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Old 12-29-2012, 05:33 AM   #1
superbj
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2005 STi

Default P0302 (cyl#2 misfire) after being low on gas? Help!

Long story short, I was driving to gas station with gas light on and while driving car started feeling rough and after filling up with 91 Shell the check engine and flashing cruise came on. Weather was about -25C/-13F.

Thought it'd go away after a while, but after 10miles and a ECU reset. It came back after driving a while with a rough and mildly shaky idle, but car runs/sounds fine after 1.5K RPM. Sometimes it would need a few cranks to start, as opposed to it starting fine before this happened even during the cold weather. It does however have raw fuel smell coming through vents and some fuel smell coming from driver side fuel rails only during very cold starts in this cold weather, but this has happened for a while and never caused misfire and don't know if it is now.

Used OBD2 reader and found the infamous P0302 with "fuel sys. 2 - cl-fault". Did a easy steps to try and troubleshoot:
- added seafoam in fuel tank
- swapped coilpacks around
- installed new plugs

Thought changing the plugs worked since the car felt closer to how it was before CEL, but after another cold start it came back. I

I know I should:
- swap around injectors (used screwdriver for sound check and it seemed ok?)
- compression/leakdown test (scary..)
- check wiring harnesses

Any other suggestions? Car is 2005 STi 98k bone stock, with the exception of Borla Hush catback exhuast. Thanks for reading!
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Last edited by superbj; 12-29-2012 at 05:37 AM. Reason: Forgot to mention something
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Old 12-29-2012, 05:54 AM   #2
jaxscuby
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the piston could be done..ringland failure
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Old 12-29-2012, 06:13 AM   #3
Uncle Scotty
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with the engine running....take the oil filler cap off

does it blow exhaust smoke out the filler tube??

yes = stick a fork in it...its done
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Old 12-29-2012, 07:11 AM   #4
Type2
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Sounds exactly like mine did when the ringlands went out. Sorry
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Old 12-29-2012, 08:48 AM   #5
superbj
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I don't see smoke black or white coming out of filler tube at cold startup to warm idle. Now that I've actually smelled my exhaust. It does seem a little rich. Forgot to mention this car was originally from California and sent up north to Canada.
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Old 12-29-2012, 08:52 PM   #6
Uncle Scotty
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might be a clogged/bad injector due to crap being sucked outta the tank

replace the fuel filter too
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Old 01-07-2013, 05:40 PM   #7
superbj
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UPDATE: Got it diagnosed at dealer, compression test shows the cylinder having super low compression at around 45psi and wet plugs. The recommendation was a whole new short block and possibly heads, going to cost more than 5k. They haven't done a leak down, so any possibility it could be bad valves or gaskets? Trying to be sure before I lay down a couple Gs on a rebuild.
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Old 01-08-2013, 02:31 AM   #8
superbj
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Forgot to mention, that the other cylinders was not tested and a leak down was not performed as well.
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Old 01-08-2013, 03:50 AM   #9
Uncle Scotty
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a bad valve would be a lot cheaper that a whole motor rebuild

dont let them screw ya
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