I have a 2004 wrx wagon that is pretty much stock engine wise aside from being AP Stage 1 93 octane. I have just under 39k miles and all my service is up to date.
I've been stage 1 (eveything else stock) for just about a year with no problems whatsoever.
Today my wife drives to work and gets a blinking CEL. I know this usually means there's a misfire in one of the cylinders but on her drive home there was no more CEL blinking or otherwise.
She gets home and I try to pull the error code with my AP, but none show up. I start the car and the blinking CEL is back so I drive to autozone to see if they can pull the code. I get there, hook up to their OBDII reader and nothing. No code. I start her up and no more CEL. WTF?
For about a half hour I drove around, alternating between turning the engine off and then driving for a few minutes, then turning off again. No CEL to speak of. Car is running great.
At the end I reflashed my realtime map to stage 1 93 octane and called it a night.
Any thoughts on this?