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Discussion Starter · #1 ·
Ok so on my wife’s 2014 terrain awd 2.4
I replaced plugs with what came out of it
Ac Delco iridium plugs
The ones that came out were gapped at 30
The new ones I got are gapped at 30
I have read online mixed comments of .35 to .40
Can someone please tell me what is correct
I know box says pre gapped do not adjust
 

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from ACDELCO site for 2014 2.4

Spark Plug

Iridium

Part# 41-108 - ACDelco
Part# 12681658 - GM





Per Veh: 4

Years: 2012-2017

OE; GAP .035; GAP PRE-SET AT FACTORY, DO NOT RE-GAP
 
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2010 chevy equinox 2.4
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Oe gap I'm pretty sure was .036 on my 2010 2.4 with the same plugs changed them out like 15k miles ago had checked the gap on 1 it was dead on... I cant believe the ones you got are .030 and mine were about just under .040 interesting.... Either way it wouldn't make a difference since the electrode is such a hard material, gapping on older cars makes sure they wear evenly.
 

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could they be New Old Stock?

maybe the original spec was .30
and some yrs later--- it was changed to .35?

thinking out loud...
 

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ok, I remembered that some manuals will show the gap.
so looked up the 2014 Equinox manual- and this is what it shows for the 2.4

Spark Plug Gap
2.4L L4 K Automatic 0.75–0.90 mm (0.030–
0.035 in)
 
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My 2011 Nox 2.4L uses the same 41-108 but the gap spec is .040. It is pre gap at .035. I installed them and noticed lack of power/torque at low end. Pulled them out and re gap at 0.040 and notice the difference right away. You can regap by carefully not touching the electrode at all. There are regap tools.
 
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