Cylinder 1 and 2 coils look like this

Car runs ok, small intermittent stutter at idle but fine otherwise.
I just replaced the plugs but if the old ones were not tight enough they were like than for 50k miles.
Just did a valve lash adjustment... Exhaust was all too tight.

3 and 4 still look brand new.

 

What torque number did you tighten them to?

 

"Feels tight !!don't strip the aluminum!!"

Clearly perhaps I underestimated aluminum

 

Torque spec is only 13ft lb. Most likely the coils are failing. My coils looked similar when my Fit developed a mis-fire.

 

Ive seen people quoting 20ft lb but I couldn't find any official documentation (at least that I can access). I did find this TSB for the 08 accords that mentions 16ft lbs and thats what I went with (https://static.nhtsa.gov/odi/tsbs/20...42434-9999.pdf) page 13.

I would first try replacing the boots of the coils (part number NGK 59024) and cleaning the bottom of the coils. Some videos on youtube show this whole procedure.

 

Thank you!
The plugs I pulled all looked the same and honestly looked fine, but I hope I'll never have to do anything with them every again having replaced with NGK iridium at 177k