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1992 3.1L V6 Firebird - Spark Plug

Tiny
COLINHUGG
  • MEMBER
  • 1992 PONTIAC FIREBIRD
I have a '92 3.1L V6 Firebird that is burning up plugs. I replaced all six plugs about 2 years ago and about 4 months ago I took it to a shop where they had determined the insulator on one of the plugs inside the head had disintegrated. They did a compression check and I had 150 psi in the head. Now after running fine the last 4 months, it's acting the exact same way. What would cause a spark plug to burn up an insulator like that and what happens to the pieces of the insulator in the combustion chamber? Thanks in advance.
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Monday, August 13th, 2007 AT 12:47 PM

3 Replies

Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
You are probably running to lean in that cylinder, re check compression and wet test as well. If ok check the injector.
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Monday, August 13th, 2007 AT 3:30 PM
Tiny
COLINHUGG
  • MEMBER
  • 2 POSTS
What's a 'wet test'? Can an auto parts store check that, or does a shop have to do that?
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Tuesday, August 14th, 2007 AT 12:26 PM
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
A wet test is a compression test with a few drops of oil in the cylinder before it's cranked. If reading is higher, it needs rings!
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Tuesday, August 14th, 2007 AT 4:39 PM

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