I have a 2006 Honda Accord EX v6 with 156K miles. When I was replacing the spark plugs, one of the plugs seemed to have gotten loose over the course of the last 60K miles (when I replaced the plugs). I probably didn't torque it correctly last time. The coil and the chamber were blacken as a result and the plug itself was covered in with soot. I haven't had any issues with starting or idling. Any thoughts on if I would need to replace the ignition coil as a precaution or take any action with the chamber? All other 5 plugs, coils, and chambers looked fine.

Thank you for advice and help!

 

You can clean it if you want to. If it works it works

 

Thanks Sean, the certain I would have, which is what drove me to replace the spark plugs, was a noticeable drop in my MPGs. I thought if replacing the ignition coil that is with the spark plug that is loose, might help. I can't tell if its functioning correctly or not.

If I did replace, is it recommended to go OEM or aftermarket?

 

The drop in MPG can certainly be explained by the loose spark plug, resulting loss of compression, even without any damage to the coil. Does the check-engine light come on at all during driving? (presuming that it DOES come on during the bulb-check sequence when you first turn on the key)

I would clean the coil and check it carefully, especially look at the rubber seal at the bottom, that fits around the spark plug. Assuming no visible damage, I'd put the coil back in. If you continue to see poor MPG, then you can get a new coil without wasting too much effort just changing the coil.

 

Hi Jim - The check engine light does not come on after the initial starting sequence. Yes, maybe that is the best approach. I should have taken a picture before putting it back, but the coil, at least on the outside was blacken all the way around top to bottom, but the rubber seal was intact and no visible breaks in the coil itself.

 

Go OEM. I would say there is nothing wrong with the coil or you would of gotten a misfire after putting it back in. If you clean and put it in and there's no misfire you are good to go. If you decide to replace go OEM. They are proven to be a brand to last over 200k

 

Sean/Jim - Thank you very much for the help and advice, really appreciate it. I'll hold off and check MPGs to see if the new plugs, cleaning the coil, and tighten it all up properly fixes the MPG issues. Thanks again.

Ted