DR-10H EGR Valve Vacuum Chamber

Complete Driveability Test 10-Step H, before proceeding.
1. With auxiliary vacuum supply connected, apply 10 inches vacuum to the EGR valve.
2. If vacuum holds without bleeding down for at least 10 seconds, proceed to Test 19.
3. If vacuum does not hold for at least ten seconds, replace EGR backpressure valve assembly.