Engine/Power - EJ25T (STI and 2006+ WRX) Discussions about the USDM 2006+ WRX and WRX STi 2.5 liter turbo flat-four.

p0304 misfire code after catback install, anyone else?

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Old 03-04-2005, 03:20 PM
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p0304 misfire code after catback install, anyone else?

installed a tunabe catback exhaust,drove for 2 days and cel light. scanner says p0304 misfire #4. the dealer can,t see me until 3/10. anyone else had similar exp?
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Old 03-05-2005, 12:21 AM
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wow thats a new one, have a feeling its not related to the catback though, pehaps just coincidence. Catbacks dont cause #4 cyl miss fires, let us know, Im interested.
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Old 03-19-2005, 08:47 AM
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it was a bad fuel injector? they said that compression was fine but i'm bummed out. the car hauls ***
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Old 03-20-2005, 11:32 PM
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wow, first one of those I've heard just fail, guess every part has a certain failure rate though, glad they got it sorted for you though
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