Removal Procedure

WARNING: This page is about a different car, the 2003 Pontiac Montana, 2003 Oldsmobile Silhouette, and 2003 Chevrolet Venture. However, it is still accessible from the selected car via links, so may be relevant.

Important:

Before you remove the valve keys, rotate the engine so that the piston in the cylinder you are working on is at (TDC) top dead center. This will eliminate the possibility of the valve accidentally falling inside the cylinder.
Do not loosen or remove the spark plug when the engine is hot.
Loosen the spark plug, and clean any dirt and debris from the spark plug recess area before removing.

Remove the spark plug. Refer to ENGINE CONTROLS - REMOVAL & INSTALLATION & OVERHAUL in Removal and Installation in Engine Performance.
Install the J 22794 into the spark plug port. Apply compressed air in order to hold the valves in place.
Remove the rocker arm. Refer to VALVE ROCKER ARM AND PUSH ROD REPLACEMENT .
Compress the valve spring with the J 38606.

Fig 1: Compressing Valve Spring With Valve Spring Compressor
Courtesy of GENERAL MOTORS CORP.
Remove the valve keys.
Remove the valve cap.
Remove the valve spring.
Inspect the valve spring for damage. Replace the spring if it is damaged.
Remove the spring seat/valve stem oil seal.

Fig 2: Removing Valve Stem Oil Seal And Spring
Courtesy of GENERAL MOTORS CORP.