Assuming it is oil on the outside of the plugs in the holes in the head, there are two places for oil to get in. The easy one to fix is the seals between the valve cover and head. A gasket kit includes the cover gasket and four large o-rings to seal the holes. Torque on the nuts is 10 ft-lb (I think). From personal experience, the problem is more likely the seals between the rocker shaft mounts (that also form part of the spark plug holes) and the head. Replacing these is a little more involved since the rocker assembly (and cam?) have to be removed. I periodically remove the plugs and clean the plugs, wire boots, and the holes, then reinstall the plugs. If mine makes it to 300,000 miles, I may replace these seal when I do the timing belt and water pump.
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They are under the plastics which are on top of the value cover which has your oil cap on it. If its a SOHC engine there should be four wires going into the value cover,therefore resulting in 4 spark plugs. If its a DOHC it also has 4 spark plugs. If you encounter more problems feel free to ask.
You have a 4 cylinder and there are seals in the cover around the spark plug holes. You can replace these with a rocker arm cover gasket set. Costs about $25.00. The oil does not hurt the sparkplug, but over time it will affect the plug wires/ boots and cause a misfire. these are not hard to replace. Your call.
This sounds like bad sparkplug wires, pull wires off the plugs and see if oil is on wires, this is common on these cars the valve cover gasket goes bad and oil leaks into sparkplug holes and then it misfires, if theres oil in holes replace the wires and the valve cover gasket with the tube seals,
The spark plugs, if getting wet from the engine oil dripping off of the valve cover gasket, is not good.
The boots of the spark plug wires will prevent the contacts from getting oily, but not for long. I would have the valve cover gasket replaced to prevent this from happening. It's not good to get the spark plugs and wires wet with engine oil.
They are underneath the coil that each cylinder has-you'll see 6 "coils"-three to side-on top of each valve cover. Remove the wire connector from the coil-remove two screws holding each coil to valve cover-carefully pull coil up away from valve cover. If it is stuck-slightly rotate coil back and forth to break it's hold on the spark plug. Use sparkplug socket and long extension to reach sparkplug down inside of valve cover. Driver's side of engine you will find one sparkplug difficult to get because of interference from brake system components. Use TWO short extensions coupled together to reach plug-when it becomes unscrewed from cyl head-lift it up-pull off one extension to clear obstruction-then pull the plug out from valve cover. (I bet you'll see some oil inside the hole where sparkplug was-(sparkplug may be wet with oil-there are seals that keep oil from leaking out of vavle cover). I DID NOT bother to replace the seals-my Rodeo is running just fine with 317,000 miles on her.
to replace spark plugs remove spark plug wire boots. use special sparkplug socket or else you can break the sparkplug. to remove turn ratchet counterclockwise remove all four one at a time, make sure that the sparkplug gap is correct. most plugs come pregapped...read the box it will tell.you. do not overtigheten plug once it has fully seated give it a good snug....if you do one at a time you dont need to mark the spark plug wires. if you mix up the wires your car will back fire which could cause severe internal damage.
To fix this, the valve cover seal needs to be replaced. It is not the cover seal itself but the four rubber seals under the cover that keep oil out of your spark plug tubes. This is a simple fix and do not use silicone for any part of the repair.
thread dammaged in head causing spark pug to come loose can fit heli coil to fix thread in head so spark plug wont come loose and leak oil into tube. other places oil can come from to cover plug in oil
remove rocker cover then remove spark plug tube they are screwed into head and clean thread of tube and apply sealant loctite to thread refit to head and may pay to replace seal for top of spark plug tube that is in rocker cover
one of these or both can leak, if tube is tight in head it may not be leaking the top seal is