Random Cylinder misfire

FLgator Dec 3, 2018

  1. FLgator

    FLgator Test Drive

    Messages:
    19
    Location:
    NE Houston
    hello once again all,

    Have a code that came up, P0300, or a Random/ multiple misfire in multiple cylinders. New NGK iridium spark plugs were put in, along with NGK spark plug wires a couple weeks ago for a tune up. Anyone have any other clues?

    Thanks.
     
  2. Bushnut

    Bushnut Bought an X

    Messages:
    72
    Location:
    winnipeg
    Check the rotor and cap.... while checking the rotor look inside the distributor for any red dust or excessive play of the shaft. The distributor is known to go bad.
     
  3. FLgator

    FLgator Test Drive

    Messages:
    19
    Location:
    NE Houston
    Would the distributor cause a severe vibration that runs throughout the vehicle during idle?
     
  4. Bushnut

    Bushnut Bought an X

    Messages:
    72
    Location:
    winnipeg
    No. That is the miss fire. Unbalanceing the engine. When all 6 cylinders fire in the proper order it purrs like a kitten, when one or more don’t fire that causes the uneven vibration.
    By checking the rotor and cap look for excessively burned contacts. Or a build up of carbon on them. If that is what you find, replace them This is the cheap fix.
    If everything looks ok. I might start looking at the fuel delivery system. Excessive or not enough fuel can also lead to misfires.
    I had this problem with an R50 pathfinder. It had a leaking injector that flooded one cylinder causing it not to fire. Once I replaced that injector it worked fine. If this is the problem just hope it is on the passenger side as it is easiest to get to. Driver side requires the removal of the intake plenum to access the injectors.
    Good luck, you can fix this.
     

Share This Page