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Thread: Intermittent misfire issue

  1. Top Of Page | #1
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    Intermittent misfire issue

    Ok, I'm having an intermittent issue over the last two weeks where my 02 2.5 manual outback wagon will randomly start running only on cylinders 1 and 2. First time it happened the only code it threw was p1581. After looking around for a bit seeing nothing out of the ordinary I restarted and it ran fine. About a week later it happened again and I shut down and restarted with no issue. The next time it happened I pulled a code of p0171, again it restarted with no issue. The last two times it happened the only codes were misfire on 3 and 4. Now a couple things I noticed during this, occasionally the obd port wouldn't connect and when it happened while driving the throttle became ULTRA sensitive. Anyone have any ideas?

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    System Operator IGOTASUBARU's Avatar

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    Re: Intermittent misfire issue

    Is your Subaru all stock?

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  3. Top Of Page | #3
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    Re: Intermittent misfire issue

    Quote Originally Posted by IGOTASUBARU View Post
    Is your Subaru all stock?

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    UEL headers and catless midpipe with a high flow muffler, stock otherwise

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  4. Top Of Page | #4
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    Re: Intermittent misfire issue

    Interesting tidbit, removing the plug wire for one or two and replacing it the misfires stop. Can I blame the coil?

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  6. Top Of Page | #5
    System Operator IGOTASUBARU's Avatar

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    Re: Intermittent misfire issue

    When was your last tune up?

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  7. Top Of Page | #6
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    Re: Intermittent misfire issue

    Full tune up when I bought it last year, did the timing last month

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  9. Top Of Page | #7
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    Re: Intermittent misfire issue

    For a little more detail, I pulled the wire for 4 while running and misfiring and saw nothing. I did the same for 2 and got a strong spark so I quickly reinstalled and the idle smoothed immediately. A few minutes later, after idling while I looked around, it started misfiring again so I repeated the wire pulls but on 3 and 1 with the same results. Also I have to add, it only happens after running for a while and the engine is hot

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  10. Top Of Page | #8
    System Operator IGOTASUBARU's Avatar

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    Re: Intermittent misfire issue

    Well here's what that code could be.

    - Intake air leaks
    - Faulty front heated oxygen sensor
    - Ignition misfiring
    - Faulty fuel injectors
    - Exhaust gas leaks
    - Incorrect fuel pressure
    - Lack of fuel
    - Faulty Mass Air Flow (MAF) sensor
    - Incorrect Positive Crankcase Ventilation (PCV) hose connection
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  12. Top Of Page | #9
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    Re: Intermittent misfire issue

    Thanks, but this is where it gets interesting, the first two codes only showed once and haven't returned. They showed one then the other, each leaving after a drive cycle

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  13. Top Of Page | #10
    System Operator IGOTASUBARU's Avatar

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    Re: Intermittent misfire issue

    Did you get any other codes?
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