Cat3406e runs fine empty but when loaded miss fire

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by cderuyter24, Mar 16, 2023.

  1. cderuyter24

    cderuyter24 Bobtail Member

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    Mar 16, 2023
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    So the company I work for just rebuilt a truck it’s got stage 1 injectors,cam,turbo and a fass fuel system. All new fuel lines. On a hard pull loaded it runs good for a couple seconds until it builds boost which wraps the 45lb boost gauge then starts shuttering and sounds like it’s running dry then if I get out of it and back in to it it still does it. The tune in it is the 550 hot tune. Any help would be apreciated.
     
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  3. bjytech

    bjytech Light Load Member

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    Need to verify fuel pressure doesn't drop when under load. really sounds like it is starving, not having the correct fuel filters on the engine can cause the fuel pressure to drop as well.
     
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  4. SomeCanadian

    SomeCanadian Bobtail Member

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    Nov 11, 2021
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    I’m not a mechanic.
    I know some cats will take 46#+. You said you’re maxing out a 45# gage. Is it up against a pin at the end or does it wrap around? If’s without a pin and your guesstimate is ~50# or more, you may want to verify your blowoff/pressure release isn’t stuck.
     
    cderuyter24 and Oxbow Thank this.
  5. Oxbow

    Oxbow Road Train Member

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    Nov 24, 2015
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    delete
     
  6. cderuyter24

    cderuyter24 Bobtail Member

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    Mar 16, 2023
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    I forgot to add its non wastegated I let off to shift getting on 80 in pa loaded on Friday and it sneezed and blew a intercooler boot lucky I was only couple miles from a shop and got one but yeah none waste gated
     
  7. cderuyter24

    cderuyter24 Bobtail Member

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    Mar 16, 2023
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    Okay yeah it’s still got the filter on the primer and now the two on the 165 fass think it’s that I’ll check in morning u would not think it be starving with that after market lift pump but who knows they thought maybe a boost sensor
     
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