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Old 02-22-2011, 07:28 PM   #1
silverongold
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Default help with misfire please?

So I got check engine codes for misfire in all four cylinders. I thought it was due to bad e85 from over the winter fowling plugs. I changed the plugs and it came back on. I just added fuel system cleaner and am going to drive it for like 20 miles and then see if it stays off or still misfires. with a misfire in all four cylinders what would it be? ignition coil pack or some thing?
thanks
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Old 02-23-2011, 01:07 AM   #2
silverongold
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any help?
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Old 02-23-2011, 01:59 AM   #3
toddguy
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i didn't read this whole thing... but

http://www.wrxtuners.com/forums/f72/...re-help-23330/
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Old 02-23-2011, 02:45 AM   #4
silverongold
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thank you todd guy! maybe a fuel filter. . . . .honestly i dont think i have ever changed it. if that is clogged it would cause all four to miss. guess we will se tomorrow. it is seriously nuts how many things can case a misfire. i guess i am narrowing down the options though
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Old 02-23-2011, 11:45 AM   #5
aclver1
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I know, i'm working on a misfire in one cylinder and it's been a beach to track down. I finally just did a leak down test to make sure it wasn't a valve and i was good so back to research. The only things i' have left are the expensive stuff, cat, coil pack, front O2. usually with all four it's fuel related, run some injector cleaner through it after you change the filter.
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Old 02-23-2011, 11:52 AM   #6
silverongold
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just put some lucas cleaner in yesterday so we will see what that and the filter does for me today
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Old 02-23-2011, 12:50 PM   #7
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I have never had luck with fuel cleaner. take them out and send them in to a place that can clean them right. Deatschwerks for 1. also check your lines that go to your fuel pressure regulator. if you are not increasing the pressure you could be running lean and causing misfires. see if the line is pinched or cracked.
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Old 02-23-2011, 01:34 PM   #8
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Quote:
Originally Posted by medamullet
I have never had luck with fuel cleaner. take them out and send them in to a place that can clean them right. Deatschwerks for 1. also check your lines that go to your fuel pressure regulator. if you are not increasing the pressure you could be running lean and causing misfires. see if the line is pinched or cracked.
There's a local place that can clean and flow test them. Injecter Tech
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Old 02-23-2011, 01:35 PM   #9
silverongold
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well some people are saying it could be coil packs and you peeps are saying injectors or fuel leak/ pinch, running rich all of these could be a cause and i will check them all thanks for the help! can any one tell me how to test coil packs?
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Old 02-23-2011, 02:13 PM   #10
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Quote:
Originally Posted by silverongold
well some people are saying it could be coil packs and you peeps are saying injectors or fuel leak/ pinch, running rich all of these could be a cause and i will check them all thanks for the help! can any one tell me how to test coil packs?
Get a know working one and start swapping.
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Old 02-23-2011, 02:15 PM   #11
06HAWKMAN
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Have you pulled the plugs at all to see what they look like?
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Old 02-23-2011, 02:17 PM   #12
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yeah i replaced the plugs even thought the ones in there looked good.
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Old 02-23-2011, 02:18 PM   #13
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well i do not know if any of my coil packs are good to swap around because it is throwing a code for all fou cylinders. is there a way to do it with a meter or some thing?
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Old 02-23-2011, 02:20 PM   #14
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i do not see a pinch or leak and have not smelled any thing so i think that one is out. i am going to go drive it now and see if the new fuel filter fixes it.
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Old 02-23-2011, 02:34 PM   #15
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Have you ran a fresh tank of E or 91 through the system?
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Old 02-23-2011, 02:34 PM   #16
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Quote:
Originally Posted by silverongold View Post
well i do not know if any of my coil packs are good to swap around because it is throwing a code for all fou cylinders. is there a way to do it with a meter or some thing?
I doubt all 4 coils would go bad. Let us know how she feels after the drive with the new filter. If it's still misfiring, it may not be a bad idea to run a boost leak test.

Also does the car feel like it's misfiring? What are the symptoms besides the CEL?
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Old 02-23-2011, 03:42 PM   #17
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Are the wrx's coil on plug like the sti? my rs isn't, mine has just one coil pack so there is a chance if it goes bad all 4 would misfire.
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Old 02-23-2011, 03:48 PM   #18
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Quote:
Originally Posted by aclver1 View Post
Are the wrx's coil on plug like the sti? my rs isn't, mine has just one coil pack so there is a chance if it goes bad all 4 would misfire.

Yeah all USDM WRX/STi's use coil on plug, and while it's not impossible for them to go bad, they seem to be pretty reliable.
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Old 02-23-2011, 05:23 PM   #19
aclver1
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Yeah, not likely that 4 would go bad. I wish i had coil on plug, that was the next thing i was going to replace. $180 sucks know knowing if that will fix it.
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Old 02-23-2011, 05:33 PM   #20
silverongold
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figured it out! with help from the subaru lord chris at metric. with 1000 cc injectors there can be an idle problem. so i pulled the freeze frame data with a scanner and it said i misfired at 780 rpms. so it must be fuel delivery issues at low rpms. so i guess that is it folks
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Old 02-23-2011, 07:47 PM   #21
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raise your idle up to 900 and see what happens.
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Old 02-23-2011, 08:33 PM   #22
silverongold
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yeah that is what i am going to try. it drops up and down a bit with the cams so i think if i rais it it will fix the issue hope fully
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