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Support >>> Title: Corona stain
Added:2010-3-31  Click:7204   

A brown stain deposited on the insulator.Generally,if spark plugs installed into four cylinders engine,two of them will have this problem.

Cause:The air ionized at 20kv-30kv high voltages and the impruity of air adhered to the insulator surface.

Action:There(s no deterioration to the function of spark plug.

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