Valve Guide
WARNING: This page is about a different car, the 2005 Dodge Stratus and 2005 Chrysler Sebring. However, it is still accessible from the selected car via links, so may be relevant.
Measure the clearance between the valve guide and valve stem. If it exceeds the limit, replace the valve guide or valve, or both.
Standard value:
< Intake > 0.02 - 0.05 mm (0.0008 - 0.0019 inch)
< Exhaust > 0.04 - 0.07 mm (0.0016 - 0.0027 inch)
Limit:
< Intake > 0.10 mm (0.003 inch)
< Exhaust > 0.15 mm (0.005 inch)