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Old 03-31-2008, 08:06 PM   #1
Scooby Newbie
Member#: 159337
Join Date: Sep 2007
Chapter/Region: Tri-State
02 wrx /2.5 swap

Default Spark plug issue

What problems or damage would be caused if any from a spark plug with a crack in the insulator ?
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Old 04-01-2008, 11:06 AM   #2
Scooby Specialist
Member#: 41070
Join Date: Aug 2003
Location: Arizona
2005 Black Tiger
(Black Turbo Baja)


It won't fire correctly/reliably. That leads to poor mpg, high emissions, and more fuel in the oil, which puts big wear on the bearings, rings, and cylinders.
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Old 05-20-2009, 01:53 PM   #3
Scooby Specialist
Member#: 116052
Join Date: May 2006
Chapter/Region: MWSOC
Location: IL 수바루!
2011 STI ( Sold )


hmmm I did spark plug change for my 60k miles 06 wrx.

I had one plug had a crack on insulator. it was front passenger side one.
I am wondering what caused this.
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