Power boost lost while under a load

Discussion in 'Kenworth Forum' started by mayzend, Jul 25, 2012.

  1. mayzend

    mayzend Bobtail Member

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    Jul 25, 2012
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    I have a 2002 Kenworth W900 with a Cat3406e. When I take off with a load on, it takes a little while to do this, but it will lose all power to the turbo, when I turn the key off and back on it will kick the turbo back in. This problem has started occuring a lot lately. (It will kick out, I turn key off and back on, turbo kicks back in) it does this around 10 times in an hour, sometimes it doesnt do it at all. Does anyone know what the problem might be?
     
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  3. bender

    bender Road Train Member

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    Could be the boost sensor running out of range and cycling of the key resets it, but just a guess. Best to check it with Cat ET and find out for sure.
     
  4. mayzend

    mayzend Bobtail Member

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    Jul 25, 2012
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    Bender, I have changed the boost sensor and the throttle sensor, neither one of them helped the problem. Do you have any other suggestions on what it could possibly be? Thanks
     
  5. bender

    bender Road Train Member

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    Intake air temp sensor, a bad injector. Have you had it checked for codes etc? You can spend a bunch on parts and get nowhere by guessing.
     
  6. mayzend

    mayzend Bobtail Member

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    I'm going to put it on a computer this weekend. It isn't throwing any codes out or setting any alarms off when this happens, it has me stumped. I am getting less mpg also, my tanks doesn't empty all the way either. My truck will run warm enough that the buzzer will go off before it starts cooling down, do you think this has anything to do with the power loss?
     
  7. mayzend

    mayzend Bobtail Member

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    Jul 25, 2012
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    I'm going to put it on a computer this weekend. It isn't throwing any codes out or setting any alarms off when this happens, it has me stumped. I am getting less mpg also, my tanks doesn't empty all the way either. My truck will run warm enough that the buzzer will go off before it starts cooling down, do you think this has anything to do with the power loss?
     
  8. bender

    bender Road Train Member

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    If your tanks aren't drawing down to the bottom I would be checking the tanks for debris interfering with the stand pipe and I would replace the fuel suction lines. The fuel lines can develop a blockage (fissure) where the inner rubber liner gets loose and creates a check valve. The suction on the fuel line pulls the liner into the fuel path blocking fuel flow. Shut the truck off and stop fuel pump suction and the liner goes back in its place until you get into a hard pull, then it repeats itself.

    Overheating from a power loss in this kind of weather is very understandable, the engine and cooling system are being worked extra hard and beyond their capacities.
     
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  9. mayzend

    mayzend Bobtail Member

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    I am getting in the shop this weekend, I am in chicago right now and have to go to Arkansas. Hopefully I can make it in, I have to turn key off and back on when I loose power and it will kick it right back in and run right for just a bit. Sometimes I have to do this ten or more times before it stops loosing power for awhile. Very Strange... I just hope I am not tearing something else up by doing this and I can get it home and to the shop.
     
  10. bender

    bender Road Train Member

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    It really sounds like an electronic issue. If it hasn't in fact set any codes pertaining to this issue then monitoring live data should give the technician the necessary clues. If you get a chance and if you're familiar you might check ECM power supply and grounds etc. Sometimes moisture intrusion into an electronic plug connection can do weird things as well. Have you had any coolant leaks or washed your engine recently? I've also heard of a checkvalve in the ECM cooler that can fail although I've never seen this first hand, I thought I would mention it as a possibility. Good Luck!
     
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  11. PROSTREET80

    PROSTREET80 Light Load Member

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    Jul 11, 2012
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    Are you sure it isn't just starving out for fuel and pulling the boost down. That turbo on that engine is all manual so it sounds like its losing fuel presure and running out of wind that woud make the turbo than drop out with no fuel much in the combustion chambers to blow the impeller in the turbo. Those engines were not as advanced as the ones now a it wouldn't nessaceraly throw a code for low fuel preasure. The only way to check it is first just change both of the filters and see if it stops. If it don't then you will have to have a fuel presure gauge that you can snap on the fuel fitting at the filter base and run it up through the side glass and whatch it in the cab while your pulling a load. If it looses fuel presure when it does this than it is a fuel delevery issue and it could be possibly a bad strataflex fuel line like Bender was talking about. Good luck with everything. The fuel presure on that engine should be 90 to 100psi if its dropping down to 60 or less than thats the problelm.
     
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