I have a 2006 Chevy 1500 with 4.8 5 speed and I get a random misfire code in #8 cylinder.

jac1962jac1962 Member Posts: 1
edited May 2015 in Chevrolet
I have a 2006 chevy 1500 with 4.8 5 speed and I get a random miss fire code in #8 cylinder doesn't do this all the time just sometimes I have changed wires plugs coil and injectors around and still get miss fire in cyilinder #8 could this be the computer only throws code when driving and engine light does not stay on only blinks when missing. on this server.


  • Mr_ShiftrightMr_Shiftright Sonoma, CaliforniaMember Posts: 64,482

    I think you should run a compression test on #8 and start from there.

    Other possibilities

    Vacuum leak(s)
    Low or weak fuel pressure (including plugged fuel filter)
    Improperly functioning EGR system
    Defective Mass Air Flow Sensor
    Defective Crankshaft and/or Camshaft Sensor
    Defective Throttle Position Sensor
    Mechanical engine problems (i.e.—low compression, leaking head gasket(s), or valve problems

    If this misfire only occurs at high speed, you also have to look at the less likely possibility of a powertrain misfire, especially if you experience any kind of violent jerking while decelerating.
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