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  1. General Troubleshooting and Technical Help
    Hey everyone, looking for some guidance or better yet someone who’s encountered this issue before. I daily an 04 Forster with an ej251 and an auto trans. If I’m cruising around 40-50 mph and the trans has to downshift from 4 to 3rd, the car will lose power and shudder. I originally thought that...
  2. EJ25 - 2.5L Non-Turbo (1998-2010)
    Went on a trip last week, about 250 miles there & back. Changed the oil right before I left. Topping it up a little bit the last time, I lazily opted to not use a funnel, and very predictably spilled oil all over the camshaft position sensor and it's plug. The oil fill is directly above this...
  3. FB25 - 2.5L Non-Turbo (2011- 2018)
    I have a 2012 Forester with the FB25 NA engine. I'm getting a very sporadic P301 and P302 codes when accelerating at highway speeds, clear the code and it goes away, drive another 1000km and it might come back again. I was going to check the coil packs first to make sure that they're still good...
  4. EJ25 - 2.5L Turbocharged (2004-2013)
    Recently I made a thread about a cylinder misfire and trying to locate the coil for cylinder 4. I've been getting error code p0304 for a while now and only recently has the cylinder been actually misfiring. Before it would bring up the code but I wouldn't actually feel the misfire as it wasn't...
  5. EJ25 - 2.5L Turbocharged (2004-2013)
    I have a misfire on cylinder 4 and im pretty sure its the coil, but unlike 1 and 3 (on the left side when facing car from front), i cannot seem to find the coil. Either its hard to see or its somewhere im not looking. If anyone has the same model, can you please attach a photo highlighting the...
  6. General Troubleshooting and Technical Help
    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...
  7. General Troubleshooting and Technical Help
    2007 Forester X. Bone stock. 154k miles. I bought the car in November, it is not july and it's dead. I had a no start issue in the winter and i solved that by replacing all my grounds, battery, alternator, spark distributor, spark wires, spark plugs. Things were good for a while then it started...
  8. General Troubleshooting and Technical Help
    As title say, does the 2011 Forester XT shut off fuel injection to the cylinder when misfire is detected? I've got a p0304 code and I think it's the spark plug but in order to check, I need tools that are 120km away at home, which I plan on going to tomorrow. I just want to know this because I...
  9. General Troubleshooting and Technical Help
    This is on a 2015 Subaru Forester. My sister plugged in a connector into the OBD2 connector to get supposedly better fuel mileage. Once she started to drive it came up with an ABS issue, a misfire issue and a transmission failure issue. Does anyone have a clue as to what this device has done?
  10. EJ25 - 2.5L Turbocharged (2004-2013)
    Hey all, my 04 Forester let me down Christmas Day, of all days with a terrible misfire. I was able to limp the old girl home and get some well needed maintenance done. Plugs and coils all around and she was back on all 4! Noticed the timing belt was in dire need of replacement. Done and done...
  11. General Troubleshooting and Technical Help
    Hoping to post here and get some ideas as to what is wrong with my forester. I love the car but we have been chasing a grimlin trying to find what is causing the problems… Sometimes has rough idle, also sometimes doesn’t want to start, when fully pinned the engine jolts and stutters under...
  12. Motor Conversions
    Hello all, I have nearly completed an engine swap from an 11 to a 15. Bought a 15 from a legacy. I’m having an issue with my mass airflow sensor. I have replaced it and symptoms continue. When starting the car it starts but dies immediately. That does not happen if the MFS is unplugged. I get...
  13. EJ25 - 2.5L Turbocharged (2004-2013)
    Hello y’all, My 2004 Forester XT started having issues right after I changed my fuel pump and fuel filter. Before that my gas mileage wasn’t great and my fuel pressure would cut out open throttle. My car also reached over 200k miles so I figured changing the pump might be a good option. I...
  14. General Troubleshooting and Technical Help
    Hi everyone, It has been a while but now I need some advice. I am on a road trip for research my Masters when things started going wrong. I drive a 1998 Subaru Forester S auto (Dohc) with 200,900 miles as of writing this. Before leaving I checked my oil and it was at the L, I added a bit to get...
  15. EJ25 - 2.5L Non-Turbo (1998-2010)
    Hey guys, I'm getting a randomly occurring misfire CEL in my 99, but I'm pretty convinced it's not actually misfiring. A few weeks ago it threw a P0301, single cylinder 1 misfire. I pulled the plug and it looked totally brand new still. Now about every hour or 2 of driving it throws misfires...
  16. General Troubleshooting and Technical Help
    Hi there! New to the community but glad to be here. I own a 2017 forester 2.5 with 53,000. I'm the second owner. The car has been well maintained (since I got it, 15k ago). I took the car cross country this summer, and noticed worse gas mileage that normal, toward the end of my trip. I also...
  17. EJ25 - 2.5L Non-Turbo (1998-2010)
    Hello all, I have an 04 Forester XS (174k) that for the past year and a half has been a nightmare trying to get to run correctly. Since late summer of last year, I've been having issues (somewhat worse as time has gone on + REALLY bad in the winter) with a feeling of bucking/surging under heavy...
  18. EJ25 - 2.5L Non-Turbo (1998-2010)
    I’ve been having some issues with my 2009 Forester….165k miles. Threw codes for misfire cylinders 2 & 3 and the P0420. Replaced plug wires, coil pack, and spark plugs. Found oil on the plugs and a small leak around the valve cover so I have new gaskets/and tube seals on the way. In the...
  19. EJ25 - 2.5L Non-Turbo (1998-2010)
    Hey Everyone, So I purchased a 2010 Forester N/A last fall and at the time of purchase the previous owner said it needed a new O2 sensor, specifically the back one. Based on what I could gather and checking the code he seemed correct so I installed it and reset the code. This particular...
  20. General Troubleshooting and Technical Help
    1999 Forester S 200,000 miles ej25. First Subaru. Car drives fine but idles terrible. Shaking misfire idle. I’ve been chasing the misfire for a bit now. CEL will say p0304. Compression test comes back 60ish psi. Leak down test has air leaking from exhaust. Timing is perfect. Belt is newish. So...
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