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P0302 remains after attempted repair

Discussion in 'Wrangler JK (2007-2017)' started by meatman69, Apr 15, 2019.

  1. Apr 15, 2019 at 11:58 PM
    #1
    meatman69

    #1
    meatman69 [OP] New Member

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    hello this is randy last year I bought a 2014 jeep wrangler sport 2 door with a 3.6 engine ive done a lot of upgrades on it,but now it has a code P0302. I've replaced the coil boot and sparkplug still has a code. also I need to say it has less than 50,000 on it anyone have some help please.
     
    meatman69, Apr 15, 2019
    #1
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  2. Apr 16, 2019 at 3:40 AM
    #2
    Awrench

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    Awrench Well-Known Member

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    thats a common code P0302 a misfire could be either ignition, fuel, mechanical.

    1st - counter intuitive #2 cylinder is driver side front plug. Were you on correct cylinder?
    Were there any other codes - did you use a scanner?
    You changed just the 1 spark plug? same BRAND and #?
    This is a COP (coil over plug) did you check spark at plug?
    Add a can of 'seafoam' or 'techron' fuel treatment - will clean a gummed up injector.

    After confirming with a scanner, doublechecking #2 spark, next a compression test.

    PS: lots of 'upgrades' no powertrain (engine) mods- none?
     
    Awrench, Apr 16, 2019
    #2
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  3. Apr 16, 2019 at 5:12 AM
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    TJ_abuser

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    TJ_abuser Well-Known Member

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    Welcome from Texas there are some smart people on here someone will steer you in the right direction at least.
     
    TJ_abuser, Apr 16, 2019
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  4. Apr 16, 2019 at 5:32 AM
    #4
    Prerunner1982

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    Prerunner1982 Well-Known Member

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    Hello Randy, welcome from Oklahoma.
     
    Prerunner1982, Apr 16, 2019
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  5. Apr 16, 2019 at 5:34 AM
    #5
    Prerunner1982

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    Prerunner1982 Well-Known Member

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    Pun intended? :rofl:
     
    Prerunner1982, Apr 16, 2019
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  6. Apr 16, 2019 at 5:37 AM
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    aggrex

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    aggrex Well-Known Member

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    Tuffy>AEV>TTO>JW>STech>EVOcage>MagnaFlow>SpiderTrax>RockHard>TF>SpringTail>67design>Bolt>GPCA>Curt>
    aggrex, Apr 16, 2019
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  7. Apr 16, 2019 at 9:02 AM
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    meatman69

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    meatman69 [OP] New Member

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    meatman69, Apr 16, 2019
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  8. Apr 16, 2019 at 9:04 AM
    #8
    meatman69

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    meatman69 [OP] New Member

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    good input I was thanking 2 cylinder was passenger front lol
     
    meatman69, Apr 16, 2019
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  9. Apr 16, 2019 at 9:26 AM
    #9
    Harleymick

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    Harleymick Well-Known Member

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    If all else fails, pull the CPS and clean the plug in thoroughly with spray electronics cleaner. The last time my engine started sputtering and I received a code I unplugged all of the sensors, cleaned them and plugged them back together. I don't know which one fixed it but it doesn't really matter. I worked part time at O'Reilly's Auto Parts and sold a lot of new sensors when the old one simply needed cleaned.
     
    Harleymick, Apr 16, 2019
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  10. Apr 16, 2019 at 12:15 PM
    #10
    Awrench

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    Awrench Well-Known Member

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    for future reference

    3.6 firing.jpg
     
    Awrench, Apr 16, 2019
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