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Old 06-14-2004, 03:20 PM   #1
DSMTurbo2
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Default PO304 Engine misfire #4, help please??

Hey all, im over here from DSMtalk.com yeah im a dsm guy, but i was doing some work on my sisters 96 Legacy wagon and was having some issues, ive been a member here for a while but have only really read around. i am a rally and of course then subie fan.. this seems like the place with the most knowledge when it comes to subies... so anyway enough sunshine... it has been getting a flashing CEL (misfire) after start up while the car is still warming up... it is usually humid and always colder out. i have only got hte car to do this a couple times.. if i start the car when it is warm out it runs just fine (no flashing).... i went to autozone pulled the code and it only has a PO304 (cylinder 4 misfire).... from my understanding when she first took the car in the number 4 plug wire looked horrible (was almost corroded all the way through) so obviously this was replaced.... im assuming this could have put a great deal of strain on the coil and belive that this will be the problem but i want to know all my options before i go out and replace it.... im going to do a comp test but i was also curious on what other test i can and should do??? is there a way i can test the coil pack on these cars??? any help would be greatly appreciated... thank you all. Erik.
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Old 06-14-2004, 05:46 PM   #2
reks
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I had a similar problem with my Impreza. I ended up getting a new distributor cap and wires under warranty. It looks like you've already solved the problem .

One polite suggestion: Paragraphs make the reading easier .
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Old 07-02-2004, 02:29 PM   #3
DSMTurbo2
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anybody have anything else to add on this.. i have been putting off working on it but need to get it done.

i guess at one time the egr valve was stuck open aswell??? its not now and it was cleaned very well..
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Old 07-03-2004, 10:57 AM   #4
Siper2
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Impreza GC8 Me, too.

Here's another thread on cylinder misfires:

http://forums.nasioc.com/forums/show...hreadid=563477

You can read about my woes in there.

Yesterday I replaced my fuel filter, in hopes of possibly getting the P0304 to go away. I read in a recent "End Wrench" (Subaru mechanic's magazine) that recently-replaced fuel filters can cause the misfires sometimes. By that token I thought maybe an old one might do the same. Mine hadn't been replaced in about 45k miles.

Who knows. I've replaced plugs, wires and the coil, and have done compression and leakdown tests. All come back clean.

Someone suggested a valve adjustment, but I've also been told that the valves on my car don't even NEED to be adjusted. If someone can clarify, I'd appreciate it.

I had them adjusted at my 30k service, maybe 60k too... but I think it was the dealership that did my 60k who told me valves on the EJ25 don't need adjusting. So who knows....

=S2=
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Old 07-14-2004, 02:44 AM   #5
DSMTurbo2
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i think im just going to take it in i guess.. im running out of things to test
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Old 07-14-2004, 08:27 AM   #6
Siper2
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Let us know what you find out.


Maybe it'll be something revolutionary that 6 gazillion hours at the last dealership didn't solve, for me.
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Old 07-14-2004, 06:37 PM   #7
Keith99RS
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Siper - What are you running for octane? My wifes OB kept getting misfire codes, even after I replaced the plugs and wires. I had her switch to running 89 octane instead of her usual 87, and all has been well. I do the same thing with my RS and all has been good, even when my pulgs and wires were totally shot. Just a suggestion.
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Old 07-14-2004, 09:04 PM   #8
Siper2
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I've always run 87. (Except for a span of about a year, from 2001-2002 off and on, when I was in the midwest and local ethanol sources made 89 cheaper than 87.)

Why would a code like this start just randomly after four years on the same gas??

I mean, I can try it, but.... the car's meant to run on 87, and I'd rather save the money I guess.
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Old 07-15-2004, 12:11 AM   #9
Keith99RS
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My wifes car ran fine on 87 for years too. My guess is all the new additives (MTBE and the like) and such they have begun playing with in the fuel. Nothing to lose by giving it a shot.
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Old 07-15-2004, 12:49 AM   #10
Siper2
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Yeah I guess. One of the guys on i-Club suggested a valve adjustment, too.

I guess they're recommended on post 1997 EJ engines, since they switched to solid lifters?



Hey, I'll try anything once.
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