Engine Vacuum Check

The engine vacuum that develops in the intake line is a good indicator of the condition of the engine. The vacuum checking procedure is as follows:
1. Warm up engine to normal operating temperature.





2. With engine stopped, disconnect MAP sensor hose from intake manifold and connect 3-way joint, hoses and special tool (vacuum gauge and joint) between intake manifold and MAP sensor hose disconnected.

Special Tool, or equivalent:
(A): 09367-04002
(B): 09343-03087
(C): 09915-67310
(D): 09918-08210

3. Run engine at specified idle speed, and read vacuum gauge. Vacuum should be within following specification.

Vacuum specification: 52.6 - 65.8 kPa (15.7 - 19.7 inches Hg) at specified idling speed

4. After checking, connect vacuum hoses.