Loss of power 2013 paccar mx13

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Btmnkarr, Dec 8, 2021.

  1. Btmnkarr

    Btmnkarr Bobtail Member

    Dec 8, 2021
    I am experiencing loss of power in the hills and take off it feels like a fuel problem. I have changed fuel filters several times and checked all the fuel lines. I blew air thru them and all was fine. The only thing I noticed is the return line is dry - does it need to have a constant flow of fuel thru the return line ? If so I am assuming the blockage would be inside the water separator cause I checked the lines on both sides and it seems to be good.
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  3. Goodysnap

    Goodysnap Road Train Member

    Jul 12, 2017
    Good evening new member,

    This is where I would begin-

    For the air management faults or low power complaints with high idle time, it is recommended to perform the following checks:
    1. Check the intake and exhaust system for signs of leaks.
    2. Inspect the EGR cooler outlet for the presence of Vitreous Carbon deposits. (Hard shiny deposits). If the deposits are present EGR cooler replacement may be required. If the cooler is filled with soot only (soft powdery carbon deposits,) flush the EGR cooler per the E051 bulletin. Look for signs of coolant loss. Make sure to check the venturi for any corrosion or scaling. It is important that the venturi is cleaned as well.
    3. Check the reading in DAVIE, and inspect the following sensors for any soot at the sensor tips or in their ports/pressure tubes. The reading in DAVIE with the key on, engine off should be between 0-1 psi with the exception of the EGR Delta-P Sensor (F751) which will read 0.0-0.1 psi. The air management temperature sensors should be within 15 degrees of each other. Clean/replace as necessary.
    • Boost Pressure (F802)
    • Before Turbine Pressure (F826)
    • After BPV Pressure (F823)
    • EGR Differential Pressure (F751)
    • EGR temperature sensor (F749)
    • Air intake temperature sensor (F804)
    • Check the EGR valve, physically check the EGR valve to ensure the pin is securing the flap to the shaft and that the valve is not sticking and can move freely.

    Boost sensors are common to plug over solid with carbon. Once blocked the engine ECM/PCI cannot see boost or thinks its low and will not add fuel.

    A good clean up and EGR flush of all the sensors above is good preventative on the engine.
    OutlawW900 Thanks this.
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