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Tom Gaynor;1560 I'm blaming new NGK plugs for now.[/QUOTE said:Tom, a slightly different situation, and I would not presume to try to change your mind, but in the course of any week we probably fit upwards of 60 new spark plugs, and possibly closer to 100. All of these are NGK of various types and in different applications. I cannot remember when we have ever had a failure due to substandard plugs.
What we do occasionally get is a plug which refuses to spark after an engine overheat situation. Another point I would like to bring up is the blast cleaning of plugs, which process I have seen mentioned on this thread. This has not been reccomended for many years as the blasting is likely to marr the glaze of the ceramic insulator, thus offering an earth path away from the plug electrodes.