help with misfire please?

silverongold · 02-22-2011, 06:28 PM

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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silverongold · 02-23-2011, 12:07 AM

any help?

toddguy · 02-23-2011, 12:59 AM

i didn't read this whole thing... but

http://www.wrxtuners.com/forums/f72/...re-help-23330/

silverongold · 02-23-2011, 01:45 AM

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

aclver1 · 02-23-2011, 10:45 AM

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.

silverongold · 02-23-2011, 10:52 AM

just put some lucas cleaner in yesterday so we will see what that and the filter does for me today

medamullet · 02-23-2011, 11:50 AM

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.

car_cursed · 02-23-2011, 12:34 PM

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

silverongold · 02-23-2011, 12:35 PM

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?

car_cursed · 02-23-2011, 01:13 PM

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.

06HAWKMAN · 02-23-2011, 01:15 PM

Have you pulled the plugs at all to see what they look like?

silverongold · 02-23-2011, 01:17 PM

yeah i replaced the plugs even thought the ones in there looked good.

silverongold · 02-23-2011, 01:18 PM

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?

silverongold · 02-23-2011, 01:20 PM

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.

Sports Wagon · 02-23-2011, 01:34 PM

Have you ran a fresh tank of E or 91 through the system?

scoobydorift · 02-23-2011, 01:34 PM

Quote:

Originally Posted by silverongold

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?

aclver1 · 02-23-2011, 02:42 PM

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.

scoobydorift · 02-23-2011, 02:48 PM

Quote:

Originally Posted by aclver1

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.

aclver1 · 02-23-2011, 04:23 PM

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.

silverongold · 02-23-2011, 04:33 PM

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

medamullet · 02-23-2011, 06:47 PM

raise your idle up to 900 and see what happens.

silverongold · 02-23-2011, 07:33 PM

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

02-22-2011, 06:28 PM	#1
silverongold Scooby Specialist Member#: 132599 Join Date: Nov 2006 Chapter/Region: RMIC Location: St George Vehicle: 02 impreza wrx silver	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 * Registered users of the site do not see these ads.

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02-23-2011, 12:07 AM	#2
silverongold Scooby Specialist Member#: 132599 Join Date: Nov 2006 Chapter/Region: RMIC Location: St George Vehicle: 02 impreza wrx silver	any help?

02-23-2011, 12:59 AM	#3
toddguy Scooby Specialist Member#: 158534 Join Date: Sep 2007 Chapter/Region: RMIC Location: Provo, Utah Vehicle: 99 2.5 Wagon	i didn't read this whole thing... but http://www.wrxtuners.com/forums/f72/...re-help-23330/

02-23-2011, 01:45 AM	#4
silverongold Scooby Specialist Member#: 132599 Join Date: Nov 2006 Chapter/Region: RMIC Location: St George Vehicle: 02 impreza wrx silver	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

02-23-2011, 10:45 AM	#5
aclver1 Scooby Specialist Member#: 114177 Join Date: May 2006 Chapter/Region: RMIC Location: SLC utah Vehicle: 2004 Impreza 2.5rs 70 Datsun Fairlady	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.

02-23-2011, 10:52 AM	#6
silverongold Scooby Specialist Member#: 132599 Join Date: Nov 2006 Chapter/Region: RMIC Location: St George Vehicle: 02 impreza wrx silver	just put some lucas cleaner in yesterday so we will see what that and the filter does for me today

02-23-2011, 11:50 AM	#7
medamullet Scooby Guru Member#: 99442 Join Date: Oct 2005 Chapter/Region: International Location: Man of Mystery Vehicle: 2006 SGM STI I'm on CORN YO!	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.

02-23-2011, 12:35 PM	#9
silverongold Scooby Specialist Member#: 132599 Join Date: Nov 2006 Chapter/Region: RMIC Location: St George Vehicle: 02 impreza wrx silver	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?

02-23-2011, 01:15 PM	#11
06HAWKMAN Scooby Specialist Member#: 166626 Join Date: Dec 2007 Chapter/Region: RMIC Location: salt lake city utah Vehicle: 2006 wrx ewg vf39'd obp	Have you pulled the plugs at all to see what they look like?

02-23-2011, 01:17 PM	#12
silverongold Scooby Specialist Member#: 132599 Join Date: Nov 2006 Chapter/Region: RMIC Location: St George Vehicle: 02 impreza wrx silver	yeah i replaced the plugs even thought the ones in there looked good.

02-23-2011, 01:18 PM	#13
silverongold Scooby Specialist Member#: 132599 Join Date: Nov 2006 Chapter/Region: RMIC Location: St George Vehicle: 02 impreza wrx silver	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?

02-23-2011, 01:20 PM	#14
silverongold Scooby Specialist Member#: 132599 Join Date: Nov 2006 Chapter/Region: RMIC Location: St George Vehicle: 02 impreza wrx silver	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.

02-23-2011, 01:34 PM	#15
Sports Wagon Scooby Specialist Member#: 43081 Join Date: Sep 2003 Location: Think with your Dipstick	Have you ran a fresh tank of E or 91 through the system?

02-23-2011, 02:42 PM	#17
aclver1 Scooby Specialist Member#: 114177 Join Date: May 2006 Chapter/Region: RMIC Location: SLC utah Vehicle: 2004 Impreza 2.5rs 70 Datsun Fairlady	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.

02-23-2011, 04:23 PM	#19
aclver1 Scooby Specialist Member#: 114177 Join Date: May 2006 Chapter/Region: RMIC Location: SLC utah Vehicle: 2004 Impreza 2.5rs 70 Datsun Fairlady	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.

02-23-2011, 04:33 PM	#20
silverongold Scooby Specialist Member#: 132599 Join Date: Nov 2006 Chapter/Region: RMIC Location: St George Vehicle: 02 impreza wrx silver	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

02-23-2011, 06:47 PM	#21
medamullet Scooby Guru Member#: 99442 Join Date: Oct 2005 Chapter/Region: International Location: Man of Mystery Vehicle: 2006 SGM STI I'm on CORN YO!	raise your idle up to 900 and see what happens.

02-23-2011, 07:33 PM	#22
silverongold Scooby Specialist Member#: 132599 Join Date: Nov 2006 Chapter/Region: RMIC Location: St George Vehicle: 02 impreza wrx silver	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