Engine Vacuum Check

WARNING: This page is about a different car, the 2003 Suzuki Vitara. However, it is still accessible from the selected car via links, so may be relevant.

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:

Warm up engine to normal operating temperature and make sure that engine idle speed is within specification.
NOTE: After warming up engine, place transmission gear shift level in "Neutral" (shift selector level to "P" range for A/T model), and set parking brake and block drive wheels.
Stop engine and disconnect vacuum hose (2) from intake manifold (1).
Connect special tools (vacuum gauge and hose joint) to vacuum hose and intake manifold.
Special tool
1. (A): 09915-67310
2. (B): 09918-08210
3. (C): 09343-03087 (Hose (SUZUKI genuine part))
4. (D): 09367-04002 (3-way joint (SUZUKI genuine part))
Fig 1: Identifying Vacuum Gauge Components
Courtesy of SUZUKI OF AMERICA CORP.
Start engine and run engine at specified idle speed (see "idle Speed / Idle Air Control (IAC) Duty inspection:"), and read vacuum gauge. Vacuum should be within specification.
Vacuum specification (at sea level): 52.6 - 65.8 kPa (40 - 50 cmHg, 15.7 - 19.7 InHg) at specified idle speed)
After checking, remove vacuum gauge and hose joint.
Connect vacuum hose to intake manifold.