2003 GMC Envoy Seized spark plug

2003 GMC ENVOY
186,000 MILES
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RENAMARIE05
  • MEMBER
  • 2 POSTS
Scan tool reads misfire cylinder 6. This is the one that is up under the cowl on my 2003 Gmc Envoy SLE 4.2l. The plug is rusted in there pretty good. Any suggestions on how to get that thing out without breaking it?
Aug 16, 2013 at 8:04 AM
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WRENCHTECH
  • ✓ASE Certified Mechanic
  • 20,761 POSTS
  • ASE Certified Mechanic
If you actually have rust on a spark plug, then you have water/coolant leaking back there.
Soak it down with penetrating oil overnight before removing it and make sure you use a spark plug socket.
Aug 16, 2013 at 9:19 AM
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RENAMARIE05
  • MEMBER
  • 2 POSTS
Thanks for the reply. I soaked it over night in PB and got an extended spark plug wrench. Finally got it loose!
Aug 16, 2013 at 5:13 PM
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