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2015 Equinox LT 2.4L AWD / 2009 Torrent GT 3.4L AWD
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Discussion Starter · #1 · (Edited)
I appreciate someone can educate me why the carbon buildup on the spark plugs are not the same. The one in cylinder 1 is the worst and the 4th one is relatively cleaner. Thanks.

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On the 3.6, i believe the number 6 is always the dirtiest.... if im not mistaken, its the plug closest to the pcv valve on the valve cover... the pcv tends to clog up the little breather holes....
Is there a pcv near your dirtiest plug?
 

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2015 Equinox LT 2.4L AWD / 2009 Torrent GT 3.4L AWD
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256 Posts
Discussion Starter · #3 ·
On the 3.6, i believe the number 6 is always the dirtiest.... if im not mistaken, its the plug closest to the pcv valve on the valve cover... the pcv tends to clog up the little breather holes....
Is there a pcv near your dirtiest plug?
Thanks RBarrios. Yeah, cylinder 1 is directly above the PVC on the 2.4L and to the left are the VVT solenoids.
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2012 GMC Terrian 2.4L Ecotec LEA 125k Miles
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My opinion I don't think there is much carbon build up. I did a spark plug change in 2020 and took a picture.

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2015 Equinox LT 2.4L AWD / 2009 Torrent GT 3.4L AWD
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Discussion Starter · #5 ·
@Ebeo1 , your plugs are the same as mine that some are more dirty comparing to others. Thanks for sharing.
 

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2012 GMC Terrian 2.4L Ecotec LEA 125k Miles
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Since the factory recommended interval is 97,500mi. they really don't look that bad.
My cam shaft positioner went bad about that time. My car would stumble on acceleration and stall at red lights. That's when I got proactive and changed the plugs at the same time as the positioner.

I took my car to my independent shop after that for the big maintenance period which I think is the 97500.
 

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2013 GMC Terrain SLE-2 3.6L Crystal Red Tintcoat
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I'm holding out as long as I can with the plugs on my 3.6L. It only has 73,400 on the clock, plus I hear it's a PITA to change them out.
 
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