Evaporative Emissions System: Testing and Inspection

Engine coolant temperature: 80 - 95°C (176 - 205°F)





1. Disconnect the vacuum hose from the intake manifold purge hose nipple and connect a hand vacuum pump to the nipple.

Purge Port Vacuum Curve:

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, it is possible that the intake manifold port may be clogged and require cleaning.