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Old 10-29-2006, 09:27 AM   #1
Scooby Newbie
Member#: 105923
Join Date: Jan 2006
Location: Cheyenne, WY
04 WRX

Default Occassional knock at idle?

I was doing some live tuning and noticed that at idle I was getting an occasional knock (720-730rpm). I didn't log it but was curious if anyone else has seen any knocking at idle. I don't get any knocking under load, only an occasional one at idle? Not sure if it is a true knock or if the sensor is picking up noise from belt tensioner or valve noise. Just wanted to know if this is common or not. 2004 WRX 28kmi Mods are 16g, Spearco TMIC, pnp exhaust manifold, helix uppipe, turbo xs stealth back exhaust, perrin pulley, walboro pump, and one step colder plugs.
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Old 10-29-2006, 09:29 AM   #2
Scooby Specialist
Member#: 64467
Join Date: Jun 2004
Chapter/Region: MWSOC
Location: NWS
2013 Forester XT
Sage GReen


ill bump this as i have seen the same with my logs. unknown cause.
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Old 10-29-2006, 09:43 AM   #3
Uncle Scotty
Scooby Guru
Member#: 16200
Join Date: Mar 2002
OK Houston
we have an Uncle


....and I have too....it really can not be true 'knock'....it has to be some sort of mechanical transient being 'heard' as knock.

I chased it all over hell and back and in the end.....fergetaboutit.

This has been posted before....
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Old 10-29-2006, 09:46 PM   #4
Scooby Specialist
Member#: 50699
Join Date: Dec 2003
Chapter/Region: TXIC
Location: austin
2004 WRX
Platinum Silver


Try raising the idle. Some have said this helps get read of the instance. However, the source of the instance has yet to be found.
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