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Re: water leaking from spark plugh
Water / coolant coming from a spark plug hole is not good. However since you have a rotary engine, the probale cause is an o-ring that has gone bad. The older rotary engines were notorious for the o-rings going out. The o-rings seal the combustion, oil and coolant passages. The engine will need to be resealed. Hope this helps.
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Remove that plug and turn engine over. Does water shoot out of the spark plug hole? Head gasket leak, cylinder-to-coolant channel side. Do you see any water vapor or actual water out of your exhaust when you first start it?
Exhaust leak? Please describe. Make sure correct spark plugs were used (I think gap distance makes a difference, but ask a local mech or store parts employee) and the intake manifold is put back on with correct torque specs. Make sure there are no leaks in the air intake hose, air box, etc as this will effect performance.
check your spark plugs, distributer cap and cables, sometime the wire leaks, if you put your car in the dark place during the night, turn on your engine, see if there is any spark from the cap and cable. if you see some spark, change it.