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Unknow missfire help!

Discussion in 'Performance' started by KingCrabb, Oct 15, 2017.

  1. KingCrabb

    KingCrabb New Member

    Truck is a DB51t Suzuki
    Iv had the truck for a little over a year now and has been running great.
    I finally decided to check the timing since everyone says you can advance a couple degrees to take advantage of our good fuel. Get it warmed up, throw the light on it and holy s***, 20-25 degrees! I turned it down to roughly 10. Took it for a ride and whoa. Trucks power band is totally different and much more linear. Actually spun the tire on asphalt in first. Never done that before. So now I'm happy, my truck runs ever better. And now here I am. About an hour later it's sitting there idling as I'm loading the bed with stuff and it starts to miss. After a while of tinkering I find that cylinder 3 is the miss. It's getting fuel, the spark plug is sparking, motor has 110psi compression on all 3 cold. Cam looks damn near brand new, has a little more lash that I would like but not bad. I have looked around the forum and the only thing semi helpful I found was one guy said something about if the distributor cap is bad it can kill a cylinder but still spark at the plug. I ordered and cap and rotor but won't be here till Friday.
    I may have left some things out but any help or advise will be appreciated and I'll let you know if I have tried it yet.
  2. fmartin_gila

    fmartin_gila Well-Known Member

    Have you physically pulled the spark plug & closely inspected for cracks or missing pieces of porcelain both on top & bottom of the metal part?

  3. KingCrabb

    KingCrabb New Member

    No missing porcelain but didn't look close enough for cracks. Going to get new plugs today after work anyway.

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