TrailBlazer 2WD V8-6.0L VIN H (2006)
Important: Remove the spark plugs from the cylinder head with the engine at room temperature.
3. Loosen the spark plug 1-2 turns.
4. Brush or air blast away any dirt or debris from around the spark plug.
5. Remove the spark plug.
6. Install J 22794 into the spark plug hole.
7. Attach an air hose to J 22794.
8. Apply compressed air to J 22794 in order to hold the valves in place.
