Mazda RX-8 Manual page 224

Intake Manifold Vacuum Inspection
1. Verify air intake hoses are installed properly.
2. Start the engine and run it at idle.
3. Disconnect the vacuum hose between the intake manifold and purge solenoid valve from the intake
manifold side.
4. Connect a vacuum gauge to the intake manifold and measure the intake manifold vacuum.
If not as specified, inspect the following:
•
Air suction at throttle body and intake manifold installation points
Fuel injector insulator
Engine compression
(See COMPRESSION INSPECTION .)
5. Specification
MT: −66.7 −56.0 kPa {−500.24 −420.1 mmHg, −19.6 −16.6 inHg}
o
AT: −67.3 −53.4 kPa {−504.7 −400.6 mmHg, −19.8 −15.8 inHg}
o
NOTE:
Air suction can be located by engine speed change when lubricant is sprayed on the area where
•
suction is occurring.
(w) RX8-Engine Troubleshooting
Page 175