Spark Plugs
Thread Starter
Burning Brakes
Joined: Sep 2002
Posts: 1,009
Likes: 62
From: Houston Tx
Spark Plugs
Hi all, what's the correct spark plug gap for AC Platinium plugs for a 2001? I know the owner's manual says 0.06 inches for the original Denso (#PTJ16R15) plugs. The auto parts store says the AC Delco plugs should be on 0.04. Which is correct? Thanks.
Last edited by hgoodwiniii; Feb 26, 2014 at 08:36 AM.
Instructor
Joined: Jun 2010
Posts: 228
Likes: 2
From: California
My results were the other way. I couldn't tell any difference in power but the idle was smoother with the Iridium's.
Thread Starter
Burning Brakes
Joined: Sep 2002
Posts: 1,009
Likes: 62
From: Houston Tx
Ok, looks like the between the AC delco 41-110 and the AC delco 41-962 is Iridium vs. Platinium. I have the 41-962 which I'm ok with. I'm thinking I will just go with 0.06 on them and see how it runs?
Last edited by hgoodwiniii; Feb 26, 2014 at 03:36 PM.
Melting Slicks
Joined: Jun 2012
Posts: 3,163
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From: Oceanside California
New factory spec is .040" , original was .060". I gap to .050"-.055" and it helps smooth the idle as well as keeping close to the original planned spec for the engine. Generally you want the wider gap, but not at the sacrifice of idle and allowing misfires.
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St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16
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From: oregon
that gap difference might be worth 5-7hp tops
for those of you wondering what i mean, smaller gaps are more detonation resistant and safer, but, they make less power than larger gaps....which are more prone to detonation
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