2011 Subaru Forester [FB25/EJ25 series boxer engine]— 151k miles — sudden stall after hard acceleration, now impossible to reproduce
I’ve owned this Forester for a little over 2 years and put ~22k miles on it. It has always been reliable. No major issues at all… until Friday night, when it mysteriously broke down and stranded me.
I know very little about cars, but I’m trying to learn. This situation has stumped at least one mechanic so far.
What happened
I was about 100 miles into a highway trip. A construction vehicle suddenly swung into the left lane, forcing everyone to slam on their brakes. After that, I accelerated hard to get back up to speed.
Whenever I accelerate hard on the highway, I notice bluish/grayish smoke from the exhaust. My car burns oil — I’ve been told this is common for older Subarus — so I regularly top it off. I had topped it off right before this trip.
About 2–5 minutes after the hard braking + hard acceleration, I exited the highway to stop at a rest area. I slowed down normally, turned into a parking spot, and then everything happened at once:
- Check engine light came on
- Oil light came on
- Multiple warning lights lit up
- Engine was still running but lost power
- I think I lost power steering
I shut the car off (not sure if that was a mistake). After that, it would not start. It cranked strongly, maybe sputtered a little, but never came close to firing.
What happened next
I waited 3 hours for a tow truck. I tried starting it right before the tow arrived — still dead. My friend (who knows more about cars than I do) came to pick me up and confirmed I wasn’t missing something obvious.
Gas tank was over half full. Roads were dry.
The mechanic looked at it Monday morning… and it worked perfectly. He drove it for 15–20 minutes, let it idle for 1.5 hours, scanned it, checked everything. No codes. No symptoms. No clues.
He said he had no solid idea what caused the stall.
I drove it 100 miles home today with no issues, but I kept it under 60 mph.
My situation now
My local mechanic is checking it Wednesday. I’m worried he won’t find anything either.
I’m supposed to drive this car 1,000+ miles next weekend to move out to college. I’d really like to identify the cause and fix it if possible. I’m willing to spend some money on preventative repairs even if they’re not strictly necessary.
I just want to avoid this happening again on a long trip — especially somewhere remote, where it would be a lot worse than missing the Tigers–Dodgers game we had $160 tickets for.
Any ideas are appreciated. Don't be too mean to me, and yes Ai edited what my story to make it sound better but it didn't add anything.