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Old 04-05-2011, 11:37 PM   #1
JON-E25WRX
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Default misfire help!

so recently earlier today i was driving on the free way, then suddenly my CEL starts blinking. i check the code (P0304).

as soon as i got off work i strolled over to rallysport to pick up a new set of spark plugs(oem). installed them, but seems to still be blinking? any input would be greatly appreciated.
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Old 04-06-2011, 12:19 AM   #2
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you will need to clear the code. pull the neg battery terminal and let it sit for a bit. Or take it to autozone and have them clear the code with their reader.
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Old 04-06-2011, 12:23 AM   #3
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If its still flashing then it is still misfiring in cylinder 4. Could be injector, tune, burnt valve etc.
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Old 04-06-2011, 12:58 AM   #4
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Quote:
Originally Posted by medamullet
you will need to clear the code. pull the neg battery terminal and let it sit for a bit. Or take it to autozone and have them clear the code with their reader.
They won't clear the codes, just read them. You can borrow the reader and clear them yourself.
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Old 04-06-2011, 01:12 AM   #5
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could be coil pack.. swap that after you reset the code and see if the mis fire follows the coil pack.

thats been my misfire problem both times
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Old 04-06-2011, 01:20 AM   #6
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Good luck Jon!
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Old 04-06-2011, 03:04 AM   #7
JON-E25WRX
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Quote:
Originally Posted by medamullet View Post
you will need to clear the code. pull the neg battery terminal and let it sit for a bit. Or take it to autozone and have them clear the code with their reader.
well after installing the spark plugs then firing it up, no codes were read. even after i had the car idle for a good minute or two. then after i finished reinstalling everything and drove the car around the block and a rough idle started again and the blinking CEL.

Quote:
Originally Posted by bhhamblin View Post
If its still flashing then it is still misfiring in cylinder 4. Could be injector, tune, burnt valve etc.
alright i'll see if i can check those out

Quote:
Originally Posted by soob noob View Post
could be coil pack.. swap that after you reset the code and see if the mis fire follows the coil pack.
so did you buy new coil packs?

Quote:
Originally Posted by axleon2 View Post
Good luck Jon!
thanks aaron, just hope i can get it runnin right soon.
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Old 04-06-2011, 07:51 AM   #8
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Quote:
Originally Posted by soob noob View Post
could be coil pack.. swap that after you reset the code and see if the mis fire follows the coil pack.

thats been my misfire problem both times
This. Try swapping it with the opposite coilpack and see if it still does it on that one cylinder.
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Old 04-06-2011, 09:47 AM   #9
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Once I found out my coil pack was bad I bought a new one... Just switch the two right next to each other. But remember to switch the wires that plug into them. Does that make sense?
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Old 04-06-2011, 10:14 AM   #10
JON-E25WRX
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yeah just keep the black clips in the back and whites in the front ones
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Old 04-06-2011, 10:55 AM   #11
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if the CEL doesn't follow the coilpack. Do the same thing with the injector. I have had injectors go bad. If it's 4 that is the problem switch 2 and 4 injectors (after you try the coilpack) if the cel follows the injector that's your problem. Don't fool around with the off the shelf injector cleaner it doesn't do ANY good. If they are dirty send them in to Deatschwerks and have them actually cleaned.
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Old 04-06-2011, 01:53 PM   #12
JON-E25WRX
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alright i'mma try to switch the coilpacks/injectors around right now
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Old 04-06-2011, 02:53 PM   #13
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good luck ive been chasing a misfire since june, and silverongold is chasing one to. the funny thing is we all have 02-03 wrx.
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Old 04-06-2011, 04:19 PM   #14
JON-E25WRX
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haha a bugeye curse

well just swapped my #4 coil pack with #2 and then it misfired cylinders 1,2,&4?

i then swapped the sparkplugs and swapped the coilpacks back and is now back to misfiring #4. so my guess would be the coilpack?
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Old 04-06-2011, 05:18 PM   #15
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weird? maybe try swapping coil packs one more time.. maybe switch 4 with 1 and make sure to reset the ecu.

sucks jon sorry. i hope you figure it out fast
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Old 04-06-2011, 05:32 PM   #16
JON-E25WRX
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the ecu should automatically reset once the battery terminal is removed anyways right?
i'll try swapping them once more tonight after work i guess
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Old 04-06-2011, 08:56 PM   #17
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I just had a guy bring me his 02 wrx wagon in for the same reason, blinking MIL and running like garbage! Misfires were on 1,3,&4. I unplugged all the coil packs from the harness and turned the key to the start position. Listening to the motor crank, it sounded very uneven, like it loped every revolution. I then did a compression check. 1 and 4 were at 0! Turns out he had been running 85 octane in it for the last 2 years. Burnt motor, for sure.

Thats the first thing I do when I diagnose misfires, turn the motor without ignition and listen for an even, or uneven crank. If that test clears, then I move on to coils, plugs, compression and then fuel.
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Old 04-07-2011, 04:50 PM   #18
JON-E25WRX
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well just finished switching my coilpacks around and still cylinder 4 is misfiring. i'm still going to find a set of coilpacks to replace and see if that helps
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Old 04-07-2011, 05:02 PM   #19
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I had a cyl 3 misfire and i went through everything and the last thing i finally did was swap cyl 3 and 4 plugs and it stopped, for some reason, it just didn't like that plug in cyl 3 but once it was moved to cyl 4 it was fine. After changing plugs, wires, adjusting valve lash 10x, doing a leak down test, rear O2 sensor and fuel injector cleaner, just moving the plugs fixed it.
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Old 04-07-2011, 05:30 PM   #20
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if you switched the coilpacks around and it's still in the same cylinder I wouldn't spend money on coilpacks. I think you have ruled that out. I would move on to injectors and swap them around and see if the CEL follows the injector.
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Old 04-07-2011, 06:01 PM   #21
JON-E25WRX
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hm... i'll start switching my sparkplugs around then.

if that doesn't work then i guess i'll work on my injectors
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Old 04-07-2011, 06:25 PM   #22
soob noob
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Yeah I would go to injectors next... They are a pain in the ass haha but that would be my next move.. You might need to buy some new donut gasket things that go on the end of the injectors. Maybe grab some Vaseline so the injectors slide in easier and don't tear the gasket
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Old 04-07-2011, 06:26 PM   #23
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For what its worth: My car had the p0304 code come up a week ago. I had the spark plugs replaced and nothing changed so I took it down to Solid Auto again and found out I had a burnt valve on cylinder four, which apparently isn't that uncommon at my milage (115K) If you have the tool, you should check your compression, which will let you know if its actual damage or something like a coilpack, fuel filter, dirty manifold etc.
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Old 04-07-2011, 06:33 PM   #24
JON-E25WRX
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dang, i really dont feel like doing my injectors. oh well if that doesn't go well i'll just take it in somewhere.
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Old 04-07-2011, 07:30 PM   #25
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Time to trade it in...
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