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I have a 1.5 liter Mitsubishi Mirage, 1995 model that is burning oil and the #4 cylinder spark plug is covered in oil or carbon. I replaced the spark plugs and the engine ran fine for a few minutes, but it went back to skipping. I pulled the new spark plug and it was covered in black.
Smoke does come from the exhaust, but not all the time, it’s intermittent and the owner does have to fill the oil after a major smoking episode.
I was thinking either a head gasket or the valve oil seals for cylinder 4, but would that be a correct assumption since the smoking problem intermittent? Would a PCV system problem be more likely? I didn’t think PCV due to the major Carbon / oil buildup in the cylinder, I was thinking more a gasket / seal issue.
I would love to hear everyones opinions.
Thank you,
Gary
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