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304 code persists

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Old Apr 3, 2021 | 06:39 PM
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turbotommybahama's Avatar
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Joined: Apr 2021
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From: Columbia
304 code persists

Good day all, have a 2008 Honda fit. Keeps throwing a 304 code. I changed the plugs and the coil on cylinder 4. I cleared out the code but it comes back. If I just start it and drive it won't throw the code but if I let it idle when it's cold it'll throw the code(and I can feel it running rough). My mechanic thinks it needs valve adjustment. It doesn't seem to throw
the code after it's warm and at idle and I can't feel the miss. Someone said maybe a bad injector .
Does anyone have any ideas?
 
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