov 30, 2020 #9
    Jrry

    Jrry Bobtail Member

    18
    2
    Jun 4, 2016
    0
    I want to appreciate to all for your comments. This morning I tried something different I turned the switch to on and nothing. So I decided to used the jumper cables from one truck to other the truck turn on on the first try. I’m thinking it’s something electrical. What you guys think?
     
    Jrry, Nov 30, 2020
    Jrry, Nov 30, 2020
    #9
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