I have a 2010 Subaru Forester that will start fine during the spring-fall months when it’s 40+ degrees outside. Once the weather is about 35 degrees or colder, the car will not start.
I also see a pattern where I’m more likely to get it started (after MANY attempts) in cold, but dry climates (Colorado) whereas I have almost NO hope in cold, damp climates (Wisconsin).
It is turning over, but will not start. The battery sounds healthy for the first few minutes of me trying to start my car, but will eventually start sounding sluggish after awhile.
The car did this last winter (in Colorado, so milder winters), but I could usually get it started once the sun came out and warmed my car up. Now, in Wisconsin (nights are getting VERY cold), it just absolutely will not start. I once got it to start by pushing it into a garage, closing the door and running multiple space heaters. After a few hours, it started.
If it DOES start, it will not repeat the problem again that day.
I’ve gotten my battery tested by 3 different shops, and all of them say the battery is completely fine (battery is less than 1 year old). I have tried trickle chargers and jump-start chargers; neither have worked to get it started. I did have quite a bit of green corrosion on the battery after a long road trip (2000 miles) once, but I completely cleaned the terminals. Recently, I cut the rubber around the battery cables, just below the terminals, and noticed that there is corrosion on the wires.
The alternator was tested, and fine.
ALL my spark plugs and spark plug wires were replaced within the last 1-1.5 years.
I can hear the fuel pump kick in when the key is turned, and I have no other symptoms of a bad fuel pump (I’ve tried someone banging on the gas tank with a rubber mallet while trying to start it; leaving the key in ACC for a few seconds before starting; adding fuel injector cleaner in the gas tank when I can actually get it started; added Heet to gas tank; none of it helped at all).
I am leaning towards there being a weak connection because of the corroded battery cables, but I’d love a second opinion. I’m afraid to take it to a mechanic, because I don’t want them to replace the fuel pump just to find out it wasn’t the fuel pump…
Thank you for any advice!!