Vacuum Supply Test

Fig 8 Vacuum Pump:

Vacuum for the EGR valve and EGR solenoid is provided by a vacuum pump. This pump is mounted to the gear housing at front of engine and attached to power steering pump (Fig. 8).

Refer to Brakes for additional vacuum pump information and minimum/maximum vacuum specifications.

1. Disconnect the vacuum supply line at EGR valve vacuum regulator solenoid.
2. Attach a vacuum gauge at this point.
3. Start the engine.
4. If vacuum will not meet specifications as shown in Group 5, Brakes, check for leaks in vacuum lines between solenoid and vacuum pump before condemning vacuum pump.