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Old 01-20-2013, 11:43 PM   #1
myslowgrandmacar
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Member#: 316137
Join Date: Apr 2012
Chapter/Region: Tri-State
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2008 Impreza 2.5i
Pearl Blue

Default 08 2.5i Misfire Cylinders 2 and 4

Hello fellow Subaru owners

Let me start off by saying that I am having issues with my 2008 Impreza 2.5i manual hatch with 75k miles.

My issue started up about a month ago. One night it was cold out and I started it up and I couldn't let it warm up as much as I usually do. I had went to drive it and noticed when I put the clutch in coming to stops it would stall. This would happen for 3 or 4 stops and then the issue stopped happening, but my idle would dip down to almost stopping.

The next day I threw a code for Cylinder 4 Misfire, and a pd code for Cylinder 4 misfire. I cleared the code to see if it would pop up again, and it didn't but I eventually had the stall after putting clutch in issue that resolved itself after a few stops again. CEL did not show for a while. The code reappeared a few days later without experiencing the clutch in stall issue. I changed the spark plugs, and noticed there was oil in the wire boots. I cleared the code and waited for it to pop up, and the CEL did not come on but I had a pending code for cylinder 4 misfire still.

My next step would be to change the wires out but I can't really troubleshoot because the miss isn't consistent. The issue seems to happen more frequently from a "cold" start, after letting it sit overnight etc. I can feel the car miss occasionally from a cold start but it doesn't do it while I'm driving and my mpg is around 26 doing highway driving at around 70-75 and when I'm cruising on backroads it's not uncommon for me to reach over 30mpg.

The car has around 75k miles on it. I bought it with 60k and have changed the oil twice since I've had the car with full synthetic mobil 1. The first time I changed it I believe I put 5w-30 in and the second time I changed it I put 0w-20 in. Besides this point, it seems like I lose a quart of oil every 1k miles and I do not have any oil leaks. I had this issue with both oil weights I put in.

Now tonight I go to drive it and it throws the code again for the first time in about a week and now I have a misfire in cylinder 2 and 4.

I will be updating post as I troubleshoot. Please help me with the direction I should take after I do the wires incase this isn't the issue. Thanks for taking the time to help me and hopefully the issue isn't serious.

EDIT:

I forgot to mention that when I pulled the plugs out they looked like perfect spark plugs, no deposits, they weren't oily etc.
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Old 01-20-2013, 11:55 PM   #2
mod maniac
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Join Date: Nov 2011
Chapter/Region: SCIC
Location: mariposa ca.
Vehicle:
2&4 fxt & fxt sti
Fullers Garage

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The oil on the plug wires is from a leaking valve cover gasket. The oil in the spark plug hole is probably causing your misfire. I would fix the valve cover gasket and clean out the plug holes. then see what happens
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Old 01-20-2013, 11:59 PM   #3
myslowgrandmacar
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Join Date: Apr 2012
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2008 Impreza 2.5i
Pearl Blue

Default

Ok, that will be my next step. Is the valve cover gasket leaking a common issue?
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Old 01-21-2013, 12:24 AM   #4
mod maniac
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^^^ yes it is.
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Old 01-21-2013, 11:48 PM   #5
Dr. Octawakaoctapus
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teal

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Its a VERY common issuer unfortunately. When I reseal the V/C's I use syl-glyde on the Tube Seals in hopes to better their longevity.
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Old 07-09-2013, 08:25 PM   #6
DPDISXR4Ti
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1985 XRBrati

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I just had this issue with a 2007 Forester, 77K. It was throwing a P0301 and 303 error, so #1 and #3 were mis-firing. I decided to replace the coil-pack, wires, and plugs and indeed the errors are gone and the engine runs much smoother.

I too have VC leaks at the tube seals, but I don't think that's the problem here since the leaking oil level isn't up as far as the contact point.
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