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C15 boost problems. PLEASE HELP!!!

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Forddude86, May 20, 2014.

  1. May 20, 2014 #1
    Forddude86

    Forddude86 Bobtail Member

    2
    1
    May 20, 2014
    0
    Im a first time poster so hello everyone. Ok, I drive a 2005 Peterbilt 379 with a twin turbo C15 Acert motor. It has inconsistent boost. When I first start it, it'll boost around 40 as it should but sometimes it bounces around and wont keep solid boost. Then about 20-30 min of driving and it drops down to barely 30. It has horrid power the rest of the day. I've checked all pipeing and found no leaks or damage. What could cause this problem?
     
    Forddude86, May 20, 2014
    Forddude86, May 20, 2014
    #1
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  3. May 20, 2014 #2
    maggard359

    maggard359 Medium Load Member

    476
    412
    Nov 20, 2013
    Florida
    0
    I would check wastegate and boost sensor. Boost sensor can go bad and not give a check engine light.
     
    maggard359, May 20, 2014
    maggard359, May 20, 2014
    #2
    Forddude86 Thanks this.
  4. May 20, 2014 #3
    morehp

    morehp Medium Load Member

    699
    206
    Jun 18, 2012
    0
    You need to pressurize the intake system and sprey all boost hoses, the cac and bellows with soapy water, it could be a crack in something opening up when it gets warm. Also double check the exhaust manifold for any signs of cracks or leaks around the sealing surphaces, hard to see behind the turbos sometimes. How long since the overhead has been set ?? Get that done if its been a whyle. Waste gate on high press turbo could be seizing open like the other poster said also.
     
    Last edited: May 20, 2014
    morehp, May 20, 2014
    morehp, May 20, 2014
    #3
    Forddude86 Thanks this.
  5. May 20, 2014 #4
    04 LowMax

    04 LowMax Medium Load Member

    440
    248
    Feb 3, 2013
    Alberta
    0
    There was somebody else with this problem not very long ago on a twin turbo, with lots of replies. Try doing a forum search, there was quite a bit of feedback as I recall.
     
    04 LowMax, May 20, 2014
    04 LowMax, May 20, 2014
    #4
    Forddude86 Thanks this.
  7. May 30, 2014 #5
    Forddude86

    Forddude86 Bobtail Member

    2
    1
    May 20, 2014
    0
    Found the problem. It dropped an injector the other day, got it replaced and now it runs great. It must had a "factory reject" put in it during the overhaul. Now it runs 40-45 psi consistantly. Its like driving an entirely different truck now! Thank you all for your help!
     
    Forddude86, May 30, 2014
    Forddude86, May 30, 2014
    #5
    rollin coal Thanks this.
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