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Old 02-06-2007, 03:37 AM   #1
KestrelSi
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07 WRB WRX

Default Recurring misfire CEL...take two

Didn't get much help out of the N/A forum, so I thought I'd throw it here and see what happens.

My friend's 02 Outback Limited with the 2.5L at about 87K miles, totally stock, has a recurring Cylinder 4 misfire. Only cylinder 4. It comes on about once every two weeks, where we then go and try something and clear the code with the OBD reader. My friend typically sees it when he pulls out of his apartment lot in the morning as he goes to work (and it wasn't there the night before). There is no hesitation or any indication that a misfire occured.

We've changed the plugs, the plug wires, the air filter, increasing fuel octane, and checked the coil pack. The car is pulling ~ 20 inHg of vacuum, so I don't think there's a vacuum leak. There was no listing for a PCV valve at Kragen, so I guess there isn't one. I told him to try a fuel injector cleaner next, but I don't exactly have high hopes of that working. Any ideas?

Thanks.
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Old 02-08-2007, 03:02 AM   #2
KestrelSi
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Anybody?
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Old 02-08-2007, 04:00 AM   #3
ilnmcom
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This is a long shot, but it happened to me in another car. On a six cylinder car, I was getting inconsistent misfires on cylinders 1, 2, 3 and 6. Totally random. Took it to the dealer, and found out that part of the catalytic converter had broken up and gone back into the exhaust preventing air flow.

I don't totally understand what caused it all, but they swapped the exhaust pipes and voila! Its worked fine ever since.

Again, a long shot, but since you've tried so many other things, what the hell?
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Old 02-08-2007, 01:56 PM   #4
rick-l
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Here is a test I did (on a non Subaru) that had interesting results.

If you can get a hold of radiator tester, pressurize the coolant system and leave it pressurized for an hour or so. Take out the plugs and crank the engine holding a white paper towel above the spark plug hole for cylinder #4.

See if there are green specs on the towel.
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Old 02-08-2007, 02:37 PM   #5
Bullitzx2
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hmm my friend had this problem on his v8 swap he did into is model A. he had a valve sticking open and close, it would work but everynow and then it would stick open or closed then he bent it. im not sure if that would be relevent to this situation.
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Old 02-18-2007, 01:05 AM   #6
AVATAR-X
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Similar thing happened on my brother's '02 WRX. Cylinder 3 would misfire every 5-6 months or so. It was always when the car was cold, while slowing to (or sitting at) a stop. We didn't notice any other symptoms, then one day the car lost an exhaust valve on cylinder 3.
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Old 03-13-2007, 09:04 AM   #7
pbpancho
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I am having the same issue right now. Recurring misfire on cylinder 3, even after I replaced the plugs, wires, and ignition coil.
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Old 03-13-2007, 11:25 AM   #8
North Ursalia
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Try a top engine cleaner (Subaru, seafoam, etc.) or replacing the knock sensor


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