Engine Vacuum Check

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.





4) Start engine and run engine at specified idle speed, and read vacuum gauge. Vacuum should be within specification.
Vacuum specifications (sea level): 59 - 79 kPa (450 - 600 mmHg, 17.7 - 23.7 inch Hg) at specified idle speed
5) After checking, remove all special tools.
6) Connect vacuum hoses to fuel pressure regulator valve.