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Old 10-12-2013, 03:59 PM   #1
Scooby Specialist
Member#: 150611
Join Date: Jun 2007
Location: Gardner, MA
Default Really Frustrated! Wandering RPM's 07 Impreza 2.5i P0301 Misfire Idle Bouncing WTF!!!

So about two months ago I started my car and drove it for about 1/4 mile when it started bucking and cutting out. The check engine light started flashing and then came on solid. Every time I would come to a stop the car would act like it was going to die. I was able to drive it to the dealership in limp mode (cruise control light on and CEL light on). The dealership said it was code P0301 misfire cylinder one. They said they couldn't tell me exactly what it was but changed the spark plugs. The check engine light did not come back on since then, however the idle acts strange. When I turn the car on in the morning it will start around 1500 rpm and then drop to about 500rpm. It will occasionally bounce up to 1000 to 12/1500 rpm and then drop back down. It doesn't wander too bad on highway driving but when I let off the gas it seems to sometimes do it's own thing a little bit...I guess that's the best way to put it. I've cleaned the MAF sensor. I haven't changed the plug wires or coil pack...the car has 72k miles. From what i'm reading these misfire codes are a nightmare...any suggestions? I've ready anything from an exhaust leak to a bad injector, to cleaning the throttle body, to changing the coil packs and wires, to re-gapping spark plugs...I don't know where to freakin start...and i'm not extremely automotive savvy. I don't trust the dealership after they told me they didn't know what it was and basically will start replacing parts randomly at my expense.
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Old 10-12-2013, 04:15 PM   #2
Scooby Specialist
Member#: 354284
Join Date: Apr 2013
Location: Midwest
2013 Imp Sport CVT


I've seen same thing with intake gasket and o2 sensors. Not on subaru's but other makes. On my hemi, I removed both rear (downstream) o2 sensors, installed spark plug nonfoulers ( 2 per side with 2nd one drilled to allow o2 sensor to screw into it and put steel wool between them to block gases some coming to those 2 sensors. If the downstream sensors read differently than the upstream sensors you should be good.
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Old 10-12-2013, 05:01 PM   #3
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Member#: 324423
Join Date: Jun 2012
Location: CT
2012 Impreza Sport


I had similar issues with my sentra spec v. It turned out to be camshaft and crank shaft position sensors. Could be a number of things though
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