Cylinder Head: Valves
WARNING: This page is about a different car, the 2001 Mazda MPV and 2000 Mazda MPV. However, it is still accessible from the selected car via links, so may be relevant.
Measure valve stem length. Measure diameter of valve stem at 3 place places along length of valve stem, and at 90-degree at same locations, for a total of 6 measurements. If valve stem is not within specification, replace valve. See VALVES & VALVE SPRINGS under ENGINE SPECIFICATIONS.