Wondering if anyone can help me out regarding a slow tire air leak I've been
experiencing for the past month or so on the rear driver's side tire of my 2015
Subaru Forester. I began to notice it when the low pressure light would come
on, and by trial and error (aka filling one tire at a time and driving around to
see if it made the sensor shut off) I determined it was the rear driver's side
tire. The low pressure light would come on about every 3-4 days when it would
lose approximately 5 psi (went from the recommended 29psi fill to around 24psi).
A friend and I looked at it and saw no visible holes in the tire. Since the
low pressure light would go off when I refilled the tire every time, I'm
assuming it's not a TPMS problem. My friend then recommended that we replace
the valve stem core, and that's what we did. After the valve stem core
replacement, the tire still loses air pressure, but it goes from needing to be
inflated every 3-4 days, to now lasting a week (7 whole days) between refills.
I made a tentative appointment with the dealership to get it checked out because
I'm getting a little concerned that letting this go for so long might compromise
the tire in some way, and I don't want to be negligent, but I'm second-guessing
Since the replacement of the valve stem core, the time between refills got
longer, so it seems to make sense that the problem has something to do with the
valve stem. Thinking back, I remember my friend loosened it and tightened it
(he wanted to make sure he didn't overtighten the new core) when he did the
replacement, so I'm wondering if it simply needs to be tightened a little bit?
Again, I do want to take care of this problem, but I also don't want to spend
what will most likely be a couple hundred dollars at the dealership if I can
Does anyone have any experience with this kind of thing? Am I most likely
correct in thinking it's still a valve stem issue, or are there other likely
possibilties (barring a tiny pinhole leak in the tire that I'm unable to see
with the naked eye, of course)? Thanks for any advice!