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International Automotive Technicians Network
Re: IRIDIUM SPARK PLUGS
Posted to Technical Discussion Forum on 3/13/2020

I doubt they were worn, likely the plugs were set wrong in the first place. The manufacturers of these plugs do not recommend us changing the gap from new. At least of the 4 or 5 brands I normally use.

You likely already know iridium is used because it does ... Login to read more.