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    Haibeck Automotive Technology





A common source for a misfire is arcing in the spark plug boot. Air can ionize and become more conductive. This can cause an arc adjacent to the spark plug insulator and eventual carbon tracking that makes the progression of the failure get worse.

This misfire feels like a stumble when the throttle is opened at light engine load. Usually going beyond 50% throttle will make the misfire go away because the arc voltage requirement of the spark plug gap does down as load increases.

It is not necessary to replace the spark plug wires to resolve this problem. Replace the spark plugs. Apply dielectric grease on the inside of the wire connector boot. It will displace the air and resolve the problem. Use of dielectric grease will also prevent the problem.