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308qv cylinder miss fire

Discussion in 'Technical Q&A' started by fer308qv, Aug 15, 2014.

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  1. fer308qv

    fer308qv Karting

    Jul 12, 2006
    79
    Patchogue
    Full Name:
    Matt Kellers
    #1 fer308qv, Aug 15, 2014
    out driving yesterday, and seemingly developed a miss in one cylinder. started as intermittent and became more steady. if I feather the gas, I do hear a pop.
    Major service completed recently. I did had a miss prior, but not after the service.
    Any "do it yourself tips" for diagnosing? plugs new wires caps original 44k
    thanks
    Matt
    I did drop about 20 gals fuel 93 octane prior to drive......
     
  2. Mantinger

    Mantinger Karting

    Jul 30, 2004
    145
    Netherlands, Drenthe
    Full Name:
    H
    #2 Mantinger, Aug 21, 2014
    No reply? Is the problem solved already?
    Well, lets try some of this:

    Are the sparkplug extenders new? Good contact?
    Did all the extenders slide on the spark plugs?
    The high voltage wires. Free from any damage? Look closely.
    Check your sparkplugs for damage, bent elektrodes caused during installation?
    Check the wire connections into the rotor caps: tight?
    Rotor inner contacts clean? Rotor clean? Give them a polish.
    Carbon tips inside the caps: free movement?

    Second possibility:
    Check fuel injectors. Are they working correctly? (Spray pattern).
     
  3. fer308qv

    fer308qv Karting

    Jul 12, 2006
    79
    Patchogue
    Full Name:
    Matt Kellers
    #3 fer308qv, Sep 28, 2014
    Sorry for the delay..........health issues
    Problem solved........small bolt securing rear bank injector lines to air box was not tighten properly after major service. Bolt came out completely causing massive vacuum leak.
     

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