it seems i am losing air bi-weekly in my tires..all around..average is a about 4psi but mostly my right rear is losing it the most...now i dont know if something is in the valve stem to let air out so you don`t have a blow out like the explorer problem..or it could just be weather related...or maybe i am just crazy....

 

Hmmm, if it was just the rear ones, I'd say you've been letting the smoke out of them........

 

Somethings not right if all of them are losing air at that rate. Try to check when tires are cold, and fill when cold. You can get higher readings after driving the car for 20 minutes. Keep that in mind. Also advise to take into dealer or tire shop(Goodyear!) to have the tires/wheels dunked in a water tank. I have seen new cars/wheel have a pinhole causing a slow leak. But all 4 is odd.

 

Like John said, you should only be checking tire pressure and adding air when the tires are cold. After driving 2 miles the tires are hot enough that checking the air pressure is not accurate. Also, I assume this means that you constantly put air in the tires. If that is the case take it back to FORD. Sounds like all of them are not seated on the rim properly so they would have to remount all of them.

 

Chances are it's the gauge you're using! It's not likely that you have problems with all 4 tires.

The walmart special isn't always the best. Make sure you continuously use the SAME good quality gauge. Hold the gauge straight into the valve, not at an angle. Plus, if it's a digital gauge, the tire pressure is usually + or - 2 from actual.