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3406E power problem

Discussion in 'Trucks [ Eighteen Wheelers ]' started by logtrucker25, Apr 27, 2011.

Page 1 of 4
  1. Apr 27, 2011 #1
    logtrucker25

    logtrucker25 Light Load Member

    70
    9
    Jul 27, 2009
    northern CA
    0
    Hey all still trying to figure out why I have low boost on a 5ek factory 475. I've had the turbo checked, put new cac boots on, tried pinching the wastegate, changed the boost sensor and changed the fuel filters. It will only get 18 lbs of boost in a pull and is very sluggish but the weird thing is if you come to a stop after driving for a while an take off again it will get its normal 25 pounds of boost but only for 30 seconds or so. Seems like maybe not enough fuel? it runs perfectly smooth an never smokes any color anytime an throws no codes. Any help would be appreciated, thanks
     
    logtrucker25, Apr 27, 2011
    logtrucker25, Apr 27, 2011
    #1
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  3. Apr 27, 2011 #2
    little cat 500

    little cat 500 Road Train Member

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    Abbottstown PA
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    maybe the waste gate is set to light opening up to fast or bad gauge maybe
     
    little cat 500, Apr 27, 2011
    little cat 500, Apr 27, 2011
    #2
  4. Apr 27, 2011 #3
    king Q

    king Q Road Train Member

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    Johannesburg sa
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    Can be a crack in the inter-cooler.
    Only opens up when it heats up due to absorbing heat from the hot compressed air.
    Once flow stops the crack seals up again till it heats up again giving you the 30 seconds with out boost leakage.
     
    king Q, Apr 27, 2011
    king Q, Apr 27, 2011
    #3
    logtrucker25 Thanks this.
  5. Apr 27, 2011 #4
    dicky

    dicky Bobtail Member

    31
    8
    Aug 16, 2008
    st.paul , mn.
    0
    Do you have a fuel pressure gauge in the final filter housing ? , if not put a gauge on to monitor it while you are running it , see what changes when you have boost and when you don't have boost . You said it's a 5EK so I'm guessing its in an older tractor. I would be leaning towards swollen fuel lines as being your problem.
     
    dicky, Apr 27, 2011
    dicky, Apr 27, 2011
    #4
    logtrucker25 Thanks this.
  7. Apr 28, 2011 #5
    logtrucker25

    logtrucker25 Light Load Member

    70
    9
    Jul 27, 2009
    northern CA
    0
    Thanks for the help so far I'll have to pressure check the CAC. today i drove with a fuel pressure guage hooked up an it stayed at 60 the whole time no matter what boost. (50 at idle) is that kinda low??? I"ve replaced all the fuel lines except the small one that goes from one side of motor to other
     
    logtrucker25, Apr 28, 2011
    logtrucker25, Apr 28, 2011
    #5
    Swamp molly Thanks this.
  8. Apr 28, 2011 #6
    Heavyd

    Heavyd Road Train Member

    7,812
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    Feb 4, 2009
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    Is your CAC plugged by any chance? Check for dirt or lots of bugs. I may just need a good cleaning.
     
    Heavyd, Apr 28, 2011
    Heavyd, Apr 28, 2011
    #6
  9. Apr 28, 2011 #7
    little cat 500

    little cat 500 Road Train Member

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    Jan 17, 2010
    Abbottstown PA
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    fuel pressure is kinda low for a 3406e
     
    little cat 500, Apr 28, 2011
    little cat 500, Apr 28, 2011
    #7
  10. Apr 28, 2011 #8
    little cat 500

    little cat 500 Road Train Member

    2,055
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    Jan 17, 2010
    Abbottstown PA
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    mine runs around 80 at idle and 110 down the road if that help's
     
    little cat 500, Apr 28, 2011
    little cat 500, Apr 28, 2011
    #8
    logtrucker25 Thanks this.
  11. Apr 28, 2011 #9
    Superhauler

    Superhauler TEACHER OF MEN

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    keep stroking.
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    emodel cat doesnt have an intercooler just a cac.
     
    Superhauler, Apr 28, 2011
    Superhauler, Apr 28, 2011
    #9
  12. Apr 28, 2011 #10
    Krooser

    Krooser Road Train Member

    2,493
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    Jul 25, 2010
    Wisconsin
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    Charge air cooler and air to air intercooler are interchangeable terms I believe...Mack was one of the first to use an air to air... that's what they call 'em around here to this day...
     
    Krooser, Apr 28, 2011
    Krooser, Apr 28, 2011
    #10
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