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 and make sure that engine idle speed is within specification.
2. Stop engine and disconnect vacuum hoses from fuel pressure regulator valve (1).
3. Connect special tools (Vacuum gauge and hose joint) and 3-way joint between vacuum hose and valve.

   Special tool 

   (A): 09915-67311 

   (B): 09918-08210 

   (C): 09355-35754-600 (Hose, SUZUKI genuine part) 

   (D): 09367-04002 (3-way joint, SUZUKI genuine part) 

   Fig 1: Connecting Special Tool

   Courtesy of SUZUKI OF AMERICA CORP.
4. Start engine and run engine at specified idle speed, and read vacuum gauge. Vacuum should be within specification.

   Vacuum specification (sea level)

   450 - 600 mmHg (17.7 - 23.7 in.Hg) at specified idle speed 

5. After checking, remove vacuum gauge and hose joint.
6. Connect vacuum hoses to fuel pressure regulator valve.