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Old 07-18-2011, 03:31 PM   #1
Scooby Newbie
Member#: 49305
Join Date: Nov 2003
Chapter/Region: NWIC
Location: Seattle, WA
2002 Stg.2 WRX Wagon

Default 02 WRX boost oscillation

Just noticed this today on my car. Not sure how long it's been doing it, since I've not changed anything mechanical on the car for a long time (years) and don't usually stare at the boost gauge when driving. Been running S2/DP/UP for many years as well.

- '02 WRX ~60K miles
- Cobb DP
- Accessport (v1) stage 2 91oct (basemap)
- SAMCO IC hoses

It matches the symptoms in this thread pretty well - between 1.2 bar and 0.8 bar, ~1 hz oscillation.

Most obvious foot-on-floor in 4th or 5th at around 3k RPM.

Some similar discussion in this thread over in 2.0, but nobody seemed to figure out the cause.

Interestingly today on my short drive to work, didn't repro. Yesterday it was 100% repro in 4/5th during a long(er) freeway drive.

Any ideas?

( edit - only mechanical thing done in the last ~6mo was the cold-weather-smell TSB (which the dealer messed up by leaving the PCV hose disconnected) and an ABS ECU replacment )
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