Component Tests and General Diagnostics

MANIFOLD VACUUM CHECK
1. Before inspection, set vehicles in the following condition:
- Engine coolant temperature: 80 - 95°C (176 - 203°F).
- Lights and all accessories: OFF
- Transmission: P range
2. Connect a tachometer.





3. Attach a Tee-fitting 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)