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1994 Chevy Truck spark plug blew out porcelain while runnin

Tiny
MIKEPAUL
  • MEMBER
  • 1994 CHEVROLET TRUCK
1994 Chevy Truck 6 cyl Four Wheel Drive Manual

spark plug blew out porcelain while running
what would cause this?
Friday, October 10th, 2008 AT 5:45 PM

3 Replies

Tiny
BLACKOP555
  • MECHANIC
  • 10,371 POSTS
Did the plug blow out of the hole/

check to see if the bridge of the spark plug is bent or the plug is damaged, such as being struck by a piston.

If no damage is noted chances are the porcelain was poor, dropped and then later it cracked due to normal operating conditions.
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Friday, October 10th, 2008 AT 7:28 PM
Tiny
SWILLIAMS
  • MECHANIC
  • 597 POSTS
To add a few others I have seen a few plugs with very poor crimps to retain the porcelain and even a couple that were not crimped at all!
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Monday, October 13th, 2008 AT 5:50 PM
Tiny
BLACKOP555
  • MECHANIC
  • 10,371 POSTS
Very possible as swilliams says.

Basically just check to see if the porcelain is still in the plugs, if theres no porcelain at all probably a poor crimp.
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Monday, October 13th, 2008 AT 6:07 PM

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