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Old 09-25-2003, 08:39 PM   #1
Scooby Newbie
Member#: 31070
Join Date: Dec 2002
Location: aurora colorado
2002 WRX Sedan
W.R. Blue

Question Knock with cold start

I have a knock that starts with a cold start and fades usually after the car warms up. However, the knock continued today well after the car warmed up. Then, poof it was gone. Any ideas??
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jetsiphon is offline   Reply With Quote
Old 09-25-2003, 10:33 PM   #2
Scooby Newbie
Member#: 17863
Join Date: Apr 2002
Location: PEI, Canada
2002 Impreza WRX


If it sounds like a dull knock it's most likely piston slap. Pretty common on subarus. The turbo EJ20 has pretty short piston skirts and the pistons sit on their sides so they are more succeptable to 'slap'. If it goes away when it's warm it's not too serious. If you make a point of complaining to your dealer or subaru rep they may give you a new short block if your car's under warranty. I've been told that it's harmless but I personally think any mechanical knock sound is not good.
carpetsloth is offline   Reply With Quote
Old 09-26-2003, 12:09 AM   #3
Scooby Newbie
Member#: 15073
Join Date: Feb 2002
Location: Canyon Country
2002 WRX Sedan
Lotus Seven, A-H 3000


try a search "cam belt tensioner". quite a few cars have had defective ones and been replaced under warranty.
sevenhead is offline   Reply With Quote
Old 09-26-2003, 12:53 AM   #4
Scooby Guru
Member#: 4835
Join Date: Mar 2001
Chapter/Region: Tri-State
Location: Fl33tw00d, PA
2003 Baja 5MT
Yellow w/ 220,000 miles


most likely the sound of solid valve lifters when they are cold.
Samirr76 is offline   Reply With Quote

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