Leaking Chevy 22" rim

[Monkeyman]

I have the same problem on one of the cast aluminum wheels on my '04 Blazer. Everything's been replaced, checked, ground down and tested in a tub of water. The only 2 things the shop said it could be is a tiny crack in the wheel or a porous wheel. I leak down about a pound per week.

 

[Blumax]

It could be anyone of the things mentioned so I believe I'll start with the cores. Then have the wheel dunked as Nathanjax suggested if the core is not the problem. Thanks all for your replies...a big help.