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Home >> Nissan-Datsun >> 1990 >> Sentra Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/O Codes >> Poor DRIVEABILITY >> Surge While Cruising
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Surge While Cruising

  1. Ensure there are no vacuum leaks into intake system.
  2. Ensure ignition timing is within specification.
  3. Check EGR control valve operation.
  4. Check EGR control valve solenoid operation.
  5. Remove vacuum hose from fuel pressure regulator and monitor for symptom change.
  6. Ensure fuel pressure is within specification.
  7. For Idle Switch: Enter self-diagnostic Mode IV and perform appropriate switch tests.
  8. For Crank Angle Sensor, Airflow Meter, Ignition Signal & Exhaust Gas Sensor: Center self-diagnostic Mode III and retrieve codes. If vehicle will not start, crank engine before entering self-diagnostic Mode III.
  9. For Crank Angle Sensor, Airflow Meter, Ignition Signal & Exhaust Gas Sensor: Enter self-diagnostic Mode V and monitor real-time diagnostic setting of fault codes. Perform appropriate code chart in TESTS W/CODES article.
  10. Disconnect exhaust gas sensor and monitor change in driveability. If it improves, replace sensor. If not, go to 11.
  11. Enter self-diagnostic Mode II and monitor fuel metering system operation.
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