slooow air leak

[slider]

Rear tire (Avon) has a very slow leak.Will drop 20 pounds of pressure over  2 weeks.I can not find the leak,and it has me worried that it could leave me on the road if it suddenly became a bad leak instead of a pest.The valve stem is metal one not plastic and was my first suspect ,it does not appear to be the  source. I also checked the the valve core  and tightened it (did not appear to be loose). I have sprayed soapy water  around the tire rim  as well as the tread with no results.The tire has 4000 miles on it so I would rather not replace it unless I have to.Any suggestions on how to find this pest?Thanx guys.(again)

[old2soon]

If you have a big galvanized wash tub or a swimming pool remove the wheel with the leaky tire overpressure it by 10-12 P S I and immerse the tire to find your leak. The cleaner your water is the easier the leak is to find. A soap water solution brushed or poured-try to prevent application bubbles-might show the leak also. And at times when I worked in a tire shop I have found the leak in the cast wheel. This should find the wascally wab-oh-yer lookin fer a leak!!  RIDE SAFE.

[Chrisj CMA]

you may have a small nail, but it could be the valve stem starting to go.  Spray a little soapy water at the base of the stem and then gently move it around a bit and see if you cant make bubbles

[Bighead]

Valve stem core tight?

[97Valk_CT_Euless]

Just start or has it been this way since the tire was installed?  Tire shops aound here don't do a great job cleaning the rim of the wheel.  Until i started mounting my own I could never get them to hold air over a couple of week period.  Now I don't ever have to add air.  Just sayin.  Might have been a poor job cleaning the rim at the last tire change.

[slider]

thanks guys for the help will try them,right now have to borrow granddaughters pool so I can soak my tire.just started leaking  over the winter  so dont think rim will be the problem but looks like may pull the tire off and check to make sure .thanks will update when culprit is found.