Rough idle, sometimes won't start - Subaru WRX Forum
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#1 Old 05-18-2012, 01:57 PM
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Rough idle, sometimes won't start

Just bought our 02 WRX, has a little over a 100k on it, the lady we bought the car from had the 100k maintanance done to it bought the guy that did it seems like a slacker from what I can see! We took it in to Subaru to have the lines replaced under warranty. Once we got it back the CEL came on and they said it was a misfire, cylinder 3. Since then I cleaned the MAF sensor and the light hasn't come back on. The car sometimes has a slight rough idle and rarely won't start, but it still cranks over. I was thinking over using a oil additive to clean the injectors (seemed to help with my diesel). Has anyone used any oil additives or fuel additives to fix an issue like this? MPG is a little weak from what I've heard from others as well. Car has no mods beside a K&N stock filter replacement. Thanks
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#2 Old 05-18-2012, 05:36 PM
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You may try and replace the fuel filter up front. I had very similar issues a few months ago and that fixed me right up. A wix filter from oreilys was like 20 bucks.

Cobb ap stage 2 ots, catless uppipe, catless turboback, Cobb Sf intake.
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#3 Old 05-18-2012, 10:07 PM
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With the 100k Maintanance it was supposed to be done, it looks new but I question the company that did the service. I'll probably end up trying a new fuel filter
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#4 Old 05-21-2012, 06:01 AM
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B12 or SeaFoam only in the fuel tank.

2002 WRX Sold
2007 WRX Sold
2007 STi totaled
2007 Foz XT sold
2007 MS3
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