How to do Vacuum test?

What is vacuum test?

·         The engine vacuum gauge measure intake-manifold vacuum.

·         The intake manifold vacuum change with load on engine the position of throttle valve.

·         Before making this test check that all vacuum hoses are connected and not leaking.

Procedure

1.       Connect the vacuum gauge to the intake manifold.

2.       Start the engine and run it until it reaches normal operating temperature.

3.       Then note the vacuum reading at idle and other speed.