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  1. General Maintenance, Troubleshooting & Accidents.
    This is a 2015 WRX turbo, 2.0 liter, base, no mods. It has only 28,500 miles on it and never had a problem. I bought it new. Out of the blue I got a CEL, code P0304 (cylinder 4 misfire). It is exhibiting rough idle, lack of power, strong smell of gas from exhaust. I replaced the plugs, swapped...
  2. Engine Modifications
    Log time lurker, first time poster to this excellent establishment. I’ve been chasing this ghost for 2 years now and I humbly seek the wisdom homed here. Basically, I have a persistent misfire/ hesitation/ stumbling issue with my 2013 WRX hatch that I have not been able to beat. Parts, mods, and...
  3. General Maintenance, Troubleshooting & Accidents.
    So my 04 wrx developed a misfire about a few months ago and I stopped driving it because of that. I did some looking into it and I swapped the plugs and coil packs. Didn’t fix it. Then I did a compression test and got 60 psi back for cylinder 2. Timing marks seem to line up. 2 at each other and...
  4. Maintenance, service, and repair
    Any one have any ideas as to whats causing this misfire? I have an EJ25 thats big turbo wit supporting mods, I've changed spark plugs, ignition coils, removed the 1400cc injectors and cleaned them, and even moved them around to different cylinders. The misfire happens at idle, but isnt...
  5. Maintenance, service, and repair
    Hello, I’ve been having troubles with my subie for about a month now, the problem is when I start the car cylinder roughness on 2 skyrockets and it’s only this cylinder as well. All other cylinders keep roughness at around 2 MAX however, cylinder 2 has roughness that has climbed as high as 100...
  6. General Maintenance, Troubleshooting & Accidents.
    Long story short I have a 02 wrx Ej205 JDM swap non AVCS Invidia downpipe K&N intake Boost gauge Stage 2 clutch CEL for p1507 Changed the iacv and checked it was working. also cleaned it Checked for vacuum leaks, only a very minor one at intake manifold Oil leak from oil return line Car...
  7. General Maintenance, Troubleshooting & Accidents.
    Hello everyone! I have a 2005 WRX that is swapped with a JDM EJ207 v8 with the JDM ECU. Haven't driven it in a while, but I decided it time to get it back alive and get it a new tune. Currently doing an e-tune, and on WOTs I get severe spark blowout (loss of power/misfires) at high boost around...
  8. General Maintenance, Troubleshooting & Accidents.
    I've been fighting with a gross misfire and bad studder at about 3500- 4500rmp for at least a month now. Car is a 2004 wrx wagon. Mods Person I got it from said it's a jdm swap No name turbo back exhaust Catless down pipe Rev 9 turbo inlet Wabro 255lph fuel pump After market intake not sure on...
  9. Transmission & AWD
    2012 WRX, no mods besides an exhaust, stock tune, 217k miles I experienced some very strange behavior in the snow this morning. I would just be cruising along at a constant speed, and the car would randomly buck. It's as if the engine misfired. No check engine light came on, but it was...
  10. General Maintenance, Troubleshooting & Accidents.
    2012 WRX, no mods besides an exhaust, stock tune, 217k miles I experienced some very strange behavior in the snow this morning. I would just be cruising along at a constant speed, and the car would randomly buck. It's as if the engine misfired. No check engine light came on, but it was...
  11. General Maintenance, Troubleshooting & Accidents.
    2014 STI 6spd USDM Mods: IAG stage 1 short block (roughly 24k on new shortblock, stock heads one head casting was replaced when engine blew up) Excedy Stage 1 clutch Gates timing belt kit grimmspeed head gaskets grimmspeed 3in catted divorced downpipe 3in straight pipe from cat DW300c Fuel...
  12. General Maintenance, Troubleshooting & Accidents.
    My 2017 sti is bone stock and my daily driver. Recently at about 65k miles i noticed stuttering and jerking at WOT above 4.5k rpm. I then replaced my spark plugs with oem NGK plugs (my old plugs turned white instead of black) and that didnt help. During the hesitation the check engine light...
  13. General Maintenance, Troubleshooting & Accidents.
    Hey guys, ive been prowling these forms forever, and although nearly every question ive ever had has been answered here, or somewhere online, i have a unique situation that i need assistance with. I have a 1996 GC8 WRX with a recently swapped 1996 EJ20g on a U8 ecu. Car is stock other than a...
  14. General Maintenance, Troubleshooting & Accidents.
    2006 wrx misfires at idle only. 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 car runs amazing under...
  15. Engine Modifications
    Found out my car was running lean about week ago My buddy hooked his obd reader up to it and it read about 11afr from idle to any rpm. Rented a fuel pressure test kit from oreillys, pressure came in at 43 psi priming it then holds steady at idle, under load the pressure stays the same all the...
  16. Tuning: Electronic Engine Management
    Foreword: I don't have a WRX but NASIOC has to approve my thread and UltimateSubaru has to approve my account, which I'm still waiting on, so I was hoping to possibly get some help here. I also thought it would be better to post here instead of the "General Maintenance, Troubleshooting" subforum...
  17. Engine Performance
    Ok y’all I have an 03 bugeye I bought late last June, I just rolled over to 150k last week. Interestingly enough within 2 days of said milestone, I was driving on the highway and got a horrible engine shudder and blinking CEL. I diagnosed the issue and have since then tried 2 different sets of...
  18. General Maintenance, Troubleshooting & Accidents.
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  19. Maintenance, service, and repair
    I have owned this car for 3 years now, its has 65k miles now. Around 60k I started to notice a rough idle no check engine at this point take it down to Temcula Subaru/Mazda because I received a recall for the exhaust system. I had them do I diagnostics and came back that the ground electrode has...
  20. General Maintenance, Troubleshooting & Accidents.
    Hey Guys, new guy here! I apologize in advance if I am somehow posting this in the wrong spot. I just joined today and was hoping for a little bit of help or insight. I daily drive my WRX and have kept up with all maintenance and have babied the thing for a while now. I have done minor...
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