13 wrx misfire issue...strange fix
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This is a discussion on 13 wrx misfire issue...strange fix within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; So in my 13 for the past month or so I have had a rough idle/misfire like issue. The weird ...

  1. #1
    Registered User 99pgpgt's Avatar
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    13 wrx misfire issue...strange fix

    So in my 13 for the past month or so I have had a rough idle/misfire like issue. The weird thing about it was that it didn't happen all the time. It stopped doing it for awhile until this past Saturday when the engine light came on for a P0300. I cleared the code since the dealer was closed and drove. I ran the tank down low thinking it may have been a bad mix of gas. I filled up yesterday and the car felt fine. Consisten WOT pulls and everything. Until today..I get out of class, start my car and it is idling crappy as hell. Then as I'm pulling out, the engine light comes on. I thought perfect. So I went to the Subie dealership and let them check it out for the second time for this issue.

    Tech scanned it and the miss was jumping between all 4 cylinders!! Weird huh?

    So he comes out and talks to me for a bit. He mentions that there is a ground wire that splits into 4 separate wires and there has been issues of the connection coming loose. I thought, well, an electrical issue would make sense since it doesn't do it all the time. He peeled back the wrapping and dropped some solder on the connection and what do you know...The miss is gone and it is smooth as hell.


    Just wanted to share this with anyone who may have the same odd miss issue with their 08+ WRX or STi.

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    Pro Manscaper Mikie13's Avatar
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    Interesting. Seems like some of these kinds of issues have come up recently too.
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  4. #3
    Registered User 99pgpgt's Avatar
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    Interesting is right!!!

    Originally I thought that maybe it was one of the common vacuum leaks. When I took it in before they showed that vacuum was fine. No leaks. And, that the 13 computer has advancements over the 12 model year that will set an engine light the minute there is a vac leak..Now, idk how much of a bull**** line that is or it could be true. But I really was not happy and I was relieved when the engine light came on.

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    Registered User 99pgpgt's Avatar
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    This is the section of harness that the wires are located in...


  6. #5
    Registered User cogito's Avatar
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    Good to know, as a 2013 WRX owner (5K). Will file that one for sure. Thanks
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  7. #6
    Registered User Zitro's Avatar
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    I'm having the exact same idle issues on my '13, but I haven't thrown a light yet (2300 miles on the clock). Maybe when I swing by the dealership for my first oil change I'll have them check this. Thanks!
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