before valve cover repair engine idle was rough , repaired leak ,changed spark plugs,wires & coil pack. the location of the oil leak is the cylinder that has been the problem. lifter sounds a little loud also on this cylinder , could the ignition control module have gotten ruined from this leak?
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1992 Mazda Miata MX-5 Question: will valve cover leak into spark plug hole ruin ignition contol module
Answer #1patrick mannion from Greg Solow's Engine Room, September 08, 2009, 23:49Master
Oil leaking past the spark plug tube seals in the Miata Valve cover often causes plug wire failure and or a misfire. I don't think the control module would fail. Try using the engine oil additive Risolene each of your next few oil changes see if that helps clean the hydraulic lifters.