I purchased a 2016 LX in February this year, shod with Firestone 721 tires.

No matter how much driving I do, the tires seem to lose air pressure every two weeks or thereabouts. I'll get the TPMS warning light and then check each with a digital air gauge. The TPMS warning light seems to come on when one tire reaches 22 lb. Then I'll check each, and although they lose air at different rates, they seem to uniformly lose air and then I'm airing up all of them, not any particular one.

I'm beginning to wonder if all of them have a bad bead seal. I didn't think going from alloys on my GD3 to steelies on the LX would have resulted in this. I've examined each tire and I can't find any signs of puncture. Wondering if anyone else has run across this problem.

 

I suspect an air thief!

 

take it to your tire shop for comments. valve stem seals can go bad.

 

LOL... Air Thief.

Has it been really cold where you live? Tires do slowly lose air when it is colder. I forgot the exact psi drop for every degree of temp drop.

I just run mine at 38 lbs at sea level all year round in SoCal.

But yeah, sometimes the valve stem, and bead can leak.

 

He's losing far too much air too quickly for it to be temp related. Valve stem or bead.

 

I've had issues on my Accord where it was both the stem and the bead seal. A good tire shop should diagnose it quickly.

 

This has been happening all summer, so it's not cold related.

 

Take it to your favorite tire shop (including Walmart) and they will find the source of the leak. They will air it up to abut 50 PSI and put it in a water tank if it leak is not readily apparent. Our local Wally World is a flat $10 to repair a leak of any kind.

 

usually tires have a manufacture's warranty so the work might be free. $10 each is not bad deal though regardless as the tires will need to be mounted and rebalanced which usually costs $60+

 

I've had tires that lose air. (Permeable?) And I know it was the tires 'cause the next set were fine. This, with the same valves (this car used metal valve stems).

OTOH, my daughter had one car (Isuzu) where the tires ALWAYS lost air at a faster-than-normal rate. This kept up over several sets of tires. I figured it was the alloy wheels.

My only contribution, then, is that bargainguy is stuck with adding air periodically. If it were me, I'd over-inflate a bit (3 - 5 PSI) to lengthen the interval. If you have a Smartphone with a calendar, create a reminder to check the inflation every month or so.

 

An easy check (though not too likely to be helpful) is to make sure the valve cores are snugly installed in the valve stems. You need a valve core remover tool for this, a sort of two-pronged round screwdriver thingy. They're not expensive.

 

Sounds odd to me if it is happening on all tires. The Firestone's on our 2016 have been pretty constant since we bought it 3 months ago.

 

IIRC, it's approx 1 PSI for every 10*F drop in temp, give or take, and am sure that varies wildly by tire brand and size. Tubeless tires are pretty consistent, compared to back in the day when we had inner tubes in the tires...much more permeable than modern tubeless tires. I'd side with it being a valve or bead leak, and YES, to the advice to have a valve stem tool on hand....have had one forever, was probably my dad's Seemingly insignificant lil device, but brother, when ya need it, it's invaluable...

 

Simple solution, drop the wheel into a kiddie pool full of water, let it sit for a few minutes, and look for bubbles!

If you suspect bead leaks, just lay the tire flat, squirt soapy water on the bead and let sit. Leaks will form bubbles after a few minutes.

 

I had a puncture in the rear driver side. I took it to Discount Tire; they patched it for free even though it was an OEM, though I bought tires there before. Firestone wanted $20. Honda dealer never got back to me.