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Test NF-10A - Checking EGR Valve Operation

  1. Disconnect vacuum hose to EGR valve solenoid. Connect a vacuum gauge to disconnected vacuum hose. Start engine. If vacuum gauge reads more than 10 in. Hg at idle, go to step 4).
  2. If vacuum gauge does not read more than 10 in. Hg at idle, turn engine off. Disconnect EGR valve vacuum signal hose at throttle body. Connect vacuum gauge to throttle body nipple. Start engine. Read vacuum gauge at idle.
  3. If vacuum is more than 10 in. Hg at idle, repair restriction or leak in vacuum line to EGR solenoid; if vacuum is less than 10 in. Hg at idle, repair plugged vacuum nipple at throttle body. Perform VERIFICATION PROCEDURE VER-2.
  4. If vacuum was more than 10 in. Hg at idle in step 1), turn engine off. Disconnect vacuum gauge. Reconnect vacuum hose to EGR solenoid. Disconnect vacuum hose from EGR valve. Connect vacuum gauge to disconnected hose.
  5. Start engine. While watching vacuum gauge, momentarily snap throttle open. If vacuum gauge reads less than 5 in. Hg at any time, replace EGR valve assembly. If vacuum gauge is always more than 5 in. Hg, turn ignition switch to OFF position.
  6. Disconnect hose to EGR valve backpressure signal tube. Apply 20-30 psi to nipple on base of EGR valve. While opening and closing throttle, listen for change in air sound. If air sound changes, replace EGR valve assembly. Perform VERIFICATION PROCEDURE VER-2.
  7. If air sound does not change, remove vacuum gauge. Cap open nipple at EGR valve base. Connect vacuum pump to EGR valve. Start engine. While slowly applying vacuum to EGR valve, listen for change in engine speed. If engine speed changes, go to next step. If engine speed does not change, go to step 9).
  8. Turn ignition switch to OFF position. Apply 10 in. Hg for 30 seconds, and hold. If vacuum does not hold for 30 seconds, replace EGR valve assembly. Perform VERIFICATION PROCEDURE VER-2. If vacuum holds for 30 seconds, test is complete.
  9. If engine speed did not change in step 7), remove EGR valve assembly. Inspect manifold passages for plugging. Repair as required. Perform VERIFICATION PROCEDURE VER-2. If passages are not plugged, replace EGR valve assembly. Perform VERIFICATION PROCEDURE VER-2.
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