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Thread: 3406c Lacks Power

  1. #1
    Junior Member
    Join Date
    Jun 2018
    Location
    Madison, ga
    Posts
    1

    3406c Lacks Power

    ve got a 3406c that lacks power. I've been through all the basics. Its getting plenty of fuel to the injection pump. Boost is around 25lbs full throttle. I backed the fuel and torque screws out and they made just a little difference the first 3 turns then that's all the fuel it seems to give. I eliminated the afrc and installed the cover. Low rpm range is good(moderate smoke) but it falls off about mid range on up (almost no smoke). The pump is a 7E-5888
    Any suggestions are greatly appreciated!

    SN: 8PN12421
    Eng model: 3406
    Performance spec: 2t-9420
    Rated: 425hp@1900
    Fuel timing 7.0BTC

  2. #2
    Senior Member Truck Shop's Avatar
    Join Date
    Dec 2015
    Location
    washington, st.
    Posts
    885
    When was the last time that the injector pump has seen any major work or the advance? If it's the one I'm thinking of as a C model there is a plastic arm on the advance that breaks
    and it will cause very sluggish response zero power.

    Truck Shop

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