New answers tagged leak
Book your car into a repair shop for a smoke test on your intake and exhaust systems. This will reveal any vacuum leaks. Also, do not under estimate the value of a scan on your engines systems.
It is usual problem: contact place of tyre-rim is corroded. Just remove it
The Shrader valve is the definitive seal. The cap is there to keep dirt & crud out of the Shrader valve. The plastic threads on those caps aren't enough to hold more than a few pounds of pressure, and there's no way to get Teflon plumber's tape on those threads. So... you might replace the Shrader valve, or at least reseat it (that often does the job - ...
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