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Check Engine Light

Discussion in 'General Jeep Discussion' started by rapracing, May 2, 2017.

  1. May 2, 2017 at 4:59 PM
    #1
    rapracing

    rapracing [OP] Member

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    What would cause a check engine light to come on. Code is "misfire in cylinder 1".

    So far: New Coil Pack, New Plugs, New Oxygen Sensors, New PCV Valve

    Any ideas??
     
  2. May 2, 2017 at 5:56 PM
    #2
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine Moderator

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    Whats the actual code? What year is your jeep?
     
  3. May 2, 2017 at 8:13 PM
    #3
    K6puppy

    K6puppy Well-Known Member

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    You have a code p0301 cylinder 1 have you done a compression test if all the same how about your injector need year and model to help better
     
  4. May 3, 2017 at 6:03 AM
    #4
    rapracing

    rapracing [OP] Member

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    P0301
     
  5. May 3, 2017 at 6:04 AM
    #5
    rapracing

    rapracing [OP] Member

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    They did compression test and said all cylinders are with in spec, the lowest being 128. They switched injectors so I guess it could be in the wiring of them?

    '06 Wrangler
    4.0
     
  6. May 3, 2017 at 8:26 AM
    #6
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine Moderator

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    Given everything that's been done, I would check wires next
     
  7. May 3, 2017 at 9:38 PM
    #7
    K6puppy

    K6puppy Well-Known Member

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    do you have a noid light to check injecter pluse if you do check that first if not ohm out wiring
     
  8. May 3, 2017 at 9:45 PM
    #8
    K6puppy

    K6puppy Well-Known Member

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    To anyone who does not know a misfire code will be p0301 threw p0312 depending on cylinder depending on # of cylinders this is for every car or truck
     
    OFFGRID likes this.
  9. May 4, 2017 at 2:42 PM
    #9
    K6puppy

    K6puppy Well-Known Member

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    if you do not have a noid light take a 194 bolb pell meltal wiring so you have 2 metal prongs insert into injecter plug start jeep light should be bright and flashing also have you tryed a decarb to clean valves
     
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