So I need some help with a misfire issue that I am having with my stock 00 Honda Civic SI. The car has new NGK spark plugs, NGK spark plug wires, and new cap n rotors with maybe about 4,000 miles on them. I double check and triple checked all the work that I did but when I pulled the spark plug from cylinder #4 I found some kind of silver/brownish fluid on the top of the spark plug threads. So I am guessing my tube seal are bad and that is what is causing the miss fire. What doesn’t make sense to me is shouldn’t the whole spark plug/tip be wet to cause a mis fire? The hole where the spark plug goes in looks good, the spark plug boot is clean, the top half of the spark plug is clean., peeking through the top the piston looks dry. What else can be the problem? What else should I check? I know next I have to check compression and fuel, what are things that I need to look for when checking those. Any info helps. Thanks.

 

Did you put anti seize on the threads of the spark plug?

If not then that could be coolant or oil or both.

And either can be the cause of a miss

 

yes there is anti seize on the spark plug.

but shouldn't the whole spark plug (threads all the way down to the gap) be wet with any fluid to cause a misfire? not just the threads?

 

Post all CEL codes that are thrown.

 

Check the seats on the plug wires, do the have build up, check your dizzy internally, make sure the rotor is contacting all the posts, check the threads on spark plug seat if their clean for good grounding, check your engine grounds if they broke away.

Another thing to test is pull out the spark plug and get some wire, then wire pos to the post, neg to the threads and look for good spark to rule the spark plugs out. Use a multimeter on the spark plug wire and run a continuity test.


And just from scrolling up again, seeing shiny metal on the lower part makes me think its not seating all the way.