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Misfire on cold start with 2011 Wrangler

Discussion in 'Wrangler JK (2007-2017)' started by Va green beast, Jul 17, 2018.

  1. Jul 17, 2018 at 2:11 AM
    #1
    Va green beast

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    Va green beast [OP] Member

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    Sprintex supercharger
    So this just started. I have a 2011 wrangler unlimited jk with a sprintex supercharger system. When i start it up it will misfire and rough idle cold, but once its warmed up she runs like a champ. Iv cleaned everything out and changed the plugs, lines, and ignition coil to all upgraded but still does it. Im thinking it might be my egr valve but not sure has anyone else had this problem or any idea what it might be. Its never died on me but it will definitely miss when its first warming up.
     
    Va green beast, Jul 17, 2018
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  2. Jul 17, 2018 at 3:05 AM
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    Billy1234

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    Billy1234 Well-Known Member

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    I’m actually going threw sorta the same thing with my 2011 jku. Not when I start it but after it sits for a few minutes running it will misfire. The one thing I was told it could be is fuel injectors could be dirty. I just haven’t gotten around to check them out yet. I’d try that.
     
    Billy1234, Jul 17, 2018
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  3. Jul 17, 2018 at 3:05 AM
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    Billy1234

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    Billy1234 Well-Known Member

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    By the way welcome to the forum!
     
    Billy1234, Jul 17, 2018
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  4. Jul 17, 2018 at 3:08 AM
    #4
    Va green beast

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    Va green beast [OP] Member

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    Sprintex supercharger
    Thanks for the welcome yeah i thought that but iv cleaned my injectors and they are after market and i only run high octane. I went ahead and rulled them out since they are a pain to do with a supercharger.
     
    Va green beast, Jul 17, 2018
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  5. Jul 17, 2018 at 3:10 AM
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    Billy1234

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    Billy1234 Well-Known Member

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    Good point I don’t have a supercharger.... yet lol I’d try the egr valve then.
     
    Billy1234, Jul 17, 2018
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  6. Jul 17, 2018 at 3:11 AM
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    Va green beast

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    Va green beast [OP] Member

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    Sprintex supercharger
    Yeah im going to replace it. Its such a pain with it being right next to the fire wall tho no room at all
     
    Va green beast, Jul 17, 2018
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  7. Jul 17, 2018 at 3:12 AM
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    Billy1234

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    Billy1234 Well-Known Member

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    Let me know if it works cause if I do the injectors this weekend. And it don’t work I’m ganna have to keep searching to why it’s happening.
     
    Billy1234, Jul 17, 2018
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  8. Jul 17, 2018 at 3:13 AM
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    Va green beast

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    Va green beast [OP] Member

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    Sprintex supercharger
    Ill keep you updated on what iv done and what works
     
    Va green beast, Jul 17, 2018
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  9. Jul 17, 2018 at 7:37 AM
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    chris4x4

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    chris4x4 With sufficient thrust, pigs fly just fine Moderator

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    Welcome aboard!
     
    chris4x4, Jul 17, 2018
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  10. Jul 17, 2018 at 8:12 AM
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    aggrex

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    aggrex Well-Known Member

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    Welcome! A supercharged JK sounds awesome but not when it's misfiring so I hope you figure it out soon.
     
    aggrex, Jul 17, 2018
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  11. Jul 17, 2018 at 8:25 AM
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    Va green beast

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    Va green beast [OP] Member

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    Sprintex supercharger
    Yeah she runs like a beast with 37s lift and all the armor shell still move im pretty sure its the egr valve leta hope
     
    Va green beast, Jul 17, 2018
    #11
  12. Jul 17, 2018 at 9:31 AM
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    Awrench

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    Awrench Well-Known Member

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    supercharged -
    with your scanner look at codes codes then look at- Fuel trim, o2 sensor voltages,
    might want to check fuel pressure and then KOEO observe fuel pressure drop - drops Xpsi in 5minutes?
     
    Awrench, Jul 17, 2018
    #12
  13. Nov 14, 2019 at 7:55 PM
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    Jrgabriel

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    Jrgabriel Well-Known Member

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    I have a 2011 Jeep Grand Cherokee 5.7L 2wd.

    My issues are a little different but maybe similar. Mine seems to be riding rough in that 60-75 range and above. I’ve had spark plugs changed...

    had tires looked at (which I didn’t think it was this either) and tire shop said the tires are good and they thought it was drive shaft and coming from rear of car. I don’t think that’s it.

    here is a little history - https://www.jeeps.net/threads/issues-for-5-months.4257/#post-34083
     
    Jrgabriel, Nov 14, 2019
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