- 02 wrx misfire under load I put in new plugs and wires, but it still has the miss. If P0304 is the only code you get when you plug an OBD II scanner into your WRX, this section should help you determine what is causing the code. Car does not feel to be misfiring while under load, in fact the car runs like a champ while accelerating or decelerating (assuming I don't clutch in) When driving, if I clutch in to slow down the car will occasionally shut off. Aug 30, 2018 · Ok, here's the issue, 02 speed 2. No code. The problem: Driving on level ground or up a hill, if I give the car a bit more gas, it will start bucking badly. bare with me through this please, I appreciate any and all help. I have gauges for roughness on 1-4 on the accessport and only 2 is effected. At 100k miles, I replaced the spark plugs, timing belt, water pump, TB pulley & tensioner, fuel filter, fuel pump (since I was cracking open the pump housing anyway, I figured an upgrade would be good). Feb 27, 2013 · problem now is, while I do have a misfire and 22611AL352 seems to be for some warm-up misfire issue, I don't have the associated P0030 DTC. I still have the acceleration problem. Brought my WRX in for a timing belt bout a week ago. Aug 5, 2013 · misfire under load no CEL 2002 wrx vf39 etc Service & Maintenance. Welcome to the North American Subaru Impreza Owners Club : Saturday October 12, 2024: Home: Forums May 16, 2012 · 02 wrx. Jul 4, 2009 · The car: 2001 Forester S 5MT with 150,000 miles on it. 0L Turbo) 7: 09-22 May 19, 2012 · OK, so 02 impreza wrx, got a OBD2 reader today because i have had a CEL for a couple of weeks. That proves you have a leak. It has VF39 turbo, grimmspeed water/oil separator, 1000cc injectors, Cobb stage 2 kit, up pipe, down pipe, headers no cats, mishimoto intercooler, access port 3, car was Dynoed & tuned at night Motorsports 22lb of boostany way it just recently started bucking at high boost mostly from 2nd to 3rd gear and the cel will flash I May 8, 2011 · ok guys and gals im in need of some help i have an 03 r6 that seems to have a misfire at idle/ under load. Nov 1, 2012 · I have an 09 wrx with turbo xs intake, tsudo catless dp, and obx cbe. If misfires stay in the same cylinders, not the coils, save the money and continue diagnosing. Fuel mileage may suffer. the car is all stock, 100k miles. Welcome to the North American Subaru Impreza Owners Club Feb 17, 2013 · serious vibration under low speed high load: jacky599r: Transmission (AT/MT) & Driveline: 9: 01-13-2009 10:53 AM: Rattling under car under load. , I 'seem' to experience it most often when cruising, or under light acceleration, but, that's normal everyday driving that occurs the most. Could it be the coil? Is this a Mar 28, 2012 · Car misfires at idle and you can feel the engine struggle. Took the car home and drives great EXCEPT when under load; CEL flashes, then shuts off. Under negative vac you are pushing metered air out under positive vacuum you are sucking in unmetered air. Scanner said misfire on cylinder 1. Jan 13, 2010 · Hi Guys, First time poster - any help would be greatly appreciated. They did the air filter, timing belt, and serpentine belts, and accessory belt. The only thing done to it is a ram air intake and a different exhaust can. 5. When the check engine light came back on, it still gave misfire codes on all cylinders apart from cylinder 4 and lean codes. However with the Clark tune, on every pull, cylinder 1 and 3 always misfires anywhere from 3-14 times in a row but never cylinder 2 or 4. 028"-. So the ECU reads this as random misfires. Doesn’t happen when starting the car only under load. Breaks up under wot usually in 2nd or 3rd unless you roll onto throttle slowly. Aug 31, 2013 · Misfire on cyl 1, flashing cel only under load starts ~2600 to 3000 then I let off. But there's that random misfire Dec 4, 2012 · Misfires under load are usually ignition problems. Then I did the following maintenance:. I wasn't having any problems until recently, after I changed the fuel filter. It has a Cobb intake, catless turboback exhaust and dyno tuned on open source. I can take the car back under 10 PSI and it will run perfectly, even at redline. Just a thought. I just did a transmission swap and put in a 4. So changed the spark plugs but CEL came back on. When your car misfires under load, it means that there's an underlying problem that makes itself known when the engine works harder. Here are the most common symptoms of P0301 in the Subaru WRX. Apr 16, 2012 · Today, I changed the plugs on 2 & 4 and re-oiled the filter element on the SPT intake it has. 5i Misfiring in 3 changed out spark plugs and wire new coil pack cleaned MAF Cleaned Injectors and Flopped 1 to 3 Here is how the car acts: when idling car runs smooth as butter under load car wont really accl. Nov 8, 2012 · if it did, I didn't notice. The problem is exacerbated when the AC is on. 5L Turbo Powertrain (EJ Series Factory 2. In fact, its now moved to where cylinder 1 and 3 have the most misfires with cylinder one leading with the most. Here’s a quick and easy test to determine what is causing your WRX’s fourth cylinder to misfire. 0L Turbo) Welcome to the North American Subaru Impreza Owners Club : Sunday November 26 Oct 28, 2010 · So here are the possible issues (read this first,then post about an issue if you have no resolution after trying said solutions): 1. Its not too bad through the gears but if you try to accelerate in a highish gear from say 2. 9 TDi + 1 more cylinder) and space is pretty tight. Apr 7, 2013 · Alright, I'll start out with some back story on the car. Anyways, today on my way into work, I give it the juice and it seems like it's missing under high throttle and/or high rpm. About 3 months ago my check engine light came on. Welcome to the North American Subaru Impreza Owners Club : Sunday July 9, 2023: Home: Forums Dec 16, 2014 · As luck would have it, this did NOT fix the problem. ugh, originally a P0302, now P0303 and P0301 New plugs, new fuel filter, swapped coils as follows: #2 to #1 #4 to #2 #1 to #4 #3 stayed put And, it's not just a code since the engine runs bad like a misfire. Aleksey: Factory 2. My Sti is setup for flex fuel and it’s tuned . As the title says, my 02 wrx recently developed a cylinder 3 misfire, only under heavy load, typically when boosting semi-hard in 3rd around 50 mph or so. 0L Turbo) Chronicles of a Misfire (1-4) 02 WRX - NASIOC Welcome to the North American Subaru Impreza Owners Club Jul 8, 2017 · However now this misfire is only happing on the Clark tune. It doesn't seem to do it at high acceleration-WOT instances but, I don't do that very oftne and, not sure I'd feel it and, it may take 50 runs to get it to happen. 8 5 speed. Jan 9, 2025 · Misfire at low rpms under load Causes of engine misfire under load Misfire at low rpms?: engine misfires at low rpms. 30. Scanner then said misfire on cylinders 1 and 3. It's in very good condition, but it has a misfire when it gets under a load. Clogged/dirty/bad injectors or fuel filter. I have no check enginelight. Weirdest part about it is the misfire seems to favour cyl 1 but I've seen the code on 2 and 3 but Oct 19, 2021 · I’m new to Subaru and I changed my spark plugs on my 13 wrx hatchback. 2B05 0x2B05 nitrogen oxide sensor, heating 29CD 0x29CD combustion misfire, cylinder 1 If I turn car off and back on EML light goes off and car runs fine, gentle acceleration doesn’t cause the issue and higher rev hard acceleration is also fine. The misfire occurs under load typically during any acceleration or going up hills and seems to happen through a whole tank of gas. Here is a list of mods: • VF22 Turbo • Walbro 255 fuel pump • Perrin short ram intake • Grimmspeed boost controller • Light weight flywheel • MRT Downpipe • MRT Cat Back Exhaust I am still in Looking for a little guidance on why I’m getting a p000 and p0300 cylinder misfire code. My 04 wrx missfires under boost in all gears, problem worsens in 2nd and 3rd gear. Aug 2, 2011 · OK, new plugs, swapped coil packs around, but now I have 2 misfire codes. Aug 8, 2005 · Chronicles of a Misfire (1-4) 02 WRX Factory 2. Unplugged p0031 & p0037. Sep 14, 2008 · Hey I just got a 02 wrx with 94000 mile. Replicates every time I put the car under load ~ high RPM. After changing them, idling and driving normal was fine. Oct 14, 2013 · Page 5- misfire under load no CEL 2002 wrx vf39 etc Service & Maintenance. Plus, if they reflash, they are gonna be disappointed to find I have killed 15 codes already associated with the aircut valves/airpump failure. The car itself may begin to run rough. Approximately 700-800 miles later another misfire this time on the other 2 cylinders. Under medium-heavy exceleration in first and second gear is when I have my problem. It indicates that your car’s second cylinder has a misfire. 5L Turbo Powertrain 02-18-2012, 12:39 PM 2005 WRX STi WRB. Again fuel pressure on AP maintains 1900+PSI Mod List: Feb 9, 2006 · I think I have an engine misfire, my motor wobbles pretty vigerously under a load. Usually between 6-6. I can misfire when cruising at this rpm and also when sitting "idle" in the garage holding the rpm at 2,500. It can be subtle feeling and isn't always loud either. My ECU was sent off and reprogrammed. 5L Turbo) 11: 02-01-2010 02:55 PM: Car breaking up/misfiring under load Dec 7, 2015 · I have a 2009 WRX, Stage 1 with some other minor mods, including DW65c fuel pump and TGV delete. My clues where new factory spec injectors, fuel pressure good, and still misfiring only under a heavy load with a tune. Cel like says missfire on #4. N54 misfire under load 02 wrx problems (HELP) Oct 7, 2012 · I have a 02 WRX wagon with about 115k on it that has been getting random misfires on all cylinders. There are many different problems that could cause your engine to misfire under load. Run a line from the catch can to the oil fill tube and vent to atmosphere with a small filter. Feb 3, 2017 · As the title says, my 02 wrx recently developed a cylinder 3 misfire, only under heavy load, typically when boosting semi-hard in 3rd around 50 mph or so. It would still have the misfire on cylinder 5 under load. Wrong, worn or incorrectly gapped spark plugs. The misfire is worse at 2,500rpms, specifically. Above that RPM, there's no noticeable loss in power either. Try changing the fuel filter. Sep 12, 2012 · Hi, my 2004 2. 0L Turbo) Chronicles of a Misfire (1-4) 02 WRX - NASIOC Welcome to the North American Subaru Impreza Owners Club May 3, 2019 · When the o2 is plugged in I get p0301-4 and p0037. The problem im having is at idle only or no load throttle. The car runs amazing under load so I don’t know what it is. And, they didn;t follow the original #2 packUgh. Typically happens after taking off from a stoplight but can also occur when shifting up or down. . Oct 28, 2010 · So here are the possible issues (read this first,then post about an issue if you have no resolution after trying said solutions): 1. Has some trouble starting every now and again. It runs fine and pulls alright when in The weird part is it only usually happens seemingly random and under full throttle (but sometimes it revs up fine. rotated the coilpacks, cleaned the maf sensor, cleaned the stock bcs, tightened all vacuum and boost clamps. Jan 1, 2015 · It will bog down and misfire/pop under 1/4-1/2 throttle, but only some of the time. Pushing in the clutch will make the problem go away for at least the next Jan 28, 2013 · Cylinder3 Misfire ok guys I have a real head scratcher here. May 11, 2008 · Inconsistant Missfire Under Boost Ive done an extensive amount of searching and have not found a similar problem. We have a Subaru Impreza in that is exhibiting an intermittent misfire only when the vehicle is hot and under load. The most common culprit is a problem with the ignition system. 5 k it is most apparent. It has a short ram intake and cone filter on it and what looks to be a catless downpipe but I am not sure. 0L Turbo Powertrain (EJ So, any help would be great, I’m kinda at a loss trying to diagnose this issue at the moment. It's a bone stock car as far as I can tell. Recent oil change, plugs, all the good stuff. Prolem seems to lessen after motor has ran for an extended time. Oct 4, 2015 · hello, i have 02 wrx with a studder under boost problem. Had the car looked over, changed out MAF plus new plugs installed. Sep 15, 2010 · I have an '02 WRX that misfires really bad under load. If I am in 3rd, 4th or 5th gear, it may rev up to 4,000 RPM at the most before it starts misfiring and stumbling. My car is a 2005 STI that is completely stock w/72K miles. Only modification has been an Accessport stage 1 93. Here’s a few things you can check:Plugs - how old? Gap & heat range correct?Fuel AFR - ar Oct 17, 2020 · In neutral it revs just fine, this happens only under load. Feb 21, 2022 · -No misfire on 2 which is odd…dealership was thinking ECU problems or possible timing problems which I have read on this form…only misfires around 4000-4500 rpm under load. Td06-20g, turbosmart 40mm ewg, protuned at 22psi on Cobb. The passenger side plugs (cyl 1 and 2? I think) looked great. Try wires, plugs, and lastly coils. throttle… i have an 02 wrx i have an 02 wrx that just recently started getting a flashing cel and codes for cylinders 1 and 4 misfire, and yes they do misfire all the time. Generally NGK work best gapped between . I figured my injectors were getting plugged up since my car sits a lot. Dec 2, 2018 · P0304 Fix: Subaru WRX. You are way over thinking this at idle you should be a 20in/hg. I switched the coils back and everything was back to “normal”. Nov 28, 2017 · Cylinder 1 will occasionally misfire when engaging the clutch(Car goes under load). Ever sense I got it it has sounded like it was skipping and just recently the check engine light has come on. 0L Turbo) 31: 10-07-2011 10:24 AM: Misfire under load: roqon33: Factory 2. 0L Turbo) 31: 10-07-2011 10:24 AM: CEL flashes under light load and goes away when load increases. The car has ~110k miles on it. I was idling in a parking lot at the time, and I could clearly tell (and hear) that the engine did not misfire. I have a random misfire code with my 350 vortec, otherwise it runs and idles fine. Jan 14, 2017 · 2002 WRX - Hesitation under load Hi all, First off, I have a 2002 WRX, bought a few months ago, 130k miles, came with the following mods on it: Turboback exhaust Junk cold air intake The first thing I did was replace the CAI with a stock intake, which fixed my "stalling after a hot start up" issue. I recently bought a 2008 WRX Hatch with 138k miles, which is throwing misfire codes on all cylinders, but not all at once. It was always cylinder 1. Once it hits high boost, the hesitation causes a "pop" like a backfire type of pop and noticeable loss of power (momentarily) which shows up as a small black cloud out of the pipe. May 10, 2014 · I have an 07 wrx with a grimmspeed ebcs, walbro 255, ACT streetlite flywheel, catless exhaust and a protune aside from a few other odds and ends. Nov 7, 2012 · It had a misfire on cylinder one. 2002 WRX Mar 14, 2020 · I had the CEL come on when accelerating: once checked, showed misfire to cylinder 3. I have an 05 STI (COBB AP, COBB SF Intake, Turbo-back exhaust) , had my plugs changed recently. the other day while entering the highway as soon as I passed 12psi of boost the car started bugging and the CEL started flashing. Aug 25, 2010 · The check engine light blinks, and throws 4 codes. The vehicle may produce excess vibration, especially at lower RPM. It doesn't throw a check engine light unless I stay in it and then it will come on and flash and then cut off. Feb 22, 2008 · I have a 2002 wrx with up-pipe, tbe, and a k&n typhoon, I was recently running the xpt stage 2 map but was having the misfire problems, I figured that I may have screwed something up with the reflash but decided to make the jump to the cobb ap. Im throwing misfire codes on all 4 cylinders and its rough at idle and hunts at part throttle with no load. The check engine code is: P0302 - 2nd cylinder misfire. Jun 15, 2022 · I’ve been having trouble with a misfire and hesitation under boost. Mar 3, 2023 · Misfiring is an annoying and dangerous problem for your car to have. WOT (100% throttle) - This misfire usually occurs in 3rd and sometimes 2nd near readline. At idle after warming up it would show some hesitation randomly then return to normal. The problem is, on a cold start, when my rpms drop cyl 2 starts going whacko with roughness. I put fuel injector cleaner through. The engine was warm by then and it only ran very rough but didn’t stall. 5L Turbo) 8: 02-20-2012 03:26 AM: Severe hesitation/misfire under loadHelp! 02blueru: Factory 2. Scooby Newbie . Feb 20, 2012 · Misfire at idle and 2,000rpm under load Factory 2. Drive it again under the same conditions. Jun 8, 2019 · The 02 WRX ECU can't properly read the lightened flywheel spinning down quicker than the 22lbs OEM flywheel. Anyone have any wisdom on the subject? Oct 14, 2021 · 2006 wrx misfires at idle only. I went in for a oil change and after that I was ready to start some 2nd gear pulls as soon as I hit boost my car started jerking back and forth and my engine light started flashing along with my traction control light. Swap Test. 030 Platinums -cleaned MAF -leak down compression test showed good pressure -Moved the coils between cyl1 and 3 and misfire stayed on cyl 1 -swapped out a 440cc injector for another stock one Still misfire on cyl 1 only under Mar 20, 2012 · Terrible misfire under load 2002 Stg 2 WRX (BC Racing coilovers, Godspeed TMIC, uppipe and turbo-back 3" Prodrive exhaust) 10/14/12 - 03-22-2012 at 02:54 PM Feb 6, 2011 · Hello everyone. very odd. Aug 3, 2018 · 2008 WRX Hatch - Misfires Under Load Factory 2. I also cleaned out the purge valve. It is a 2002 WRX wagon Automatic transmission that I bought about 4 months ago from a used car dealer. Most of the time it'll take off normally, accelerate like a champ. It starts fine, idles fine and generally runs fine except when under load, its worse with the aircon on, but still noticeable when its off. The symptoms are that it basically misfires at idle, but when you bring up the RPM to above 2000, it completely smoothens out and runs fine. Apr 26, 2012 · You are getting a misfire because of the vac leak. I'm about to change out upper and lower intake manifold gaskets, update the fuel spider system, new cap and rotor, wires, crank and camshaft position sensors, and fuel filter. Nov 19, 2018 · WRX P0301 OBDII Code Symptoms. I took it to the dealership and they had no idea. I immediately assumed it was a misfire as the car was due for a tune-up. Feb 19, 2015 · 02 WRX CEL flashing, hesitation/rough run under load! I have a 2002 WRX with 278XXX kilometres and last Friday, the CEL started flashing while the wife was driving. P0037 pertains to rear sensor, which has been defeated in tune, however will reappear when there are other codes thrown. Since the only definite way to diagnose this is with an oscilloscope, which few people have including mechanics, replacing old worn out parts is usually the easiest fix. I feels like the rev limiter hits at 4-5k rpm. 030". When I start up a hill or just push the pedal to the floor it has an occasional miss. the codes aren’t bias so it happens whether on e85 or 93 octane. If the misfire follows the coil swap get new coils. Am I paranoid about my slight overboost, or did I potentially blow out the head gasket(s) by a mere 23 psi? Or… did all my testing foul out one of the plugs to the point where it no longer provides a big enough spark to ignite the gas under heavy load? Jan 17, 2014 · Original issue: Car would take 2-3 seconds to start and had thrown p0301-04 (misfire on all 4 cylinders) prior to all maintenance but never felt like there were actual misfires. If it's bad enough to cause your WRX's check engine light to come on, you shouldn't drive your car at Apr 29, 2008 · All Activity; Home ; Newer Generations of Subaru discussion ; 1990 to Present Legacy, Impreza, Outback, Forester, Baja, WRX&WrxSTI, SVX ; 1996 ej20 legacy, misfire under load but only under 2000rpm and with full throttle Feb 29, 2012 · Hi guys, I'm Hoping at least some of you still keep up with this thread. cel. stop and park. I took it to the dealership and the diagnosis was a known software problem. SO thought it might be coils, so switched with other side to see if it would come up as 2 and 4. Swap coil 3 with 4 and test. Misfire under load (solved) Engine misfire at low rpm (causes & fixes) Engine misfire at low rpm (causes & fixes) Can piston rings cause misfire at brian moreno blog May 15, 2021 · Greetings everyone! New here, and to the Subaru brand. Apr 6, 2022 · I get random hesitation, subtle as the rpms climb, which gets worse when under heavy load/boost (past 20 psi). It did throw a CEL for a misfire on all 4 cylinders. One time I drive the car it will throw P0301 and the next time I drive it, it will be P0304 or P0303 for example. I have an 02 wrx, stock ej205. this would normally suggest a coil/plug issue but they all check out. 5xt has developed an annoying misfire / surging when under load. 44 gearing out of a JDM forrester cross sport. I replaced all the plugs with OEM NGK's. It doesn’t happen all the time but it happened about 4 times while my fuel levels were low. 5L Turbo) 08-01-2018, 09:02 PM #1: Hungover_cat. Initially had some CEL’s, misfire 1 and 2 and knock sensor P0327, we changed plugs, coils, knock sensor, MAF sensor, air and fuel filter, didnt fix problem. I have run multiple times with a Cobb Stage 2+ and a ETS Tune as well and have not had ANY misfires on any cylinders during pulls/high boost. Sluggish at low rpm(<2000). 1. I have a 2011 STI that I bought recently (as a project) with a misfire on cyl 1. Buttoned everything back up, battery, washer tank, etc. 06+ has a redesigned fill tube that vents to the service ports on the housings so they don't need a catch can. Jan 27, 2018 · All Activity; Home ; Newer Generations of Subaru discussion ; 1990 to Present Legacy, Impreza, Outback, Forester, Baja, WRX&WrxSTI, SVX ; bucking below 2000 rpms under load On an 04/05 remove the vacuum line going from the intake to the oil fill tube and cap the port on the intake tube. Both driver side were somewhat fouled. 0L Turbo Powertrain (EJ Series Factory 2. P0302 is a real drivability concern and should be dealt with right away. 2008 Impreza 2. Nov 28, 2018 · P0302 in the Subaru WRX is a common OBD II trouble code. I know you are sick of seeing the obligatory noob nooberstein misfire post, but I have read the sticky and am on my way to exhausting the list. I am going to scan my car to see if there are any codes later. No codes in the system and idles fine. Recently picked up this 2002 wrx wagon as a project. Pressure test the system, find the leak and bam problem solved. Apr 4, 2010 · So i have a 96 with 170,000 on it, last weekend i replaced the head gaskets, timing belt, water pump, spark plugs it drove wonderfully for a hundred miles then started chugging and pinging under load idles perfectly though fires up on first crank runs perfect till engine heats to Oct 20, 2009 · Severe hesitation/misfire under loadHelp! 02blueru: Factory 2. No check engine light although there was a misfire on cylinder 4 code that hasn't come back. Misfire at Low RPMs Under Load | Tacoma World. That is not enough voltage to jump the spark plug gap and ignite the fuel/air mixture. I ran the codes today and got as follows: P0302 Cylinder 2 misfire detected P0303 Cylinder 3 misfire detected P0304 Cylinder 4 misfire detected and P0128 Thermostat malfunction Aug 11, 2011 · I just bought a '02 Mustang 3. Us Mar 16, 2011 · 02 wrx #2 misfire help Factory 2. All fuel and ignition has been replaced… Mar 6, 2015 · Re: Misfire under load Post by MeanTdi » Wed May 06, 2015 1:27 pm 4ePikanini wrote: I have swapped the loom on my longitudinal R5 - (1. -Changed the plugs, br6 ngks gapped . Nov 3, 2006 · However, driving conservatively has no misfire and motor purrs along just fine. My code cleared for cylinder one. We have boost gauges for a reason. May 2, 2018 · I just recently purchased a 2003 Subaru wrx about a month the ago. its under a load i smell raw gas. so far ive replaced all new ngk iridium sparkplugs gapped to . I always put in premium and try to hit up name brand gas in up scale areas Oct 13, 2012 · Misfire at idle and 2,000rpm under load: liljons06STI: Factory 2. This only happens under heavy acceleration, my car shutters once it moves up into the higher RPMs. I noticed it idles just a little rough. I have a MY 02 wrx with 136,000 miles. Look at the diagram under "Engine Data Sensors - Pressure, Temperature, and Throttle Controls". Now, the thing does not want to idle and is missing under normal load. 5k rpm. wfofromthegetgo: Transmission (AT/MT) & Driveline: 0: 04-07-2006 05:37 PM: FYI: Pedal vibration under load information: akira02rex: Factory 2. Jan 11, 2012 · Since then I have had code P0420 (inefficient cat) thrown a couple of times. It depends on how serious the misfire is. I have an intermittent misfire when taking off from a standstill. my car runs better thats for sure! however when it gets up to Jul 30, 2022 · Hi all, I am basically done with swapping a 1996 EJ22 into my 1987 Subaru RX. I've been experiencing a misfire (or 2) but haven't been able to fix them due to being away at school and having no where to work on my car. the sound can best be described as "sounds like a wrx". 1,2,3 and 4 cylinders misfire code. May 12, 2009 · It was about 5k miles until the first misfire codes. It doesn't seem to likely be the culprit but I will describe the symptoms: Idle drops to 300-400 RPMs, catches itself before dying, jumps up Aug 8, 2010 · 2002 subaru impreza wrx CEL came on and has been idling rough for a couple weeks. 2. If you have multiple codes with P0304, jump down a section. When I bought it she had a misfire cyl 4 OBD 2 code, as well as a Cat Efficiency code. Feb 5, 2009 · I had a CEL for misfires on cylinders 1, 3, and 4 on my 2002 WRX years ago (while it was still under warranty). Doesnt register as high (only ever saw up to 6 misfire counts on cylinder 3) or buck or pop out the exhaust as much as the partial throttle instances. Issue Details 1st occurrence – cyl 1 and cyl 3 while cruising on the freeway: no engine stutter, hesitation or difference in feel/noise Changed plugs, Reset the ECU – car ran the same; perfectly fine. The P0301 trouble code will trigger your WRX’s check engine light. The car is fine until it warms up and then it starts misfiring like crazy and the cylinder roughness goes up to like 75 sometimes and sometimes I’m at a light and it doesn’t misfire whatsoever but sometimes it idles so it’s super random. The dealership says they need to take the motor out to Apr 20, 2019 · Hey all, before I get flamed for asking WhAtS wRoNG wItH mY cAr, ive tried reading so many pages and threads and different websites, everybodies different solution to their issue and personally nothing seems to work. Once I saw that the injectors where damn near being held open (thanks to you), it really made it seem like OP could benefit from larger injectors & fuel starvation is the problem. ) When it misfires I get an EPC light on the dash and code for misfire on whichever cylinder it detects and a "hide cylinder" code. Aug 27, 2009 · Are you saying that you know you have a bad front o2? Just haven't got around to replacing it yet? Nov 30, 2013 · I have a 2002 WRX 5mt Cobb stage 2 with an eBay cat back, invidia Catless down pipe, a mishimoto radiator, and just the stage 2 flash. Under load the car ran great (from feeling). I started getting a misfire a few months back. TP stage 2 tune. Then 1 and 2 and test. yam xntap vvfip pubv tata gcrkmjzv lvsynf opqt lzfqauk edvbt lixken cwvi zzd xjt tdwcp