3406E Sputtering Only Under Acceleration

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Jordonh, May 8, 2025.

  1. Jordonh

    Jordonh Bobtail Member

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    Jul 1, 2022
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    Hey Ya’ll

    So I have a 3406E Cat in a FLD120.

    Recently got my engine rebuilt 2 months ago and it has started sputtering and smoking upon acceleration in the lower gears, if u park it and rev it to a certain rpm it will just stutter then go back to normal operation. It’s like a here and there type of thing it’ll act up then u can drive it for 2hrs without no issue.

    Already replaced fuel filters/ check valves-cam sensor so far. Sounds like it’s either sucking air somewhere or it’s a wiring/injector issue.

    https://youtube.com/shorts/0juHP_zhHJc?si=ls9V7AylFzHiGFeK
     
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  3. Iamoverit

    Iamoverit Road Train Member

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    I'd take it back to wherever rebuilt it. Could be as simple as an injector harness. Nobody can diagnose your issue from behind a keyboard.
     
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  4. Star Rider

    Star Rider Road Train Member

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    I'll bet the cam gear is 1 tooth off.
     
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  5. little cat 500

    little cat 500 Road Train Member

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    more than likely junk injector
     
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