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Spark plugs

Tiny
KHOLDER
  • MEMBER
  • 1989 OLDSMOBILE DELTA 88
  • 6 CYL
  • FWD
  • 200,000 MILES
How do I determine by looking at spark plug if it has gone bad or fouled.
Sunday, May 15th, 2011 AT 3:46 PM

2 Replies

Tiny
PROTECH1980
  • MEMBER
  • 901 POSTS
Check this link, it will assist you with pictures: http://www.gnttype.org/techarea/engine/plugs.html
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Sunday, May 15th, 2011 AT 4:08 PM
Tiny
FIXITMR
  • MECHANIC
  • 9,990 POSTS
If it's firing, the post and tip will be dry even if it's not especially clean looking. If not firing it will be darkish and damp/wet. The most common fault with newer cars since 80's is plug just wears out. Tips and posts wear down and this changes gap. Look at all plugs as a group to find a problem with 1 or more. Mark which cylinder each came from to determine if off color/dead plug indicates cylinder itself has a problem with air/spark/compression/fuel.
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Sunday, May 15th, 2011 AT 4:24 PM

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