Thread: Knock at idle?
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Old 09-23-2009, 02:55 PM   #1
Scooby Newbie
Member#: 213473
Join Date: Jun 2009
Chapter/Region: MAIC
Location: York, PA
2004 WRX Wagon 19t
San Remo Red

Default Knock at idle?

Hello all,

I've been noticing that sitting at idle, knock sensor 1 records a decent amount of knock. I would estimate one knock every 10-15 seconds. So a couple questions. Which side of the motor is knock sensor 1 on? From the research I've done it seems like passenger side. The big question is what is causing this, and how should I fix it?

I've heard mention here and there that the suby boxer is noisy, and that sometimes the knock sensors read false knock, but I'd really rather not blow my engine apart. Also, my UEGO reads good AFRs at idle, with a tendancy to swing rich rather than lean. I've cleaned the MAF and reset ECU as well, still shows up.

USDM 04 WRX Wagon - 67k miles - XPT Stage 2 w/catless TBE
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