losing tyre pressure

[mkforks]

anyone having problems with losing tyre pressure ???
ever since I have had the car I have been losing about 12 psi per week just from the rears
due to work commitments the car does not get used very much and can sit in the garage all week and then get used on a sunday
when I start the car the tpms says low rear pressure and 21 psi in each reARS AND 33 IN THE FRONTS
WHEN I CHECK IT WITH A TYRE GAUGE IT IS AROUND 21 PSI IN THE REARS so the tpms looks like its operating correctly
have checked the tyres for punctures and the tyres look perfect
I think its either leaking tyre valves or the tyres not sealing on the rims
before I take it back to the dealer has anyone else had this problem ???

Sponsored

 

[paul123]

strange to see that happening on two tires

car sitting should not make a difference

 

[Cobrakev]

First get some soapy water and spray the valves and rim to see if they are leaking. The valves my not be tight and allowing air to escape.

 

[Need4SpeedMotors]

I second the valve stem check those asap.

 

[Norm Peterson]

Check everything with the soapy water. Valve stems - check the cores for seating. Unscrew them a little and retighten them to reseat them and push the core to bleed a little air out in case any little piece of grit is keeping them from fully seating.

Beads - check all the way around the beads on both sides.

And one other thing . . . check even the barrels of the rims. I'm not kidding about this, since it happened to me (many years ago, but that doesn't mean it can't still happen). Castings are sometimes porous, and sometimes out-of-spec products manage to escape the production facility.

I ended up running tubes because the wheels were aftermarket; with OE wheels I'd bring them straight back to the dealer for a swap to wheels that don't leak.


Norm

 

[jasonstang]

Either you have a puncher or the valve stem is broken during installation.

 

[Need4SpeedMotors]

I got money on the valve stem.

Sponsored