My ‘02 s2000 recently started having a shaky idle and threw a misfire code this morning for random, cylinder 1, and cylinder 2. I was going to try swapping plugs and coils from 1 & 2 to 3 & 4 and see if the misfire follows. Upon removal, I noticed my cylinder 3 coil pack to have a burnt looking deposit? Possibly from a poorly seated spark plug? I am still going to do a compression check and swap them around, but was wondering if this coil pack should be changed anyways even though it was not in one of the misfiring cylinders. Coil packs and spark plugs are original to my knowledge with 114k miles on them.




Thanks in advance for any input!
Brett

 

Perhaps the spark plugs were not initially tighten correctly. Go to 24 ft-lbs, on the new ones.

 

If you change one coil pack, you'll be changing the rest shortly.