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Old 12-27-2004, 07:32 PM   #1
Brupp
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Default Cylinder 3 and 4 Misfire

I have had my outback for about a year now and have had struggles with cylinders misfiring for the entirety of that time. Usually it is just one cylinder though, and it seems to happen rarely as when I had the code checked it is a freeze code. I have already replaced both plugs and wires. Recently though I was driving the check engine light came on and when the codes were checked it said cylinder 3 and 4 misfire. The car still runs fine, as a matter of fact I drove it from Oregon to Colorado with no problems. If anyone has any suggestions on what I should do next that would be great. Thanks so much.
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Old 12-27-2004, 07:39 PM   #2
m750
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if it were me, I'd 'read' the plugs. Basically pull them, and see if they are white or black, being too hot (lean), or too rich. Have you tried using a higher grade gas? What condition is your coil pack? are the terminals tarnished? You may want to visit a dealer.
AO
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Old 12-29-2004, 12:30 PM   #3
Brupp
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Thanks so much, I will try to check all of those things out.
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Old 12-30-2004, 12:41 AM   #4
Charlie-III
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What plugs and wires did you use?

Are they the same type that was on there before?

I ask since Bosch Platinum plugs and wires have ALWAYS been an issue for me in Subies.
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Old 12-30-2004, 02:57 PM   #5
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Do you know if you have a lightened fly wheel or crank pulley? I know that those types of mods can cause the computer to think that there is a misfire, but there really isn't. Use to have this problem in my 2.5 (I had both of those mods).
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Old 01-03-2005, 07:15 PM   #6
Brupp
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The plugs I used were Platinum, however I can't remember the exact brand, and I didn't check if they were the same as before, I just went with whatever the guy at checkers recommended. I used Napa's premium spark plug wires. I don't have a lightened crank pulley or fly wheel. I did notice that when I hit a bump on the interstate, two different times on the same bump the check engine light flashed. I don't know if that could be a possibility of something being loose? Thanks so much for your help.
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Old 01-04-2005, 12:55 AM   #7
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Quote:
Originally Posted by Brupp
I have had my outback for about a year now and have had struggles with cylinders misfiring for the entirety of that time.
My 2.5l would occasionally get misfire codes on one or both of 3&4. It seemed to occur on accelleration when not fully warmed up. The dealer fixed it (for free) by adjusting the valves.
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Old 01-04-2005, 01:27 AM   #8
00Maddog
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Quote:
Originally Posted by davidji
My 2.5l would occasionally get misfire codes on one or both of 3&4. It seemed to occur on accelleration when not fully warmed up. The dealer fixed it (for free) by adjusting the valves.
yes the new 2.5's say adjust valves at 105k, but I have seen cars as low as 35k with valves so tight that they misfire on cold startups. sometimes on several cylinders. This has plagued many mechanics that don't know the valvetrain is adjustable. BTW a bump in the road would not set this problem off.

One more thing, cyl 3+4 share the same ignition coil, so the coil could be the cause too. I have seen many autostarts wired into that coil, if the autostart wire splice has caused a problem that could cause this too.
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Old 01-04-2005, 09:07 AM   #9
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I went through a hellish ordeal for a year myself, trying to get a P0304 figured out. I replaced the wires and ignition coil in the process, neither of which were the culprit. Long story short, have someone check your fuel injectors in those cylinders. I had my #4 replaced a month or so ago, and the CEL's been off ever since. (Knock on wood.)
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Old 01-04-2005, 01:32 PM   #10
Brupp
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I will check into all those things thanks so much for your guys' help, and recommendations. Is it pretty hard to replace a coil?
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Old 01-04-2005, 03:23 PM   #11
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Quote:
Originally Posted by 00Maddog
yes the new 2.5's say adjust valves at 105k, but I have seen cars as low as 35k with valves so tight that they misfire on cold startups. sometimes on several cylinders.
Mine was probably around 15k miles. Don't remember exactly, but clutch was at 19k (TSB), and this was before that. If the dealership wasn't treating me well, I doubt I'd be a happy Subaru customer, since I've had to see too much of them...
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Old 01-15-2005, 02:34 PM   #12
Brupp
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My outback is at 127k. I have noticed that the check engine light usually flashes when I am at high rpms and going downhill. Usually I have the cruise on and however my car does not lose any speed, but I would think if two cylinders were misfiring then I would not be able to maintain 75 to 80 mph. I don't know if that helps anything, but thanks so much for your guys' help.
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Old 01-15-2005, 03:15 PM   #13
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i had a cold start up misfire on 3 and 4 as well, i think i'll take it by a dealer
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Old 01-15-2005, 03:37 PM   #14
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Quote:
Originally Posted by IMPRZV1
Do you know if you have a lightened fly wheel or crank pulley? I know that those types of mods can cause the computer to think that there is a misfire, but there really isn't. Use to have this problem in my 2.5 (I had both of those mods).
really? hmmm....
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Old 01-25-2005, 05:56 PM   #15
Brupp
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Yesterday I took my car in to have the oil changed and they reset the CEL, and told me that everything on the car looked fine. So far I haven't had any problems and it appears to be running great. Thanks so much for your guys' help.
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Old 02-08-2005, 10:36 AM   #16
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Brupp, your legacy is a 98 correct w/ a DOHC if so did you have the headgasket done ? if so who did the work and at what mile range was it serviced.. i kno this would seem unrealated to most people but his answers can set a few ideas to mind for me..
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Old 02-08-2005, 08:13 PM   #17
Brupp
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Yes my subaru is a 98 outback, but I have not had any headgasket work done to my car, however I have only had it for a year and it had 100k miles on it when I bought it. Ever since I had oil changed though the CEL has been off and hasn't come back on. the car has always appeared to be running fine, and I assume that everything is ok now, but don't know what triggered the CEL for so long. Thanks so much for your help.
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Old 02-10-2005, 12:38 AM   #18
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alright good luck, im guessing that the previous owner had the head gasket done around 60-70k range like most of the other DOHC owners have been forced into
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Old 02-10-2005, 12:04 PM   #19
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Call chuck thompson at Bob dunn subaru (also where I work) But he said to call him, Both of us know what the problem is with your missfire. My cell is 919 697 6748. My name is mike.
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Old 02-10-2005, 12:16 PM   #20
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i had replaced my plugs with bosch plats which were recommended to me by some monkey-brained dolt at autozone... plat's are too hot of a spark and will not last long in rich-running subaru motors.
when i got a misfire about 4k miles later, i put in denso standards(colder spark, should be better for the EJ25) and made sure they were gapped properly, and it's been fine since. make sure to go with the spark plugs that are recommended in the owner's manual.
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Old 02-10-2005, 12:18 PM   #21
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P0304 here too, cylinder 4 misfire. It took two visits; they found that it was a tight exhaust valve, adjusted it, and charged me $148 instead of $350.

I'm just happy its off.
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Old 02-10-2005, 01:43 PM   #22
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Could it be the wires that are in there? I seem to remember a number of folks having all kinds of trouble with many non-OEM plug wires.
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Old 02-11-2005, 11:47 AM   #23
Seeinstars
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bump
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Old 02-05-2006, 03:56 PM   #24
Brupp
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Default coil question?

I must ask a question, due to the fact that I am a moron and know little about cars. Is the coil I should buy to replace the coil pack connecting cylinders three and four on my outback the ignition coil? Thanks so much for your help.

Bryan
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Old 02-10-2006, 07:57 PM   #25
Patrick Olsen
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Yup, the ignition coil is the coil pack sitting on top of the intake manifold with the 4 plug wires coming out of it. I replied in your other thread about how to replace it - it really is very easy. I actually just replaced mine last night, in the dark, in 35deg weather, and it took about 3min (and not just because it was 35deg out! ). A new one will cost you about $100 I think.

Quote:
Originally Posted by Handsdown
i had replaced my plugs with bosch plats which were recommended to me by some monkey-brained dolt at autozone... plat's are too hot of a spark and will not last long in rich-running subaru motors.
A platinum plug spec'd for your engine shouldn't run any hotter than a conventional plug spec'd for your engine. And to say that platinums are "too hot" for a Subaru engine is rather silly, seeing as the only plug that Subaru specs for the EJ25D DOHC engine in Brupp's Outback (and my 2.5GT) is a platinum plug (specifically, an NGK platinum). My owner's manual lists 3 or 4 suitable plugs for the 2.2L cars, but has just one listing for the 2.5L engine.

Pat Olsen
'97 Legacy 2.5GT sedan
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