1995 Ford Escort Q&A
1995 Ford Escort Question: #4 plug not firing and oil in air filter.
I am assuming you have checked for spark? Bore scope (or maybe with a flashlight) look in the spark plug hole and check cylinder 4 to see if piston is damaged. Burnt valve or valve seat will not put oil in the air filter. However a damaged piston from a 'dislodged valve seat' SURE WILL! If any piston damage you need an engine as the head is also trashed and not worth fixing. (Car pretty nice and in good shape?) I have had 3 of these engines in the last 2 months that turned out just as i have described, so that is why i am telling you this! Any compression on 4? Was the spark plug damaged at all like the gap mashed shut? Is it or was it knocking at all? Let us know what you find. I really do hope i am wrong, good luck. - pushrod
not uncommon for older car,maybe its time to replace - globalhelper