Help needed: Misfire Cylinder 3 - Subaru WRX Forum
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post #1 of 4 Old 04-07-2012, 03:48 PM Thread Starter
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Help needed: Misfire Cylinder 3

I have a 2003 Subaru WRX and it's been having some issues with 4th gear and 5th gear. At first I thought was the clutch slipping because the car would loose power at those gears. I took it to track yesterday and finally the check engine light came on and when I plugged in the OBD II it read "Misfire - Cylinder 3" any idea what could cause it?

The car would start up now, but after tracking it I think it gotten worst b/c now the car would start up rough but I can still drive it around.
The car has 130K miles on it and I'm worried if I don't get this fixed, it could lead to other mechanical problems. Any help would be appreciated.

Could it be spark plug? What should i try first?
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post #2 of 4 Old 04-07-2012, 06:49 PM
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When was the last maintainance done and what was done to the car? What modifications do you have done to the car?

"2007 WRX- PPG'd, 20G- Tim Bailey tuned
Stage 2 2005 WRX"
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post #3 of 4 Old 04-07-2012, 07:53 PM
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Spark plugs are kinda fun to do. Try a new fuel filter first. Cheap and very easy to change. I was having the same issue and that fixed me up. I also changed the plugs but it didn't work for me.

Cobb ap stage 2 ots, catless uppipe, catless turboback, Cobb Sf intake.
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post #4 of 4 Old 04-07-2012, 08:45 PM
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Do a SeaFoam treatment to see if it'll clear it up.

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