Bad mpg low power

Discussion in 'Experienced Truckers' Advice' started by Meaux, Sep 16, 2020.

  1. Meaux

    Meaux Bobtail Member

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    Sep 16, 2020
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    I just purchased a 07 western star 4900 with 14.0 lit 60 series. Changed all filters and tune truck up to 600 hp. Mpg at 4.9 with low power. No black smile no white smoke out exhaust. Change boast sensor still the same. Tightend all air leaks. Turbo psi highest reading is 32 psi and that only briefly. Can anyone tell me the next place I need to find my mileage and power. Truck only has 120k miles been sitting up in the oil fields
     
    truckdriver31 Thanks this.
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  3. Ridgeline

    Ridgeline Road Train Member

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    Did you dyno the truck and had the ECM dumped?
     
  4. truckdriver31

    truckdriver31 Road Train Member

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    120k miles with a 1,000,000 hours tho. i would check everything out. air to air. turbo, waste gates, vpod, etc
     
  5. Cattleman84

    Cattleman84 Road Train Member

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    I just recently had a truck start acting similar... Had to have the cam and exhaust rockers replaced.
     
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  6. truckdriver31

    truckdriver31 Road Train Member

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    i would do a cylinder cut out test.
     
  7. Meaux

    Meaux Bobtail Member

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    Sep 16, 2020
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    WhAt kinda engine?
     
  8. Cattleman84

    Cattleman84 Road Train Member

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    D13
     
  9. Meaux

    Meaux Bobtail Member

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    Sep 16, 2020
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    No.
     
  10. AModelCat

    AModelCat Road Train Member

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    Fuel mileage is all relative. 4.9 is considered excellent in some applications.
     
    650cat425, magoo68 and Roberts450 Thank this.
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