i noticed my tire was flat so i aired it up. the next day it was flat again. checked the valve and it was tight. looked over the tire and there are no nails or anything that is puncturing it. any ideas??

 

Its either 1 of 3 things:
-Hole/puncture
-Bad valve/valve not seating properly
-Bad install (not sealing on the rim)

Prop the car up on jackstands, pull the wheel off, get a spray bottle with a very soapy solution of water & dish soap. Fill the tire with air, spray the tire liberally and look for bubbles to indicate your leak.

Or just take it to a tire shop and have them find/fix the problem

 

I just had this the other day. Came out tire was flat filled it with air and took it to the shop they put it in water nothing...it was really cold here the other night but would it really cause the tire to go flay since then no other problems.

 

cold weather can sometimes do that..... when i bought my msr rims i noticed my tps light would come on every few days. im finally like ****. bad seal on the rim, bad seal on the valve stem, or whole in the tire. i dunk tested and there ended up being a pin hole and i mean literally a pin hole in one rim. im like wtf? brand new and a pinhole in the cast. id drunk test it and look more carefully because i barely seen the bubbles coming up.

 

ya aftermarket rims are actually quite prone to pinholes. i had to repair one on a lifted truck at my old shop. brand new rims like i'm taking a day old and i had to take a ballpeen hammer to the rim to seal the hole and use a bead sealer on the inside. only to have 3 more pin holes show up. got it to the point where it was an extremely slow leak and waited for the new rim which was back ordered.