Intake Manifold: Testing and Inspection

WARNING: Use extreme caution when the engine is operating. do not put your hands near the pulleys, belts or the fan. do not wear loose clothing.

LOW MANIFOLD VACUUM
An intake manifold leak is characterized by lower than normal manifold vacuum. Also, one or more cylinder may not be functioning.

PROCEDURE
1. Start the engine allowing it to warm up.
2. Inspect for disconnected vacuum hoses or hardened or cracked vacuum lines.
3. With a spray bottle, spray a small stream of water on the suspect area.
4. If there is a change in RPM the suspected leak has been found.
5. Repair as required.