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Old 03-02-2011, 12:34 PM   #1
BDZ
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Join Date: May 2010
Location: Central NY
Default Misfire code P0302

My '06 2.5i set a P0302 misfire code. I cleared the codes with a scan tool and its been code free for 200 miles but the car seems to be running rougher than normal at idle and during acceleration from a stop.

My plug wires and coil all check out within spec per the service manual but with 125k miles could they be worn out and still test okay?
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Old 03-02-2011, 04:49 PM   #2
yarrgh
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2001 2.5RS
Black Diamond Pearl

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The wires could be, don't know about the coil. Have you checked the plugs themselves? Do eet.
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Old 03-03-2011, 10:24 AM   #3
BDZ
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Plugs have less than 20k miles on them. Replaced at ~109k with Tbelt and waterpump.

Wires and coil pack ohmed out per service manual spec with no visible cracks or degraded insulation. I misted an alcohol/water mix under the hood to look for evidence of a bad wire but was unable to detect any arcing.
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Old 03-03-2011, 02:17 PM   #4
aclver1
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2004 Impreza 2.5rs
70 Datsun Fairlady

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a misfire is a hard thing to track down. I'm having the same misfire and I've been working on mine for a while. I would swap you plugs/ wires/ injectors and see if it follows the change. If not, find a place with a OBD II reader that can do freeze data and find out when the misfire is happening. It can be a number of other things like, bad cat or O2 sensor, timing, knock sensor, valve lash, or burnt valve but usually those will cause multiple codes. I have cams and a LW flywheel and crank pulley so i always thought that was my problem but it may have just been masking my actually misfire. After i did my 6-speed swap and put in a heavier flywheel all the misfires went a way but the p0302, so i may have had an actual misfire the whole time and didn't realize it.

Last edited by aclver1; 03-03-2011 at 02:33 PM.
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