Noob here.

OBD II code: P301


2006 Civic w/ 148,000 miles. fresh Denso Iridium plugs at 101,000. therefore only 50,000 miles on new plugs. One owner. As of 5-11-12 Fresh oil change, Coolent within operating range.




from the research on white tips i have found the following: coolent (fins not working properly,low), headgasket, leaking, low oil, low octane.


Anything you DIY or mechanic can help out with?????

Thanks!

-z

 

https://picasaweb.google.com/1059540...74654341588610


pic of plugs

 

Have you considered that it may just be a bad coil or plug? Replace the plug, if the misfiring persists swap the coil with a different cylinder (I suggest #4, as it is farthest away in the firing order), and see if the problem follows the coil. If it stays with cylinder 1, swap the fuel injectors next.

I don't think the 2006 has adjustable valves but I'm not familiar with the late models. The ones with adjustable valves can misfire because the valves need adjusting.