Question about 1990 Subaru Legacy

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I have a 1990 Legacy 5 spd. One of the sparkplug caps. keeps popping off causing the motor to lose its cycle. What is causing this?

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Is this one of those plug boots that also seals the hole in the cylinder head around it? The plug might be loose,or missing a gasket(if it is supposed to have one).This would allow cylinder pressure to blow the boot off. Or,maybe the plug's porcelain insulator is allowing cylinder pressure to blow inside the boot.

Posted on Oct 27, 2012

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Posted on Jan 02, 2017

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