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You have leaking spark plug grommet/seals under the valve cover, and most likely being a 91, also have leaking cam tower o-rings. The first is just a matter of replacing the valve cover gasket set. The second requires removal of the cam tower/rocker arm shaft assy. to access the o-ring seals between them and the head. If you are not an experience mechanic, I do not recommend doing this yourself. It is easy to damage parts and bend valves if you don't seat it properly.
well there are two options., your valve cover grbomets for spark plug tubes are bad,specificly #1 or spark plug tube has to be remove and reseal, while doing this if not have acces to an special removal tool you need to remove valve cover, take this has an oportunity to replace valve cover gasket and all gromets(spark plug tube 4, and vlebe 8 small that look like a washers on each bolt) the tubes are treat in remove with locking plyers clean treaths on a wire wheel apply black silicone and reinstall.
The spark plugs do no thave gaskets they are a tapered fit into the cylinder head. Do you mean the seals (2.0 DOHC) that keep oil out of the plug wells, if so you must remplace the valve cover gasket, a very simple job on this engine.
If you have a 2.2 L , 5SFE engine, chances are high that the distributor is faulty. I've replaced mine every 3 years. I started reading about this, and found out that oil gets inside of it due to a seal going bad. According to others, the bearing for the distributor gets oiled from oil mist due to it's location under the valve cover. The seal fails and kills your coil or pickups. It's an all in one unit, so any one part failing takes the whole thing down. You'll know if your distributor is the same as mine if you do not see a 5th spark plug wire, you will only see 4 spark plug wires, a 2 prong plug, and a 4 prong plug. The 2 prong plug is the 12 Volt supply to the coil primary. The 4 prong plug is the pickup feed to the ECU.
U got a damage oil seals in the plug housing!
Replacing it, needs to take off the VALVE COVER and spark plugs.
Check how the seals seat on ur valve cover, sometimes it needs to be cleaned up and put a silicone gasket maker, that will seal everything!
If the oil is not in the cylinder,and is just around the spark plug,then get a new valve cover gasket with grommets,and spark plug seals,and replace it,if it has oil in the cylinders,it should be smoking,when running,and using oil.
Label and disconnect the wires from each spark plug one at a time.
Remove the spark plug wires from the distributor cap. On some models you may need to use a flat bladed tool to lift up the lock claw and disconnect the holder from the cap. Separate the wires at the grommet.
Make sure to remove the spark plug wires from the boot end and NOT from the wire itself
Lift up the lock claw and disconnect the holder from the cap
Do NOT pull on the plug wires to remove them, this may damage the conductor inside.
Pull the plug wires from the retaining clamps.
Attach the holder and grommet portion to the distributor cap. Make sure that the holder is installed correctly to the grommet and cap.
Align the spline of the cap with the spline groove of the holder
Make sure the holder is correctly installed to the grommet
Check that the lock claw of the holder is engaged by lightly pulling on the holder.
On the center cord, insert the grommet and holder together.
There are a few places it could be leaking from, first it could be a cooling line leaking, secound if its got a detent cable it could leak from there, third it could be leaking from dip stick tube, forth oil pan could have a hole in it or gasget is leaking, fith front pump seal or rear seal could be leaking. Everything can be fixed with trans. in car except front seal witch requires trans to come out.