06 Forester 2.5 210,000 mile club, 01 Outback 2.5 182,000 mile club
Hi. Its been a long time since I posted a message about my Subaru Outback but I have a problem and am just looking for a little direction. Last week I was driving in the rain, running just fine. I started up a mountain at 55 MPH and just started losing power. I gave it gas, it downshifted and I could feel a noticeable vibration coming from the engine. The CEL was blinking. I limped it home and it kept stalling every time I lifted off of the accelerator. That night read the code, #4 cylinder misfire. I figured it was an easy fix so I popped a new plug in it, started it and it would sputter and die. Not so easy of a fix after all. I replaced all of the plugs the next day, started it and this time it would stay running but the idle is surging between 1000-2000 RPM...exhaust smells extremely rich, kinda feels like there may still be a miss. I let it run for a few minutes, backed in and out of the garage...no CEL. I started reading threads on here and found a few that suggested disconnecting the upstream O2 sensor (I read they go bad and sometimes cause my symptoms without a CEL). So I did that...started it and I have same problems and surprisingly no CEL even though the O2 sensor was disconnected. I didn't let it run long because of the rich gas fumes coming from the tailpipe. I don't want to damage my Cat because it was replaced 2 years ago. I am not sure what direction to go with this. I hate just changing parts...just looking for some advice on which way to troubleshoot. Plugs are NGK, brand new, wires are 1 year old, coil 2 years old...engine was rebuilt in 2016 and has been great ever since. Thanks for your help!