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2003 GMC Envoy Seized spark plug

Tiny
RENAMARIE05
  • MEMBER
  • 2003 GMC ENVOY
  • 186,000 MILES
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?
Friday, August 16th, 2013 AT 8:04 AM

2 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
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.
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Friday, August 16th, 2013 AT 9:19 AM
Tiny
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!
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Friday, August 16th, 2013 AT 5:13 PM

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