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2001 Legacy L Sedan, 2009 Impreza Sedan, 2013 Crosstrek, 2016 WRX
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Discussion Starter #1
I have a 2005 Forester XS (non-turbo) with cylinder 1 & 2 misfiring. I cleared the codes and those were the only two cylinders that came back. The misfiring starts less then a minute into the car starting cold so it's happening in Open Loop as well as Closed Loop. If I give the car some gas things seem to improve as the misfiring is most noticeable during idle.

I have already replaced plugs and there was no difference. I checked wires for continuity and they seemed fine even when moving them around some. The car is due for a timing belt but if something skipped a tooth I would think the misfiring would be happening to all cylinders or at least the cylinders on the same side of the engine but perhaps I am wrong. I'd like to solve this before I spend money on a timing job anyways.

There is an exhaust leak by the muffler but it's far down post catalytic converter. If the leak as well as if a bad sensor was causing the issue I would expect all cylinders to run bad not just the front two but again maybe I am wrong.

With Cylinder 1 & 2 sharing a coil replacing that seemed to make the most sense to me. Any thoughts before I go out any buy a replacement? Thanks in advance!
 

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2001 Legacy L Sedan, 2009 Impreza Sedan, 2013 Crosstrek, 2016 WRX
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149 Posts
Discussion Starter #3
I think your logic is good, I'd look at the coil next too. Used ones can save you a lot vs. new.
Thanks, I'll price one out tomorrow unless someone has another suggestion
 

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03 H6 OBW & 06 WRX Sportwagon
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17,619 Posts
no correlation with moist/wet conditions?

no oil on plug boots?
 

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2001 Legacy L Sedan, 2009 Impreza Sedan, 2013 Crosstrek, 2016 WRX
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149 Posts
Discussion Starter #5
no correlation with moist/wet conditions?

no oil on plug boots?
I cleaned all oil off and it's not pouring back in there but yes the spark tube gaskets need doing soon. And no it runs like this immediately after starting in all conditions.
 

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On the Super Mod Squad
2002 Pair: 3.0 VDC Wag & 2.5 Limited Sedan
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26,194 Posts
Thanks, I'll price one out tomorrow unless someone has another suggestion
only look for new or used subaru coils. if you are out to try something different then what you have.

aftermarkets just plain suck. might work for a month and then cause more misfires.

miles on the car. ? OEM coils can last 200,000 miles.
________

how old are the plugs and wires.? and what are they.

the OEM copper NGK plugs only last 30,000 miles....you can buy double plats for this car for less then $20 as they are so small.

subaru likes NGK. (cheap on amazon/ rockauto).
 

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257 Posts
I have had the exact opposite experience with Subaru coils. I have seen plenty fail and I have replaced them with quality aftermarket coils without a problem. They usually have some signs of tracking around the spark plug connections. You generally have to look close to see the tracking.

I have also seen leakage from the wires at times.
 

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On the Super Mod Squad
2002 Pair: 3.0 VDC Wag & 2.5 Limited Sedan
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26,194 Posts
I have had the exact opposite experience with Subaru coils. I have seen plenty fail and I have replaced them with quality aftermarket coils without a problem. They usually have some signs of tracking around the spark plug connections. You generally have to look close to see the tracking.

I have also seen leakage from the wires at times.
which aftermarket coils ave you tried and had good luck with on plain H4 subarus of 1995-2009?

I noticed NGK (=NTK) started to market one recently, but sadly the asking price is higher then a new OEM.
 

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I have used NAPA Echlin and Delphi coils. I have never had a problem using any good quality 7mm spark plug wire sets either.
 
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