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Old 09-27-2011, 07:12 PM   #1
mjyeams
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Member#: 111236
Join Date: Mar 2006
Chapter/Region: MAIC
Location: Baltimore, MD
Vehicle:
2010 WRX Hatch
OBP

Default Rod knock on cold start?

So on Monday of last week, I left for the beach, but took my girlfriends car for the trip. My 2010 WRX sat parked on the street for 5 days and when I got home just this past Saturday I started it up to make a trip to the grocery store. Upon starting the car, I got a horrible knocking sound from the engine that quickly tapered off after a few seconds as it settled into a normal warm up idle.

I spun a rod bearing in my old 2000 Impreza RS and the sound my WRX made when I started it sounded exactly like the RS engine after the rod bearing spun. However, after that initial start up the WRX has sounded fine and been running perfectly fine. Has this happened to anyone else? I'd really appreciate some input as to what you all might think have caused the engine to do that and maybe some things I should do to troubleshoot? I have a couple friends with 2009, 2010, and 2011 WRX's and all of them have left their car's sit for over a week without starting at one point or another and never had anything like this happen....

Thanks!
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Old 09-27-2011, 08:16 PM   #2
kuntryquest
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2005 Legacy GT
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Synthic oils are actually so slippery that it will "slide " down and away from things. The hotter the weather the worse it is.
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Old 09-27-2011, 08:26 PM   #3
nhat
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03 STi
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Quote:
Originally Posted by kuntryquest
Synthic oils are actually so slippery that it will "slide " down and away from things. The hotter the weather the worse it is.
i don't even know where to start...
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Old 09-28-2011, 12:55 AM   #4
atomicfire
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Join Date: Dec 2006
Chapter/Region: TXIC
Location: Midtown, Houston, TX
Vehicle:
2005 STi
OBP

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This is a pretty well documented issue - a lot of Subaru people report minor knock on cold starts after the car as been sitting for a while and in very cold weather. It did it to me on my 05 STi once in NJ on a cold winter morning at 0F and happened to my gf's 08 STi in Colorado on a -20F morning. The important thing is that the knocking goes away quickly. If it lingers for more than a few seconds then you have a problem. If it goes away quickly, you're fine. Don't worry about it; if it does bother you take it to the dealer and have them look it over and document it in case it does turn into trouble.
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Old 09-28-2011, 08:10 AM   #5
KillerBMotorsport
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Join Date: Dec 2008
Chapter/Region: MAIC
Location: Virginia
Vehicle:
2005 WRX/STi
WRB of course

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I've not heard of anything like this except in very cold weather. What oil viscosity are you using?

It might not be a bad idea to check a known issue on these cars, the OEM oil pickup (PICS HERE). A cracked oil pickup can cause delayed initial oiling (when cold), low pressure at idle and reduced pressure at cruise/load. It's a pain to check, but much easier than replacing an engine.
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