Subaru Forester Owners Forum banner

1 - 2 of 2 Posts

·
Registered
Joined
·
5 Posts
Discussion Starter · #1 ·
Hello all, back again for the folks that know more about subies than I do.

In the last few months my '13 Forester XL has thrown me for a loop. It began in the winter throwing p0420, figuring my O2 sensor was the suspect I changed it out with a OE Denso and everything seemed fine. A week later it began lunging and pulsing terribly while under normal driving conditions(for me is mostly mountain 45/55 and some highway 60/70mph). Now it runs terribly, cleaned my MAF every oil change, makes no difference. Fuel consumption has gotten ridiculous I only average 13ish mpg, car shuts off at stop lights/signs, but I've noticed pumping brakes can help keep it stuttering long enough to tap accelerator a few times and keep it running. When I start it up in the mornings 80% of the time of I leave it to "warm up" in a couple minutes when I come back out it's shut off, each trying as of you simply turned the key off. I'm speculating but it seems to have a serious fuel/air mixture issue.

I've thought that possibly sure to the original engine burning so much oil my cat is stopped up ( dealer swapped short block about 50k miles ago). I tried getting the dealer to replace cat and both OF sensors due to pull consumption but they tell me it's not covered. I'm at a loss here, has anyone ever dealt with this or something similar? Thank y'all for your time in advanced.

Hunter
 

·
Registered
2017 Forester 2.5i CVT
Joined
·
193 Posts
Some suggestions you can try. Have you inspected your belts? The new EPDM belts don't crack, but the belt gets thinner and the grooves worn and wider until it could be slipping but without squealing much. This can cause stalling as your alternator flow is weakened. I changed mine at 94000 miles and was shocked when my headlights got brighter and my gas mileage went up. But mine is a single Serpentine, I think your car has two...
Sometimes partly clogged CATS can be freed up by a high percentage PEA fuel system cleaner, I prefer CRC Guaranteed to Pass as costing half what Cataclean does, but try either one put in right before filling a near empty tank, run down to 1/8 tank next.
Lastly get a decent moderately priced scanner in the $50 to $100 range and see what it tells you, you may for example detect misfiring not severe enough to trigger a check engine light but compromising performance. My Ancel 410 is cheap, but it tells me a whole lot of usefull things. Good luck and let us know.
 
1 - 2 of 2 Posts
Top