EGR Component Test
EGR Valve Test1. Start engine and allow to idle.
2. Disconnect vacuum hose from EGR Valve and connect a vacuum pump/gauge to EGR Valve.
3. Apply 150 mm Hg (6 in. Hg) vacuum to EGR Valve.
Vacuum should remain steady and engine should die or become noticeably rough.
- If vacuum remains steady and engine dies or becomes noticeably rough, EGR valve is working properly. Remove the vacuum pump and reconnect EGR vacuum hose; test is complete.
- If vacuum does not remain steady and engine does not die or become noticeably rough, replace EGR valve and retest.
- If vacuum remains steady but engine does not die or become noticeably rough: Remove EGR valve; check EGR valve and manifold for blockage, clean or replace as necessary and retest.