I have a 2002 Honda Accord Ex v6 with 212,000 highway miles. My check engine light came on a few months ago along with my tcs light. I took it to a mechanic who said I have all 1-6 cylinder misfires. He cleaned my injectors and replaced all spark plugs for $220 ( rip off I know). Three days later my check engine and tcs lights came on again. So I hooked it up to the code reader which read back cylinder 4 misfire. I then replaced the cylinder 4 ignition coil. Still no luck when I start my car it bogs out like I'm running out of gas (which I'm not). I took the car to the Honda dealership paid $85 for them to suggest a valve adjustment and then they will check the car again. They pulled engine fault codes po300-p0306 and random cylinder misfire. I'm running out of time my tags expired in December and I need a smog to get my sticker. Any suggestions where I go from here?

 

p0306 is #6 cylinder misfire. Swap coils with another cylinder, clear codes, and restart and drive. If trouble follows the coil pack is bad.

 

Do exactly that

 

The coils tested fine the dealership suggested a valve adjustment I bought the car with 70k it now has 213k I've never had a valve adjustment

 

Of course the dealership recommends a valve adjustment (wouldn't hurt though) that's bookoo bucks for them to year the heads off an engine. I would tear it down myself and take the heads to a machine shop. Save yourself some money.


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Do you have your last emissions test report?

Was your NOx creeping up? A misfire can be caused by a lean condition, if the EGR system has never been cleaned it may just be time to clean it out, if this is the case then there isn't a problem with the ignition system. It may simply be an issue with the EGR system not flowing enough, which then can cause a misfire.