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· Super Moderator
2004 Civic EX (es2)
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76 Posts
No easy answer on this one. It could also be a valve guide and seal but the answer is still the same..pull the head and see what happened. If you don't plan to rebuild it you can try replacing the plug and see how far you get spraying bugs.(it's bound to be smoking) If you find a crusty valve then a head job might fix it, but if there is any scoring on the cylinder wall it's doomed to a full rebuild/replacement.
If you do find a head/valve problem is the likely culprit, I recommend replacing the timing belt, water pump and front main seal as well as other belts while you are in there. I also recommend finding OEM parts over the box store chineseum.
Hope this helps!
 
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