john:

just squirt some engine oil into #1, and if compression comes way up, rings
are shot. if no or little change, valve(s) are the culprit. a vacuum guage
is an elegant and inexpensive diagnostic tool useful for the getting a fix
on ring and valve operation.

there are so many other things that could cause stalling at lights that i
would be very careful not to jump to conclusions. vacuum leaks, fouled
plugs, and on and on, could be causing the stalling.

dan

On Mon, 2 May 2005 07:50:29 -0700, John Schaper <JSchaper@SCHSA.ORG> wrote:

>Last week I posted a question about stalling at stop lights.  After further
>tests, I did a compression test and found #1 at 30, the others at 130-140.
>Had the valves replaced about 5,000 miles ago.  Assuming bad valves, do all
>4 have to be replaced or can just the bad one?  Further, based on the
>compression test, could it be bad rings on the cylinders and not the
valves?
>
>John Schaper
>Assistant Director Ancillary Services
>Health Services Agency
>P.O. Box 3271
>Modesto, CA 95353
>209.558.7102
>209.558.8320 (fax)
>jschaper@schsa.org