2001 Chrysler Sebring

Noises problem
2001 Chrysler Sebring 6 cyl Two Wheel Drive Automatic 108000 miles

Hi, I have a 2002 Chrysler Sebring Convertible, 2.7 liter engine. Engine was always silent til a couple of months ago when I started hearing a tick-tick-ticking noise which appears to be coming from the vicinity of the valve cover. The sound is not there when you first start the engine, it comes ONLY when the engine warms up. The tick-tick is regular and rhythmic. It increases proportionally with the RPM's. Any idea if it's lifter, or an exhaust leak, or something else? Thank you very much in advance.
April 15, 2009.

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