[SOLVED] 2006 DENALI Envoy SparkPlug Electrode Wear - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Vortec 5.3L V8 Engine and Drivetrain > Engine Tunes/Mods

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  #1  
Old 03-14-2017, 07:40 PM
Jkb242 Jkb242 is offline
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2006 DENALI Envoy SparkPlug Electrode Wear

I inspected a couple of my spark plugs after original posting a thread on a misfire on one cylinder which has since been resolved. I have found two additional plugs that do not show abnormal mixture issues but have shown the same center electrode wear which looks abnormal to me. Comments concern thes pictures are very much appreciated. Thanks
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Old 03-14-2017, 07:51 PM
Jkb242 Jkb242 is offline
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Old 03-14-2017, 08:58 PM
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AWD V8 AWD V8 is offline
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Those plugs look fine, other than you are burning a bit of oil.
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Old 03-14-2017, 10:30 PM
Jkb242 Jkb242 is offline
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Thanks very much I wasn't aware that the center electrode began pointed. The one I replaced was not like this when replace and it was an AC DELCO iridium.

Thanks again!!
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Old 03-14-2017, 10:57 PM
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Yes the Iridium plugs have a very small pointed tip new. They last a very long time, so you should always coat the threads with an anti-seize compound so they come out easy next time.

The Iridium tip is very tough, but once the Iridium is worn off the electrode wears very quickly. So it's not uncommon to have 7 plugs that look worn very little and one plug with an electrode burnt down to a nub.
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Old 03-14-2017, 11:38 PM
Jkb242 Jkb242 is offline
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Thanks for the additional info. I'll double check the plug I purchased which was indeed suppose to be iridium.
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