I had new tires put on last year and have not had any problems until yesterday. I was doing my usual pre-travel checks when I found my left outer dual almost flat! I had just checked it 2 days ago and it was fine.
Got out the compressor and aired up the tire and looked for punctures, nothing. Checked schreader valves, okay. Then I wiggled the valve extension and I could hear air, ahhh must be a bad valve extension. I took the extension off and noticed the metal valve stem on the wheel was loose. I wiggled the valve stem and I could hear the air coming out.
I grabbed a wrench and tightened then valve stem nut and the leak stopped. Now I am wondering how a loose stem could not be leaking for a whole year, then all of a sudden the tire went flat.
This concerns we because I didn't think the tire shop had to remove the metal valve stems to replace the tires, so I guess I need to remove all the wheel covers to check all the other valve stems
Thought I should post this because I have not seen any recent threads discussing loose tire/wheel valves.