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Old 03-07-2011, 11:26 PM   #1
krismo
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Default misfire cylinder 2 and 3 !!! Anyone seen this before?

Still dealing with rough idle and stalling at stop signs.
It's not coil pack or spark plugs.
Why misfire on Cyl. 2 and 3? Can this tell something?
It's a 2005rs with 80k on it.
H e l p p l e a s e !!!
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Old 03-08-2011, 03:02 PM   #2
Samirr76
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Then its probably head gaskets. Check your coolant, see if its low and see if theres any air bubbles in it.
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Old 03-08-2011, 04:14 PM   #3
GrundleJuice
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Quote:
Originally Posted by Samirr76
Then its probably head gaskets. Check your coolant, see if its low and see if theres any air bubbles in it.
How did you come to this conclusion? There are so many other things that are easy to chk and easy/cheap to fix. Besides a bad headset usually has other symptoms. stalling and rough idle are not typical symptoms of a bad head gasket.

OP - any recent maintenance or out of the ordinary events like driving through deep water? Any mods? misfire can be caused by so many things that its not enough by itself to narrow much down. Plugs, wires, coilpacks are god to chk on the spark side of things. How have you ruled out the plus and coils? Inspect the Intake system for damage or loose couplings, the MAF sensor for security and the wiring harness for damage/security. Fueling could be the culprit too. How many miles on the front O2 sensor? Exhaust leak pre O2 sensor?
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Old 03-08-2011, 05:22 PM   #4
yarrgh
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Something else that's free to check/fix is to see if the cam timing is off.
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Old 03-08-2011, 05:54 PM   #5
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^if the cam timing was off wouldn't it be a miss fire for both cylinders on one side not just one cylinder on each side? Cyl 2 and 3 are on opposite sides. You can check valve lash though it's not likely. Maybe clogged injectors, ICV or exhaust leak. You should get the codes pulled with Freeze frame so you can see when the misfire is happeneing. there are too many things that cause a misfire.

Last edited by aclver1; 03-08-2011 at 06:01 PM.
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Old 03-08-2011, 07:42 PM   #6
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Plug wires?
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Old 03-08-2011, 09:17 PM   #7
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Quote:
Originally Posted by Samirr76 View Post
Then its probably head gaskets. Check your coolant, see if its low and see if theres any air bubbles in it.
Where did you get this conclusion? I have seen a ton of Subaru's with leaking, and blown headgaskets and not have a misfire.


OP- How did you rule out the coil? How about the wires? Have you tried swapping them to see if the misfire changes cylinders?
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Old 03-08-2011, 11:08 PM   #8
krismo
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Quote:
Originally Posted by blackfang View Post
Where did you get this conclusion? I have seen a ton of Subaru's with leaking, and blown headgaskets and not have a misfire.


OP- How did you rule out the coil? How about the wires? Have you tried swapping them to see if the misfire changes cylinders?
I thought it was my plugs so I changed them to brand new OEM plugs.
Then I though it was my coil pack - I swapped it with someone with no help. I also changed PCV valve, battery and I had my alternator checked.
I can data log but I don't know what to look for. Somone had a lookie, and they said that there is something wierd with my rear O2 sensor.
Could that couse rough idle/misfire?
Thanks for all your help!
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Old 03-08-2011, 11:19 PM   #9
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I can't see a rear oxygen sensor causing it, but a bad front one can cause the ECM to add more fuel or cause it not to add enough. What have you done about wires? have you swapped them? Check for arcing?
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Old 03-08-2011, 11:39 PM   #10
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Quote:
Originally Posted by blackfang View Post
I can't see a rear oxygen sensor causing it, but a bad front one can cause the ECM to add more fuel or cause it not to add enough. What have you done about wires? have you swapped them? Check for arcing?
Still original wires. I did check the resistance though, sprayed it with water, and had a look when it was dark.
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Old 03-08-2011, 11:40 PM   #11
blackfang
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Hmmm... Spark plugs are gapped correctly?
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Old 03-08-2011, 11:44 PM   #12
krismo
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Quote:
Originally Posted by blackfang View Post
I can't see a rear oxygen sensor causing it, but a bad front one can cause the ECM to add more fuel or cause it not to add enough. What have you done about wires? have you swapped them? Check for arcing?
Yeah, I thought that front O2 sensor could be at fault, but I guess they work as a pair, so rear sensor can fool the front one...?
I don't know if it makes sense, but that's how i understand it.
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Old 03-09-2011, 12:24 AM   #13
GrundleJuice
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If you can data log chk you're long term fuel trims to see if its a fueling issue that would point to an O2 sensor.
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Old 03-09-2011, 09:23 AM   #14
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OK, if your plug wires have 80k miles on them, change them. Even if they work fine right now, they're very near the end of their life cycle.

The rear O2 sensor on a 2005 RS can make very minor adjustments to your fuel trims, +/- 5% IIRC. That's all your ECU will allow it to make. It's only there to compensate for a degrading cat efficiency. Even if it was maxing the fuel trims to 5%, that shouldn't be enough to cause a misfire, and it sholdnt be causing a misfire on only 2 cylinders.

My bet is plug wires or injectors.
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