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Old 03-28-2005, 12:49 PM   #1
Scooby Newbie
Member#: 41323
Join Date: Aug 2003
Location: Granger IN
2002 WRX

Default spark plug problem

i have a wrx with a 2.5 sti short block with stock 2.0 heads and stock intake manfold. pretty much everything else is stock except for a perrin up pipe and a injen colder intake.

first the engine will start to sound like it is knocking pretty loud after about 10mins of driving. and then when i remove the suspected plug you are able to freely turn the porcelien (from tip to tip) inside of the metal part. i have driven the car with this setup for about 700 miles and this has happen twice in two different cylenders. The plugs that i am using are denso Iridiums

has anybody else had this problem or know how to fix this problem if so how did you fix? i am think colder plugs.
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