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5.9 L runs rich and backfires

Discussion in 'Engine & Performance' started by Doug Larson, Nov 7, 2019.

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  1. Doug Larson

    Doug Larson Junior Member

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    Joined:
    Jun 9, 2018
    Location:
    Mankato, MN
    Ram Year:
    2002 (2nd Gen)
    Engine:
    5.9L 360ci Gas
    02 Ram 2500 5.9 L Magnum. Just replaced heads, cap, rotor, plugs fuel pump, fuel filter and both O2 sensors. The truck runs rough with half the power. Its also running rich and backfires. All the electric checks out. Plug wires are correct and theres plenty of spark. Is it running bad because the computer is used to it and needs a hard start?
     
  2. Yeret

    Yeret The Village Drunk

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    Joined:
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    Location:
    Under the hood fixing/breaking something.
    Ram Year:
    1999
    Engine:
    5.9 Magnum
    Was the engine running rough prior to the work you did?
     
  3. crazykid1994

    crazykid1994 Senior Member

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    Ram Year:
    2017
    Engine:
    Hemi 5.7
    Could be fuel sync off or o2 sensors. What brand o2 sensor did you install? These trucks are picky. Made sure the plug wires are 100% at the proper cylinder?
     
  4. Yeret

    Yeret The Village Drunk

    Age:
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    Location:
    Under the hood fixing/breaking something.
    Ram Year:
    1999
    Engine:
    5.9 Magnum
    Yeah, I've read mixed results with Bosch O2 sensors. Cheap "no name" seem to be straight "no go." The NTK's seem to reliably review pretty well. That's what I'm running and no problems after about three years.
     

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