replace valve cover gaskets & spark plug tube seals
NGK Iridium, is the best set of spark plugs for 200SX
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Under the valve cover there are seals on top of the plug tubes, you will need to replace the valve cover gasket and plug tube seals.
To change the spark plug seals on a Nissan Pulsar N15, first, ensure the engine is cool and disconnect the negative battery terminal. Remove the ignition coil or spark plug wires, then unscrew the spark plugs using a spark plug socket. With the plugs out, carefully remove the old seals from the valve cover and replace them with new ones. Reinstall the spark plugs, reconnect the ignition components, and finally, reconnect the battery terminal.
Could be a few reasons, and can't be pinpointed without me actually seeing it "in action". But here are the most likely reasons, in order of likleyhood: 1) Spark plug not tightened to proper specs. Fix: tighen plug to proper specs with torque wrench. 2) Spark plug "washer" bad or gone. Fix: Replace washer. 3) Spark plug seals bad. Fix: Replace spark plug. 4) Bad threads in spark plug hole. Fix: Retap, or "Helicoil" it. 5) Crack in head near spark plug hole. Fix: Replace head.
The spark plugs on a Ford Explorer are replaced by first disconnecting the battery. Remove the spark plug using a spark plug socket. Replace with the factory recommended spark plug.
It's probably The spark plug well gaskets. You need to remove valve cover and replace the gaskets for the spark plug wells and valve cover. it's a easy repair. It's probably The spark plug well gaskets. You need to remove valve cover and replace the gaskets for the spark plug wells and valve cover. it's a easy repair.
valve stem seals
Get a spark plug socket and unscrew the spark plug and replace with a new one.
Spark plug tube seals need changing
They seal oil/water/dirt out of the plug tube.