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Home >> Nissan-Datsun >> 1990 >> Sentra Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/O Codes >> Unstable Idling >> After Warm-Up

After Warm-Up

  1. Check blow-by hose for clogging.
  2. Ensure there are no vacuum leaks into intake system.
  3. Check canister purge hoses for leaks.
  4. Check vacuum supply to vacuum hose of fuel pressure regulator. Ensure hose is not plugged. Perform FUEL PRESSURE REGULATOR SOLENOID diagnostic chart (if equipped) in SYSTEM/COMP TESTS article. Use DIAGNOSTIC CHARTS DIRECTORY table in SYSTEM/COMP TESTS article to locate chart.
  5. Connect inductive timing light to spark plug wire and check for weakness in flash.
  6. Ensure spark plug wires are within allowable resistance values.
  7. Check for spark using spark tester.
  8. Ensure ignition timing is within specification.
  9. Ensure engine has adequate compression.
  10. Check EGR control valve operation.
  11. Check EGR control valve solenoid operation.
  12. For Idle Switch: Enter self-diagnostic Mode IV and perform appropriate switch tests.
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