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Thread: Misfire under low load

  1. #1
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    Misfire under low load

    Hi guys as above my s14 has developed what sounds like a misfire under low throttle input. As in cruising at 70 kind of throttle. It hesitates and sounds like it's misfiring. If I squeeze the throttle just a tad more it instantly goes the way it should. Boost increases normally and she boosts nice and hard when floored. I have stage 1a mods on a standard map running just under 1bar. Any ideas? I'm guessing coil packs or sparkys!


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  2. #2
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    Bump! Anyone? Some googling has suggested maybe Idle control valve or leaky BOV. I will delete the BOV and clean the idle control valve this weekend and see if it helps but any suggestions in the mean time will help.

  3. #3
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    I had a slight occasional misfire which was fixed by changing the lambda sensor. Worth checking to see if the lambda sensor signal is as it should be?

  4. #4
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    Awesome thanks buddy. I'm making a check list of everything to look at, change or clean so all suggestions welcome!


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  5. #5
    Bod Jon's Avatar
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    Unless it's been done recently, I suggest cleaning the wire in the AFM Air Flow Meter.
    That should be considered a service item on 200SXs. Do it every oil change at least.

    Two screws, and then a gentle spray with carb cleaner or brake cleaner will do it

  6. #6
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    I have done that recently (about 3 or 4 months ago but definitely one to add to the list as it's a nice easy one! Thanks


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  7. #7
    Guest ChunkyTits's Avatar
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    I have this exact issue.

    Seems to be when cruising on the motorway around 60mph and it's intermittent. Recently had the plugs out and given them a good clean but they were replaced recently anyway.

    If you squeeze the throttle more the turbo kicks in and the misfire goes away, so i'm pretty sure it's electrical.

  8. #8
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    I had this on mine stuttering / hesitating on part throttle but fine on full . it was a leaky injector seal

  9. #9
    Guest ChunkyTits's Avatar
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    Interesting. Was. It allowing air in or something?

  10. #10
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    Nope just leaking lots of fuel

  11. #11
    Guest auz200sx's Avatar
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    S14 or S14a?

  12. #12
    Guest ChunkyTits's Avatar
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    S14a. Can't smell any fuel leaks

  13. #13
    Guest ChunkyTits's Avatar
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    My issue was lambda sensor. Unplugged it and the problem went away

  14. #14
    Guest ChunkyTits's Avatar
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    My issue was lambda sensor. Unplugged it and the problem went away

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