From: bashley101@gmail.com   
      
   On 7/24/22 8:09 PM, Xeno wrote:   
   > On 25/7/2022 10:59 am, The Real Bev wrote:   
   >> On 7/24/22 5:45 PM, Paul in Houston TX wrote:   
   >>> The Real Bev wrote:   
   >>>> 2013 Corolla S with the original wheels, tires and pressure sensors.    
   >>>> There are only 33K miles on the tires and the tread is just fine.Ever    
   >>>> since I've had it (2016) a single tire loses air very slowly -- it    
   >>>> used to go from 32 (or 35, I'm not real picky) down to maybe 24, and    
   >>>> the light would come on.  A month or so later the same thing    
   >>>> happened.  Time between lights is now between one and two weeks.   
   >>>>   
   >>>> Dealer said he couldn't see a problem.  (I have no actual proof that    
   >>>> he actually looked.)  I have a nice plug-in tire pump (the $35 one    
   >>>> from Harbor Freight;  the cheaper one burned up rather quickly when I    
   >>>> tried to pump all four tires) so there's no real problem, and I'm    
   >>>> unwilling to load the tire up with slime, but I'd really like to know    
   >>>> WTF is happening.  Sooner or later I'm going to need new tires and it    
   >>>> would be nice to know if I need a new pressure sensor too.   
   >>>>   
   >>>> BTW, I really like the tires (Goodyear Eagle RS-A) -- excellent    
   >>>> cornering on the road I take to go skiing.  People really need to be    
   >>>> ashamed when they get passed by a granny in a 9-YO Corolla!   
   >>>   
   >>> If the manual tire gauge agrees with the pressure sensor then the   
   >>> pressure sensor is ok.    
   >>    
   >> The red light just says I NEED AIR.  The gauge on the pump and on my    
   >> nifty little talking digital one are never the same -- I've NEVER seen    
   >> two gauges the same, in fact.  For one reason, you lose a little air    
   >> each time you check.  I wonder if the sensor device itself has a tiny leak.   
   >>    
   >> Some of the tires have plastic caps, some not. I had a cap on this one    
   >> originally, but I lost it a while back.  No difference.  I keep meaning    
   >> to buy some of the metal ones with the core tool, but I forget.   
   >>    
   >>> You did not say if it is always the Same tire -   
   >>> will assume so.   
   >>    
   >> Yes.  The others hold air for months with or without cap.   
   >>    
   >>> Every time I had that problem there has been a nail or screw in the   
   >>> tread.  The left rear of my Kia had that problem for last two years and   
   >>> I finally upped the air pressure to 40+ and soaped it.  Found the screw   
   >>> and removed it with needle nose pliers and then plugged it.   
   >>    
   >> I'm sure that if the dealer (amazingly enough, and against everything I    
   >> knew about buying used cars for the last 50 years, I bought the car from    
   >> the dealer, and it was the first one I drove when I decided on a 2- or    
   >> 3-YO Corolla -- I couldn't see a reason to NOT buy this one!) would have    
   >> found something obvious if he'd bothered to look.  They used to do a    
   >> free rotation with the discounted oil change, so there's really no    
   >> reason he shouldn't have given it a visual inspection;  I didn't expect    
   >> them to take it off the rim.   
   >>    
   >>    
   > A *visual inspection in-situ* will not find a slow leak. All that is   
   > doing is a scan for the obvious, like a *visible nail*. To do a proper   
   > inspection for a slow leak, you really need to remove the wheel and do   
   > an immersion test. A pressure leak that loses ~10psi over a week will   
   > show as a bubble every now and then during the test. When I was a wee   
   > apprentice, we had a water vat purely for the purpose of leak testing   
   > tyres. The practice works.   
      
   Works fine for motorcycle and bicycle tubes. Car tires, not so much.    
   Easier to just pump the damn thing every couple of weeks.  Know anything   
   about the effects of Slime on pressure sensors?   
      
   > FWIW, your tyres are getting to the point where I would call them *time   
   > expired* or, as they say, past their *use by date*.    
      
   So I've been told, but I've never had tires "expire" from anything not    
   involving tread, puncture or -- and this I regard as criminal --    
   sidewall bubbles in the defective and obsolete tires the Cadillac (or    
   maybe it was Ford, it was quite a while ago) dealer sold to my mom at a    
   premium price and refused to replace, turning the problem over to    
   Bridgestone.  My Ducati's tires held air for at least 20 years in spite    
   of visible crackling on the sidewalls.  Probably more because I don't    
   know when the previous owner bought them.   
      
   > I have never had the   
   > issue of tyres time expired, they are typically worn out in 3 to 5   
   > years. I'd clock up 33 k miles in 2 years, maximum 3, so I've never seen   
   > a tyre on any of my cars over 5 years old.   
      
   They don't get much wear at 3K miles/year.   
      
   --    
   Cheers, Bev   
       "I just realized how bad the economy really is. I recently   
        bought a new toaster oven and as a complimentary gift,   
        I was given a bank."                        -- L. Legro   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)