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Old 04-09-2013, 12:20 PM   #11
The Phenx
Scooby Specialist
Member#: 95823
Join Date: Sep 2005
Chapter/Region: MAIC
2003 Imprezza Wrx


I know this was from a LONG time ago.. but I thought I would update in case someone searches.

The problem eventually revealed itself.

It was the exhuast valve in cyl #4. It needed adjustment. Wasn't sealing properly until the engine was fully warmed up and the metal expanded.

Hence why the codes only happened on warm up cycle.

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