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Home >> Dodge and Ram >> 1995 >> Spirit 2.5 K >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - 2.5L TBI >> Test NTC-13A >> Checking EGR System

Checking EGR System

  1. If vehicle is not equipped with an Exhaust Gas Recirculation (EGR) valve, this check does not apply. If vehicle is equipped with an EGR valve, using scan tool, read module information.
  2. If module information reveals vehicle is equipped with California emissions, this test does not apply, however this test can still be performed. Go to next step. If module information reveals vehicle is not equipped with California emissions, go to next step.
  3. Disconnect vacuum hose from EGR solenoid. Connect vacuum gauge to disconnected vacuum hose. On all vehicles, start engine. If vacuum is more than 10 in. Hg at idle, go to step 5).
  4. If vacuum is less than 10 in. Hg at idle, disconnect EGR vacuum signal hose at intake manifold. Connect a vacuum gauge to intake nipple. Read vacuum gauge at idle. If vacuum is more than 10 in. Hg at idle, repair restriction or leak in vacuum hose to EGR solenoid. Perform TEST VER-2. If vacuum is less than 10 in. Hg at idle, repair plugged vacuum nipple at intake nipple. Perform TEST VER-2.
  5. Disconnect vacuum gauge. Reconnect vacuum hose to EGR solenoid. Disconnect vacuum hose from EGR valve. Connect vacuum gauge to disconnected hose. While observing vacuum gauge, disconnect EGR solenoid electrical connector. If vacuum is less than 5 in. Hg at any time, replace EGR valve assembly. Perform TEST VER-2. If vacuum is more than 5 in. Hg at any time, go to next step.
  6. Disconnect hose to EGR valve backpressure signal tube. Adjust a shop air hose to 20 psi (1.4 kg/cm2 ). Turn ignition off. Connect shop air to nipple on base of EGR valve. Listen for a tone change while opening and closing throttle.
  7. If tone changes, replace EGR valve. Perform TEST VER-2. If tone does not change, remove vacuum gauge. Cap open nipple at EGR valve base. Connect hand-held vacuum pump to EGR valve.
  8. Start engine. Listen for engine RPM change while slowly applying vacuum to EGR valve. If engine RPM does not change, replace EGR valve. Perform TEST VER-2. If engine RPM changes, turn ignition off. Apply 10 in. Hg and hold for 30 seconds. If vacuum holds for 30 seconds, EGR system is functioning properly. Test is complete. If vacuum does not hold for 30 seconds, replace EGR valve. Perform TEST VER-2.
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