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CAT C-12

Discussion in 'Trucks [ Eighteen Wheelers ]' started by M YANCEY, Sep 21, 2009.

  1. Sep 21, 2009 #1
    M YANCEY

    M YANCEY Bobtail Member

    4
    0
    Sep 21, 2009
    goldsboro nc
    0
    Guys I am new to your forum, But I have a problem with a 2001 freightliner with C-12 and it was a code31 which is 31 84-01 Vehicle Speed loss of signal and the truck is sitting steal.
    1 replaced cam sensor
    2 replaced crank sensor
    3 replaced ecm
    and when it sets this code the engine is blowing white smoke out the exhaust. Has anybody had this problem please help thanks....
     
    M YANCEY, Sep 21, 2009
    M YANCEY, Sep 21, 2009
    #1
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  3. Sep 22, 2009 #2
    M YANCEY

    M YANCEY Bobtail Member

    4
    0
    Sep 21, 2009
    goldsboro nc
    0
    Guys just thought I would let you know I found the problem..
    It was the fuel pressure regulator stuck closed would not let fuel return back to the tank and caused fuel pressure to get to high and set the code,Strang problem!!
     
    M YANCEY, Sep 22, 2009
    M YANCEY, Sep 22, 2009
    #2
  4. Sep 22, 2009 #3
    Bent Wrench

    Bent Wrench Medium Load Member

    588
    205
    Aug 11, 2009
    Cornholio, OR
    0
    What does vehicle speed signal loss have to do with fuel pressure?

    Maybe yer reading the wrong bible to ID codes....?
     
    Bent Wrench, Sep 22, 2009
    Bent Wrench, Sep 22, 2009
    #3
  5. Sep 22, 2009 #4
    M YANCEY

    M YANCEY Bobtail Member

    4
    0
    Sep 21, 2009
    goldsboro nc
    0
    This is why If you read the code logics the reason for it to set the code was
    #1 speed is 0 mph
    #2 engine over 650rpm's
    #3 rack fuel vol over 7.0mm and that is the part that set the code, bacause fuel pressure regulator stuck close and ramp the fuel pressure over 120psi that is when the high fuel pressure and NO return fuel the engine was starving for fuel, pluse width was getting wider and wider, The rack fuel vol was over 8.9mm and SET THE CODE...
     
    M YANCEY, Sep 22, 2009
    M YANCEY, Sep 22, 2009
    #4
  7. Sep 22, 2009 #5
    truckin cowboy

    truckin cowboy Bobtail Member

    45
    6
    Dec 23, 2007
    Oklahoma
    0
    the best thing to do with a c-12 cat is run it off a cliff and tell the insurance man it was stolen then go buy you a real truck with a real motor in it.
     
    truckin cowboy, Sep 22, 2009
    truckin cowboy, Sep 22, 2009
    #5
    CaterpillarWrench Thanks this.
  8. Sep 23, 2009 #6
    M YANCEY

    M YANCEY Bobtail Member

    4
    0
    Sep 21, 2009
    goldsboro nc
    0
    I agree 100% !!!!

    That is what I would do if it was mine!!!!
     
    M YANCEY, Sep 23, 2009
    M YANCEY, Sep 23, 2009
    #6
  9. Sep 26, 2009 #7
    farmermatt

    farmermatt Light Load Member

    95
    30
    Aug 7, 2009
    Lowry City, MO
    0
    Oh bull dont knock it if you dont own it I run one and love it its a lightweight fuel efficient powerhouse saving 800 lbs for me means more money in my pocket every load I think its an excellent motor

    like "real motors" never have problems

    if they were junk how come so many bulk haulers (tanker, hopper, pneumatic tank) etc run them? excellent motor in the right application

    can your real motor get 7.35 mpg in a pete 379 ? I doubt it

    mine aint goin off a cliff anytime soon
     
    farmermatt, Sep 26, 2009
    farmermatt, Sep 26, 2009
    #7
  10. Sep 26, 2009 #8
    Mack427

    Mack427 Medium Load Member

    323
    93
    Jan 22, 2009
    0
    Motor works great on combines and cat farm tractors, not exactly cream puff conditions don't know why some people have issues on road no dust not under full load 100% of the time
     
    Mack427, Sep 26, 2009
    Mack427, Sep 26, 2009
    #8
  11. Sep 26, 2009 #9
    polrmk

    polrmk Bobtail Member

    17
    3
    Apr 2, 2009
    hartland, mn
    0
    I would have to agree with farmermatt on this. Lightweight and fuel-efficient with decent power sums it up.
     
    polrmk, Sep 26, 2009
    polrmk, Sep 26, 2009
    #9
    farmermatt Thanks this.
  12. Oct 5, 2009 #10
    truckin cowboy

    truckin cowboy Bobtail Member

    45
    6
    Dec 23, 2007
    Oklahoma
    0
    no wonder they work so good in bulk hauler trucks hell they spend half there time running empty hell my big motor can get 7.5 running empty
     
    truckin cowboy, Oct 5, 2009
    truckin cowboy, Oct 5, 2009
    #10
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