what spark plug to use

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06-20-2010, 07:32 PM

ou812sm

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what spark plug to use

what spark plug to use in a 2003 lq9

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06-20-2010, 07:43 PM

caddy03pimpin

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AC Delco 41-985

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06-20-2010, 07:49 PM

Mangled03gmc

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NGK tr-55's or ^^^^^

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06-20-2010, 10:41 PM

Onetogofast

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I had the same question on my mind this morning, went to pick up TR-55's and ended up with TR-55ix's. I read on here you should gap the 55's to 60 because of the copper and to me that gap just seems wide, the recommended gap on ix's is 40 and iridium.......