Misfire #4 Cylinder - Subaru Outback - Subaru Outback Forums

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Old 01-18-2008, 07:08 PM   #1 (permalink)
Legionairre

 
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Default Misfire #4 Cylinder

Code P0304 (Misfire Cylinder 4) reading on my 2001 Outback with the check engine light on. I've got a 115K miles on it, the timing belt has never been replaced, plugs were recently changed (the light came on before the plug change). Could a bad plug wire be the culprit? What else should I look for? Thanks.
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Old 01-18-2008, 07:35 PM   #2 (permalink)
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REPLACE THAT TIMING BELT!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

You have an interference engine. The timing belt interval is 106,000 miles. If the belt brakes, It will take some valves with it, and maybe more. The piston will hit some valves. While your there you should so cam seals, main seal, and the waterpump. This will keep you good for another 106,000 miles.

Next you are also due for a tuneup, plugs and wires (wires need to be from Subaru).

After that if you still have a miss we can look at it.

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Old 01-18-2008, 08:14 PM   #3 (permalink)
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The TB replacement is on my list of things to do. Unfortunately, I do not have the money for a timing belt replacement, at this time, and because it's an interference engine, and an improperly installed belt could cause the valves to collide, I will not attempt that job myself. I'll replace the plug wires next. Short of a timing belt replacement is there something else I can do? Thanks.
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Old 01-18-2008, 08:38 PM   #4 (permalink)
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This is something you need to re consider. When a timing belt breaks, it can double or triple the cost of what would have been a timing belt job. You really are playing with fire here, a 700 dollar job vs a 1500 + job.

Replacing the timing belt yourself, the worst thing youll do is get it off by a tooth or two, and that wont cause damage.

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Old 01-18-2008, 08:50 PM   #5 (permalink)
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huh. before i bought my 01 ob i read it was not an interferance engine. where can one really find out??

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Old 01-18-2008, 08:56 PM   #6 (permalink)
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http://endwrench.com/images/pdfs/2.2SingleOverWin01.pdf
http://endwrench.com/images/pdfs/TBeltEWWin05.pdf
http://endwrench.com/images/pdfs/StepEWAug07.pdf
http://endwrench.com/images/pdfs/2.5Timing.pdf

right from the horses mouth


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Old 01-18-2008, 09:12 PM   #7 (permalink)
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Right on, the '01 Outback (if it doesn't have the H6 3.0L) has the phase II 2.5L sohc, with a 105,000 mile or 105 month timing belt replacement interval. It is a piston to valve interference engine. Soob 2.5L's have always been interference engines. ~96 and earlier soob 2.2L's and smaller engines were non-interference.

The engine also needs a valve lash/clearance check and adjustment at 105k miles. On that style lifter, the valve can recede into the seat faster than the lifter wears, thus over time resulting in valves that may not close completely (which can cause misfire, not to mention scorching valves $$$$).
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Old 01-19-2008, 01:12 PM   #8 (permalink)
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Does the valve adjustment involve actually replacing shims?
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Old 01-19-2008, 02:41 PM   #9 (permalink)
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The 2.2 is has threaded adjustment.
The 2.5 requires shim replacement if out of spec.
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Old 01-19-2008, 07:56 PM   #10 (permalink)
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I think '01 2.5L sohc phase II would have the screw and locknut adjusters. I think the shims were only on maybe 97-99 2.5L dohc phase I. My '00obw had the solid lifters with relatively easy to adjust screw and locknuts (no shims, no HLA hydraulic lash adjsuters). I think I needed a good flat head screwdriver and a 8mm 6pt wrench. There is good free procedure on www.endwrench.com

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