Originally Posted by GTOtbird

Took GTO in for 6,000 mile service which included tire rotation.
I asked Shop to also check for the infamous "strut rub."
Service advisor reported no signs of stut rub--this is not the problem just information for those concerned about the strut rub.

Problem was: Drove car directly home 10 miles in a gentle rain, regular roads, no excessive speed or spinning tires, just playing my Rhett Miller CD a little loud. Parked GTO in garage, and next day it rained, and I was home alone organizing my computer room. About 1 p.m. decided to tackle the garage and noticed right rear, passenger side tire was flat. Crap!, I can't remember the last time I had a flat on my car. So, I pulled out manual to find jack point, jacked up GTO. Decided that the mini spare would look like crap and so I decided to inflate the tire and see if was still leaking before putting on the spare. Also, knew it would be hard to find a tire place open the Saturday before Christmas. Inflated tire to 36 psi and began calling, of course Pontiac dealer was closed, and after about 6 phone calls, found a BFG dealer open. Checked tire pressure and still at 36 psi. Drove to shop, this where it begins to be strange--THEY COULD NOT FIND A LEAK! Verified correct tire checked, drove home and emailed Pontiac service advisor (SA). I have checked tire pressure on all four tires about every six hours and tire is holding pressure. Over the last 5 days tire is down about 1/2 pound, most likely because of frequent checking the tire. Anyway, talked to SA and Service Manager and they have no explanation. I have discussed with many others and thought about this for days and my only conclusion is that tire must have been deflated BEFORE I left dealership. When car was returned to me I did not do a walk around and did not see the RR tire. Main reason I know tire was deflated was when I opened the garage door I saw a dual mark in the concrete driveway going into the garage and it ended at the rr tire. Obviously made by the rim. The outside of tire looks O.K. and I was on vacation so did not drive GTO until today.

I am scheduled to take GTO back to dealer Saturday Morning, as this was my first and may very well be my last trip to this Pontiac dealer. The Service Manager has agreed to pull the tire, soak in the "water vat" and then take tire off the rim, and see tire is damaged.

Leason learned: ALWAYS do a complete walk around before leaving any service establishment.

Please only reply if you have ever had something like this happen--that is a tire goes flat for no apparent reason but then after inflating the tire it holds pressure.