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2003 GMC Sierra 2500 HD Plugs


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I'm a bit confused on what plugs to install and what gap? I can't find any recent post on the web to confirm if the gap is 040 or 060. If I should use platinum or iridium?

 

I went to Advanced Auto and bought AC Delco plug wires and AC Delco platinum plug No.41-962. Those plugs are gapped at 040. Do I leave them alone? Do I get different plugs?

 

Any guidance is appreciated. Thanks

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Is it an LQ4 or an LQ9? If it's the LQ4 which was the most popular engine it uses a platinum plug GM# 19299585. AC-Delco replacement is the number you posted No.41-962 and they come pre-gapped at .040

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So are you saying even if I pull my plugs out and they are platinum and gapped around 060 I should put the new platinums in at 040 and not try to gap them to 060 as my owners manual is telling me? AC Delco website doesn't show a iridium plug for my truck. I know their out there but I want to stick with AC Delco if at all possible.

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So are you saying even if I pull my plugs out and they are platinum and gapped around 060 I should put the new platinums in at 040 and not try to gap them to 060 as my owners manual is telling me? AC Delco website doesn't show a iridium plug for my truck. I know their out there but I want to stick with AC Delco if at all possible.

 

 

GM issued new guidance around 2004 or 2005 to gap to .040 instead of .060

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