Bronco L6-300 4.9L VIN Y 1-bbl (1983)
EGR Valve: Testing and Inspection
EGR Venturi Vacuum Amplifier
Idle must be set to specifications, engine must be at normal operating temperature and manifold vacuum must be adequate for this test.
1.
Connect a vacuum gauge hose at EGR valve. The gauge may read as high as 2 inches Hg at idle.
2.
Disconnect venturi hose at carburetor and increase engine speed to 2000 RPM (3000 on 2300 cc engines).
3.
Connect venturi hose. Gauge should read 4 inches Hg.
4.
Return engine to idle. Gauge should return to initial reading.
5.
If operation is not as described previously, replace VVA.
