Loosing air pressure

Tires (valves & rims as well) don't leak because of the increase in pressure. As E.F. stated look for a leak and besure the measurement is only when the tires are cold and you don't have a problem with your tire gage.

 

Higher pressure will cause larger absolute changes with temperature, but not the leakage you describe.

Tom

 

Check your valve stems also. I found that one or two of mine were loose a full turn. You can pick up a tool for that at almost any auto supply. A good way to check for a leak is with a couple drops of water on the stem.

 

That is not normal. After 2 weeks (about 800 miles) my tires at 44/42 will only drop 1.0 to 1.5 PSI.

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LOSING

:faint:
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I second this. I had exactly the same problem. The car was delivered with loose tire stem cores on all wheels.

 

would using this tool for the valve stems work with tpms?

glancing at a tpms sensor with stem attached does not seem to me it can be turned

 

I third this.

 

You should have said: "...(always loosing spitballs )."

Tom

 

Loose valve cores are common any time tires are changed. This alone is a good reason to check your tires and always keep one of the little valve stem tools handy.

The first thing I check any time I discover a tire losing pressure is if the valve core is loose. About half the time that is the problem. Once I had a valve stem that just wouldn't seat properly and leaked around its base--took it back to the shop and they swapped it out for me (for free of course.) I had rusty steel wheels once on an old Chevy that wouldn't seal tightly around the bead. The other times the problem was a puncture somewhere, and this is almost always the culprit with worn tires.

One other thing, release a little puff of air before you try to turn/tighten the valve core. This matters most when you are unscrewing cores and want to remove debris but it is best to clear any sand/grit out of the way before you tighten as well (even though most of the effect will be on the "wrong side" of the way the threads will be turning to tighten.)

Old/re-used valve cores sometimes leak a little even when fully tightened. They are either sticky or have grit in them. So if you find it bubbling through the stem core even after tightening it is probably time to replace the stem. It has been decades since I changed tires for money (briefly), but I do recall that sometimes I could stop such leaks by pulling the old core from the stem and inserting a new one in the same stem. (Chronic shortage of parts, time limitations, a poor worn out tire machine, and very dirty/rusty conditions for construction equipment sometimes made this preferable to doing it right with a complete breakdown and new stem and all the associated clean up.)