EGR Control Port Vacuum Inspection

This check is to be performed with the engine coolant temperature at 176 - 205°F (80 - 95°C).

EGR Vacuum Port Location:

1. Disconnect the vacuum hose from the throttle body EGR vacuum fitting and connect a hand vacuum pump to the fitting.

EGR Port Vacuum Curve:

2. Start the engine and check to see that, after increasing the engine speed, vacuum raises proportionate to engine speed.

NOTE: If the vacuum does not respond as specified in the test, it is probable that the throttle body requires cleaning. Refer to FUEL SYSTEM, COMPONENT REPLACEMENT AND REPAIR PROCEDURES