3126B Loss of Power

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by volvodriver01, Oct 23, 2020.

  1. volvodriver01

    volvodriver01 Road Train Member

    I have a 3126B CAT in a FL50. After about 4 hours of running it is losing power/speed, will drop from 65mph gradually down to 25mph. Changed fuel filters, air filter and oil. Still happened so changed the fuel pressure regulator. Still happening. No fuel in the oil, no fuel in the coolant, no coolant in the oil and no oil in the coolant.

    What else can it be as to why is runs fine for 4 hours then has issues?
     
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  3. BoxCarKidd

    BoxCarKidd Road Train Member

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    I would want to know what ICP pressure is on that. Maybe the wrong term for a Cat but pressure after the second oil pump.
     
    spsauerland Thanks this.
  4. volvodriver01

    volvodriver01 Road Train Member

    Update**

    Unplugged ICP sensor and it ran about 10 miles at 70mph with no issues. Stopped and replaced ICP sensor. Within 15 miles the truck has reverted back to loss of power, loss of speed, feels like it is missing and starving for fuel. Starts great and idles as it should with no issues. Runs like crap under a load.
     
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