Evaporative Emissions System: Testing and Inspection

Vacuum Hose
Engine coolant temperature: 8O-95°C (176-2O5°F)

1. Disconnect the vacuum hose from the intake manifold purge hose nipple and connect a hand vacuum pump to the nipple.
2. Start the engine and check that, after raising the engine speed by racing the engine, vacuum remains fairly constant.





NOTE: If there is no vacuum created, the intake manifold port may be clogged and require cleaning.