Component Tests and General Diagnostics

MANIFOLD VACUUM CHECK





1. Start the engine and allow it to warm up until the temperature of the engine coolant reaches 80 - 95° C (176 - 203° F).
2. Connect a tachometer.
3. Attach a tee-tatting union to the vacuum hose between the fuel pressure regulator and the intake manifold plenum, and connect a vacuum gauge.
4. Start the engine and check that idle speed is within specification. Then check the vacuum gauge reading.
Idle speed: 700 ± 100 r/min
Minimum limit: 60 kPa (18 inch Hg)