In article <rrvar195avkbhtaq9omlgigkm40cnnj4ob@4ax.com>,
Randy <Randy@fake.com> wrote:

> The rear tire of our 1995 Honda Civic has a leak. In about a week, the
> pressure goes from 30 psi to just about nothing. But I can't find the
> leak.
>
> The Honda dealer checked all 4 tires and declared that none leak. But
> still, after a week, the rear tire is flat.
>
> Today I checked it myself with soapy water. No bubbles. I removed the
> wheel from the car and now it is in our bathtub upstairs and there are
> STILL no bubbles.
>
> How can this be? Any ideas?
>
> R.

A lot of good suggestions here.

Another possibility is a cracked valve stem. Centrifugal and inertial
forces flex the stem all over the place at road speeds. I'd try bubble
checking again while flexing the stem around with your fingers.

It's not all that common, but I've seen a couple of these through the
years. If I'm right, it's an easy fix for your local tire shop. You
really should have them re-balance it too. Insist they install a 'long'
stem if hubcap/air chuck interference is an issue. It's also a good idea
to always get new stems whenever you buy tires...

Good Luck, let us know how it turns out.

Erik