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  1. 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...
  2. 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...
  3. 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...
  4. 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...
  5. 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...
  6. 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...
  7. 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...
  8. 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...
  9. 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...
  10. General Troubleshooting and Technical Help
    Hey guys, I've had one problem after another on a 2003 subaru forester just got the power steering fixed and think it's possible sum oil may have gotten in plug 3, but cylinder 1 is fine, the closest to the power steering reservoir, and 2 and 4 wouldn't have gotten any power steering fluid in...
  11. FB25 - 2.5L Non-Turbo (2011- 2018)
    Hi all, I recently purchased a 2013 Forester and after about 600 miles of driving I got a check engine light for cylinder 4 misfiring. The light came on after a hard acceleration / high RPMs. Steps taken so far: Swapped the coil packs and no changes to the codes I tried to clear the codes...
  12. FA20DIT - 2.0L Direct-Injection/Turbo (2014-2018)
    SO I've been dealing with this P0300 for 2 summers on my '14 FXT. Along with the code came hesitation/jitters on acceleration and not the smoothest idling. Still very drivable, but it's in limp mode almost always now. Last season I found a post on the FXTfacebook saying a MAF sensor cleaning...
  13. Lighting and Electrical
    So my forester for the past couple weeks has been misfiring at idle with no CE light. At first, I thought it was because I skipped a carbon cleaning (I do a crc turbo treatment every other oil change) as it has the same symptoms of excess carbon. But it recently has gotten so bad where it...
  14. FB25 - 2.5L Non-Turbo (2011- 2018)
    Hello -- started getting the P0302 code for a misfire in cylinder 2 & it idles very rough. FB25 non-turbo engine has ~150k miles on it so I did the following work: Replaced both valve cover gaskets (went to replace the spark plugs and noticed that there was oil in the tubes) 4 new NGK spark...
  15. EJ25 - 2.5L Turbocharged (2004-2013)
    SOOOO, i bought this forester Xt. 2004. I knew it would be a project. But, it’s one thing after another. My Oem turbo inlet was ripped so i purchased a Tomei turbo inlet. It was a pain in the butt install. But it’s in. I did a smoke test at work, i work at Nissan. It hold pressure. But now, i...
  16. EJ25 - 2.5L Non-Turbo (1998-2010)
    Hello Forester community! I have a 2002 manual forester, and I have had issues with a cylinder 3 misfire multiple times now. Each time the spark plug is very fouled and needs replaced, and this seems to happen every 10,000 miles, however this most recent time it only took ~1,000, leading me to...
  17. Engine Management, Tuning and Datalogging
    Hey everybody. I finally got my car on the road and am in the process of E-tuning. We got it running pretty good and decided to start adding ethanol into the mix, car has flexfuel. At E35 I have an aggressive hesitation in 1st and 2nd gear as boost comes on or once in boost. Tuner thinks it is...
  18. General Troubleshooting and Technical Help
    I'm going to preface this with some info before I explain the issue. 06 Forester xt Turbosmart ultrasonic bov Sti tmic Catless up and down pipe Cobb 4 bar map Cobb intake and turbo inlet It had a tune before I owned the vehicle but accessport was unmarried the day I signed the title. (accessport...
  19. General Troubleshooting and Technical Help
    Greetings, all! I recently bought a 2008 Forester, non-turbo, AT, and have been addressing some common issues that people seem to have with high mileage Subes. Car has 244,500 miles on it. The engine starts well, and after driving a few minutes, the CEL illuminates and I have P0303 code for...
  20. General Troubleshooting and Technical Help
    I have a 2009 2.5x auto forester with 170k miles. A week ago I got a p0028 code for the bank on the left side. Fixed the oil level then the code went away. But now reaptedly I am getting a P0303 code for cylinder 3 misfiring. So far I have changed the coil pack, spark plug, and spark plug wires...
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