02 wrx missfires on all 4 cylinders

mattmx525 · 01-23-2009, 06:44 PM

02 wrx 97xxx miles. 20g, ewg, meth, fmic, 750cc inj ect. iv had a rough idle before and cleaning the IAC seemed to fix that. so yet again about a week ago i cleaned it again cuz my idle was gettin bad again, and it was dirty. in the last few days i started noticing a studder at low rpm getting up to speed, which has steadily gotten worse and today the car is blinking the cel and breaking up... no idea whats bad. i cleaned the maf, and IAC and no different. dunno coil, plugs, timing belt.. any ideas?

* Registered users of the site do not see these ads.

Uncle Scotty · 01-23-2009, 07:44 PM

ya likely blew it up

check compression

mattmx525 · 01-23-2009, 08:07 PM

well, it backfires alitle and shutters then gets through...then has no loss in power at all, idles fine. no sighnes of a blown motor such as smoke or power loss. it begun happening after my last gas fillup as well, possibly a fuel related problem. but i guuess thats something to check

meebs · 01-23-2009, 08:38 PM

When was the last time you replaced the fuel filter?

zaxrex · 01-25-2009, 03:07 AM

The CEL is blinking? Is that from your EM? What codes do you have?

StupidFastWagon · 01-25-2009, 03:45 AM

Let me ask you this, What EM do you have and who tuned your car?

mattmx525 · 01-25-2009, 08:54 PM

i havent changed my fuel filter ever, unless it was changed when i got my 255 fp put it. but i think theres two? my engine management is Ecutek and tuned by extreme motorsports.

mattmx525 · 01-25-2009, 08:55 PM

and the codes are p301, p302, p303, p304. all cylinder misfires.

psm04wrx · 01-25-2009, 09:39 PM

sounds like possible harness issue

BluScubi · 01-25-2009, 10:36 PM

Check compression, take a look at your plugs while you're in there. If they have never been changed you should change them anyways. It's very unlikely ALL of your coil packs went bad at once. In my experience misfire on all cylinders can be caused by running too rich or too lean as well.

Uncle Scotty · 01-25-2009, 11:27 PM

Quote:

02 wrx 97xxx miles

Quote:

Originally Posted by mattmx525

i havent changed my fuel filter ever,

......

Tut4u2 · 01-25-2009, 11:37 PM

Fuel filter needs to be changed every 30k miles I believe.

And like everyone has suggested, check your compression, and while you're at it change your spark plugs as well if you haven't done that recently. Consistent misfire could also mean that your coils are bad, but having all 4 go at the same time seems a long shot.

mattmx525 · 01-27-2009, 05:45 PM

changed the fuel filter and no different. now its only misfiring on the 2nd and 4th cylinders. aka p302 pd, p304 pd. so they missfire over and over again. breaking up and alot of shaking when i test drove it. backfiring when coming into boost. havent got around to a comp test the weather here is killin me. iv come up with maybe its a bad injector(s), spark plugs, coils..i guess ill start goin down the line. anyone else had problems like this? where to start?

BluScubi · 01-27-2009, 06:53 PM

Sounds stupid but try reseting the ECU. I had a situation once where I changed plugs and it ran like crap afterwards because the fuel trims had compensated for the bad plugs. Reset the ECU and it ran pefect.

Tut4u2 · 01-27-2009, 07:00 PM

I would check the coils first. Since you're getting misfires now on one side of the engine just switch the coils with the otherside and see if you start misfiring 1 and 3 now; if you do then you need 2 new coils.

rafacz2002 · 01-27-2009, 07:15 PM

i had same problem not long ago. try changing the spark plugs. if that doesnt help than you will have to replace your coil on plugs.

2bad240 · 01-27-2009, 07:23 PM

my car is doing the same thing. happened after i changed my injectors and switched tune.

mattmx525 · 01-27-2009, 08:29 PM

yea i reset my ecu after i did the fuel filter. i guess ill start with the coils then, probably change the plugs while im at it

rafacz2002 · 01-27-2009, 11:57 PM

do plugs first new coils are about 400 bucks. thats where i made my mistake and bought new coils instead of checking plugs. i replaced my coils and it turned out to be the plugs being the problem. so i have a perfect set of used coils sitting in my closet

mattmx525 · 01-28-2009, 07:05 AM

yea alright. iv got the ngk iriduim one step colder plugs in there now, and there only about 20,000 miles old. so its possible their bad i guess, my car does seem to run rich so maybe that had something to do with it.

Tut4u2 · 01-28-2009, 10:11 AM

try putting in some stock NGKs im there. and check the gap on yourr cirrent p.ugs

sigurd · 01-28-2009, 10:45 AM

spark plugs dude. Like ^^he said put stock ones in there and gap them.

mattmx525 · 01-28-2009, 10:32 PM

new plugs no difference. brought it to the shop for a full diagnostic to actually see whats wrong. hopefully ill know by tmro

NitroTrike · 01-29-2009, 04:18 PM

Matt, I have a similar setup on an 02 with 105k miles. Every now and then i get misfire codes from all 4 at once too. However, mine is caused by the "just a little too light" flywheel i put put on there (i don't recall the weight, but Dave at Rallispec said it's borderline and "may" cause misfire codes - and it does), which throws the crank and cam sensors out of phase just enough to throw the codes. I'm sure my driving habits contribute to that too though =]

You don't by chance have a lightened flywheel, do you?

I would also check the 'obvious' stuff.. oil covered MAF sensor (did this once to myself by not letting the K&N oil soak in long enough on the filter. Got around the block and it sputtered to a halt). It can be cleaned with a q-tip and rubbing alcohol.

I've also had my MAP sensor o-ring 'spit' and cause weird problems...

It really could be anything. Front O2 sensors can get 'flaky' and cause the engine to be over fueled, yet never throw a O2 sensor code. My front one failed at around 85k. When that happened, it ran like an old chevy with the choke flap jammed shut... black smoke, shuttering, sputtering, backfiring. Damn thing didn't give any warning either.

mattmx525 · 01-29-2009, 04:23 PM

yea iv got a 9.5 lb prolight findazia flywheel ha. but i cleansed the maf n whatnot, yet the diagnostic i got says iv got a bad TGV asssemmbly? wtf. which is a 600 dollar part and damn i really doubt if that solves any problems. its not throwing that code at all. they said an injector is overloading a cylinder becasue of this, that the tgv interfered with the pulse of the injector. i think hes full of it because this makes no sense to me. What do yal think?

01-23-2009, 06:44 PM	#1
mattmx525 Scooby Newbie Member#: 118525 Join Date: Jun 2006 Location: harwood Md Vehicle: 2002 wrx. stg 4+ blue	02 wrx missfires on all 4 cylinders 02 wrx 97xxx miles. 20g, ewg, meth, fmic, 750cc inj ect. iv had a rough idle before and cleaning the IAC seemed to fix that. so yet again about a week ago i cleaned it again cuz my idle was gettin bad again, and it was dirty. in the last few days i started noticing a studder at low rpm getting up to speed, which has steadily gotten worse and today the car is blinking the cel and breaking up... no idea whats bad. i cleaned the maf, and IAC and no different. dunno coil, plugs, timing belt.. any ideas? * Registered users of the site do not see these ads.

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Missfire on all 4 cylinders...	Skippy5883	Factory 2.0L Turbo Powertrain	2	03-31-2009 08:31 PM
Missfire on all 4 cylinders	califesaver	Factory 2.0L Turbo Powertrain	9	09-20-2008 10:12 PM
Help. Missfire on all 4 cylinders.	Chaotic Yeti	Factory 2.0L Turbo Powertrain	5	04-24-2008 03:07 PM
Missfire on all 4 cyl. 04 sti	trbowrx	Factory 2.5L Turbo Powertrain	5	01-29-2008 02:19 PM
misfiring on all 4 cylinders	tEkkGOD	Factory 2.0L Turbo Powertrain	12	09-08-2003 09:26 PM

01-23-2009, 07:44 PM	#2
Uncle Scotty NASIOC Supporter Member#: 16200 Join Date: Mar 2002 Vehicle: OK Houston we have an Uncle	ya likely blew it up check compression

01-23-2009, 08:07 PM	#3
mattmx525 Scooby Newbie Member#: 118525 Join Date: Jun 2006 Location: harwood Md Vehicle: 2002 wrx. stg 4+ blue	well, it backfires alitle and shutters then gets through...then has no loss in power at all, idles fine. no sighnes of a blown motor such as smoke or power loss. it begun happening after my last gas fillup as well, possibly a fuel related problem. but i guuess thats something to check

01-23-2009, 08:38 PM	#4
meebs Scooby Specialist Member#: 3251 Join Date: Dec 2000 Chapter/Region: NWIC Location: Lake Tapps, WA Vehicle: 2009 WRX Hatch DGM	When was the last time you replaced the fuel filter?

01-25-2009, 03:07 AM	#5
zaxrex Scooby Specialist Member#: 9898 Join Date: Sep 2001 Chapter/Region: MAIC Location: VA near MD Vehicle: 2002 WRX Water Injected Blue	The CEL is blinking? Is that from your EM? What codes do you have?

01-25-2009, 03:45 AM	#6
StupidFastWagon Scooby Specialist Member#: 157526 Join Date: Aug 2007 Chapter/Region: RMIC Location: Colorado Springs Vehicle: 2013 328i xDrive M Sport	Let me ask you this, What EM do you have and who tuned your car?

01-25-2009, 08:54 PM	#7
mattmx525 Scooby Newbie Member#: 118525 Join Date: Jun 2006 Location: harwood Md Vehicle: 2002 wrx. stg 4+ blue	i havent changed my fuel filter ever, unless it was changed when i got my 255 fp put it. but i think theres two? my engine management is Ecutek and tuned by extreme motorsports.

01-25-2009, 08:55 PM	#8
mattmx525 Scooby Newbie Member#: 118525 Join Date: Jun 2006 Location: harwood Md Vehicle: 2002 wrx. stg 4+ blue	and the codes are p301, p302, p303, p304. all cylinder misfires.

01-25-2009, 09:39 PM	#9
psm04wrx Scooby Specialist Member#: 134804 Join Date: Dec 2006 Chapter/Region: NESIC Location: Hyde Park,Ma Vehicle: 97 impreza L wagon beater black	sounds like possible harness issue

01-25-2009, 10:36 PM	#10
BluScubi Scooby Newbie Member#: 162726 Join Date: Oct 2007 Chapter/Region: MAIC Location: Land O' Speed cameras, MD Vehicle: 2009 LGT QSM	Check compression, take a look at your plugs while you're in there. If they have never been changed you should change them anyways. It's very unlikely ALL of your coil packs went bad at once. In my experience misfire on all cylinders can be caused by running too rich or too lean as well.

01-25-2009, 11:37 PM	#12
Tut4u2 Scooby Specialist Member#: 40424 Join Date: Jul 2003 Chapter/Region: MAIC Location: PA Vehicle: Its a boat on jack stands	Fuel filter needs to be changed every 30k miles I believe. And like everyone has suggested, check your compression, and while you're at it change your spark plugs as well if you haven't done that recently. Consistent misfire could also mean that your coils are bad, but having all 4 go at the same time seems a long shot.

01-27-2009, 05:45 PM	#13
mattmx525 Scooby Newbie Member#: 118525 Join Date: Jun 2006 Location: harwood Md Vehicle: 2002 wrx. stg 4+ blue	changed the fuel filter and no different. now its only misfiring on the 2nd and 4th cylinders. aka p302 pd, p304 pd. so they missfire over and over again. breaking up and alot of shaking when i test drove it. backfiring when coming into boost. havent got around to a comp test the weather here is killin me. iv come up with maybe its a bad injector(s), spark plugs, coils..i guess ill start goin down the line. anyone else had problems like this? where to start?

01-27-2009, 06:53 PM	#14
BluScubi Scooby Newbie Member#: 162726 Join Date: Oct 2007 Chapter/Region: MAIC Location: Land O' Speed cameras, MD Vehicle: 2009 LGT QSM	Sounds stupid but try reseting the ECU. I had a situation once where I changed plugs and it ran like crap afterwards because the fuel trims had compensated for the bad plugs. Reset the ECU and it ran pefect.

01-27-2009, 07:00 PM	#15
Tut4u2 Scooby Specialist Member#: 40424 Join Date: Jul 2003 Chapter/Region: MAIC Location: PA Vehicle: Its a boat on jack stands	I would check the coils first. Since you're getting misfires now on one side of the engine just switch the coils with the otherside and see if you start misfiring 1 and 3 now; if you do then you need 2 new coils.

01-27-2009, 07:15 PM	#16
rafacz2002 Scooby Newbie Member#: 169957 Join Date: Jan 2008 Chapter/Region: MWSOC Location: romeoville, illinois Vehicle: 2002 impreza wrx black	i had same problem not long ago. try changing the spark plugs. if that doesnt help than you will have to replace your coil on plugs.

01-27-2009, 07:23 PM	#17
2bad240 Scooby Newbie Member#: 141168 Join Date: Feb 2007 Chapter/Region: South East Location: new bern nc Vehicle: 2003 wrx S-wagon psm rotated hx35 6mt meth	my car is doing the same thing. happened after i changed my injectors and switched tune.

01-27-2009, 08:29 PM	#18
mattmx525 Scooby Newbie Member#: 118525 Join Date: Jun 2006 Location: harwood Md Vehicle: 2002 wrx. stg 4+ blue	yea i reset my ecu after i did the fuel filter. i guess ill start with the coils then, probably change the plugs while im at it

01-27-2009, 11:57 PM	#19
rafacz2002 Scooby Newbie Member#: 169957 Join Date: Jan 2008 Chapter/Region: MWSOC Location: romeoville, illinois Vehicle: 2002 impreza wrx black	do plugs first new coils are about 400 bucks. thats where i made my mistake and bought new coils instead of checking plugs. i replaced my coils and it turned out to be the plugs being the problem. so i have a perfect set of used coils sitting in my closet

01-28-2009, 07:05 AM	#20
mattmx525 Scooby Newbie Member#: 118525 Join Date: Jun 2006 Location: harwood Md Vehicle: 2002 wrx. stg 4+ blue	yea alright. iv got the ngk iriduim one step colder plugs in there now, and there only about 20,000 miles old. so its possible their bad i guess, my car does seem to run rich so maybe that had something to do with it.

01-28-2009, 10:11 AM	#21
Tut4u2 Scooby Specialist Member#: 40424 Join Date: Jul 2003 Chapter/Region: MAIC Location: PA Vehicle: Its a boat on jack stands	try putting in some stock NGKs im there. and check the gap on yourr cirrent p.ugs

01-28-2009, 10:45 AM	#22
sigurd Scooby Specialist Member#: 128721 Join Date: Oct 2006 Location: TN Vehicle: 2002 impreza WRX psm	spark plugs dude. Like ^^he said put stock ones in there and gap them.

01-28-2009, 10:32 PM	#23
mattmx525 Scooby Newbie Member#: 118525 Join Date: Jun 2006 Location: harwood Md Vehicle: 2002 wrx. stg 4+ blue	new plugs no difference. brought it to the shop for a full diagnostic to actually see whats wrong. hopefully ill know by tmro

01-29-2009, 04:18 PM	#24
NitroTrike Scooby Specialist Member#: 62408 Join Date: May 2004 Chapter/Region: South East Location: GWR, Florida Vehicle: 2002 wrx w/ STi guts 174k miles on Mobil 1	Matt, I have a similar setup on an 02 with 105k miles. Every now and then i get misfire codes from all 4 at once too. However, mine is caused by the "just a little too light" flywheel i put put on there (i don't recall the weight, but Dave at Rallispec said it's borderline and "may" cause misfire codes - and it does), which throws the crank and cam sensors out of phase just enough to throw the codes. I'm sure my driving habits contribute to that too though =] You don't by chance have a lightened flywheel, do you? I would also check the 'obvious' stuff.. oil covered MAF sensor (did this once to myself by not letting the K&N oil soak in long enough on the filter. Got around the block and it sputtered to a halt). It can be cleaned with a q-tip and rubbing alcohol. I've also had my MAP sensor o-ring 'spit' and cause weird problems... It really could be anything. Front O2 sensors can get 'flaky' and cause the engine to be over fueled, yet never throw a O2 sensor code. My front one failed at around 85k. When that happened, it ran like an old chevy with the choke flap jammed shut... black smoke, shuttering, sputtering, backfiring. Damn thing didn't give any warning either.

01-29-2009, 04:23 PM	#25
mattmx525 Scooby Newbie Member#: 118525 Join Date: Jun 2006 Location: harwood Md Vehicle: 2002 wrx. stg 4+ blue	yea iv got a 9.5 lb prolight findazia flywheel ha. but i cleansed the maf n whatnot, yet the diagnostic i got says iv got a bad TGV asssemmbly? wtf. which is a 600 dollar part and damn i really doubt if that solves any problems. its not throwing that code at all. they said an injector is overloading a cylinder becasue of this, that the tgv interfered with the pulse of the injector. i think hes full of it because this makes no sense to me. What do yal think?