misfiring problems

shortfuseWRX · 02-18-2004, 11:54 PM

hey guys i jus thave a few questions that need answering.
i have an 03 wrx that has a fmic stage 4 on it and is having very bad misfiring problems. currently it is an unspecfic misfire and i cant seem to be rid of it. i took it to my dealershipa nd they said they wont even work on it. i hav ereplaced everything that it may have been like plugs and coils. fuel system has been checked twice. compression, timing, everything. the shop it took it too think it may be the utec i have, but when it is disconnected the car does the same thing, mifiring at idle and throughout the entire powerband that is. so now they're gonna try the valve stiffness and spacing. so as you can see im in a pickle of a situation. and thing that would help me diagnois this problem would be much appriciated. thanks

sam

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eastcoastbumps · 02-19-2004, 12:47 AM

Does the car run fine, just like all of these guys?

http://forums.nasioc.com/forums/show...hreadid=401993

I've been getting misfires lately. But I think I know what caused mine. They're not just random.

Pete

shortfuseWRX · 02-19-2004, 12:50 AM

wow thanks for the info pete. yeah my car runs a lot liek that but we checked everything and still cant think of whta it could be, everything they talked about on the thread that is. and i aslo forgot to mention that i have burn out several coils. they're thinking it may be my plugs. i have the smae heat range plugs but with an iridium element.

eastcoastbumps · 02-19-2004, 08:45 AM

How does the car run with a burnt out coil? Im' guessing its really rough, misfiring on every revolution.

j-speedracer · 02-19-2004, 12:42 PM

how do you recognize a misfire? is it anything like the pinging of detonation?

is throwing a code the only way to tell?

eastcoastbumps · 02-19-2004, 06:34 PM

Throwing a code is the only way to tell. I've been getting misfires all the time and the car seems to run fine. But my car actually has a problem, unlike the cars in that other thread.

The engine uses crank angle velocity to determine if a cylinder doesn't fire. It uses sensors and crazy calculations to figure it out.

Pete

SubieRacer · 02-19-2004, 07:20 PM

i know this may sound dumb...but...could it be a bad tank of gas??

might be worth trying different gas.

shortfuseWRX · 02-19-2004, 08:11 PM

yeah i tried that soulution i spent over 100$ on dumping out and filling up with gas. i even flushed the system twice. so it isnt gas.
runnign with a burnt out coil is like turely running on three cylinders. no hp, and no throttle response. you have to slip the clutch a lot to get it to go and keep the revs up long enough to go. very bad felling. i guess it would feel liek you car is about to stall all the time but it keeps going, that is the best expalnation i can give you.

02-18-2004, 11:54 PM	#1
shortfuseWRX Scooby Specialist Member#: 38573 Join Date: Jun 2003 Location: Anchorage, AK Vehicle: 1997 toyota tacoma Black death	misfiring problems hey guys i jus thave a few questions that need answering. i have an 03 wrx that has a fmic stage 4 on it and is having very bad misfiring problems. currently it is an unspecfic misfire and i cant seem to be rid of it. i took it to my dealershipa nd they said they wont even work on it. i hav ereplaced everything that it may have been like plugs and coils. fuel system has been checked twice. compression, timing, everything. the shop it took it too think it may be the utec i have, but when it is disconnected the car does the same thing, mifiring at idle and throughout the entire powerband that is. so now they're gonna try the valve stiffness and spacing. so as you can see im in a pickle of a situation. and thing that would help me diagnois this problem would be much appriciated. thanks sam * Registered users of the site do not see these ads.

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02-19-2004, 12:47 AM	#2
eastcoastbumps Scooby Guru Member#: 29201 Join Date: Nov 2002 Chapter/Region: NESIC Location: Shrewsbury, MA Vehicle: BMW M3 Honda S2000x2	Does the car run fine, just like all of these guys? http://forums.nasioc.com/forums/show...hreadid=401993 I've been getting misfires lately. But I think I know what caused mine. They're not just random. Pete

02-19-2004, 12:50 AM	#3
shortfuseWRX Scooby Specialist Member#: 38573 Join Date: Jun 2003 Location: Anchorage, AK Vehicle: 1997 toyota tacoma Black death	wow thanks for the info pete. yeah my car runs a lot liek that but we checked everything and still cant think of whta it could be, everything they talked about on the thread that is. and i aslo forgot to mention that i have burn out several coils. they're thinking it may be my plugs. i have the smae heat range plugs but with an iridium element.

02-19-2004, 08:45 AM	#4
eastcoastbumps Scooby Guru Member#: 29201 Join Date: Nov 2002 Chapter/Region: NESIC Location: Shrewsbury, MA Vehicle: BMW M3 Honda S2000x2	How does the car run with a burnt out coil? Im' guessing its really rough, misfiring on every revolution.

02-19-2004, 12:42 PM	#5
j-speedracer Scooby Specialist Member#: 48897 Join Date: Nov 2003 Chapter/Region: MWSOC Location: Fort Wayne Vehicle: 02 WRX Silver	how do you recognize a misfire? is it anything like the pinging of detonation? is throwing a code the only way to tell?

02-19-2004, 06:34 PM	#6
eastcoastbumps Scooby Guru Member#: 29201 Join Date: Nov 2002 Chapter/Region: NESIC Location: Shrewsbury, MA Vehicle: BMW M3 Honda S2000x2	Throwing a code is the only way to tell. I've been getting misfires all the time and the car seems to run fine. But my car actually has a problem, unlike the cars in that other thread. The engine uses crank angle velocity to determine if a cylinder doesn't fire. It uses sensors and crazy calculations to figure it out. Pete

02-19-2004, 07:20 PM	#7
SubieRacer Scooby Newbie Member#: 775 Join Date: Jan 2000 Location: usa	i know this may sound dumb...but...could it be a bad tank of gas?? might be worth trying different gas.

02-19-2004, 08:11 PM	#8
shortfuseWRX Scooby Specialist Member#: 38573 Join Date: Jun 2003 Location: Anchorage, AK Vehicle: 1997 toyota tacoma Black death	yeah i tried that soulution i spent over 100$ on dumping out and filling up with gas. i even flushed the system twice. so it isnt gas. runnign with a burnt out coil is like turely running on three cylinders. no hp, and no throttle response. you have to slip the clutch a lot to get it to go and keep the revs up long enough to go. very bad felling. i guess it would feel liek you car is about to stall all the time but it keeps going, that is the best expalnation i can give you.