Platinum to iridium plugs / PCM update?

By rjirvine
June 10, 2005 in Ask A GM Technician

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rjirvine

Posted June 10, 2005

I put a set of new iridium plugs (41-985) in my 2000 Silverado extended cab with a 5.3 engine. Since they are gapped at .040 instead of the .060 the platinums had, is there anything that needs to be done as far as a PCM update?

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