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Home >> Nissan-Datsun >> 1990 >> Sentra Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/O Codes >> Poor DRIVEABILITY >> Stumble On Acceleration
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Stumble On Acceleration

  1. Connect inductive timing light to spark plug wire and check for weakness in flash.
  2. Ensure spark plug wires are within allowable resistance values.
  3. Check for spark using spark tester.
  4. Ensure there are no vacuum leaks into intake system.
  5. For Idle Switch: Enter self-diagnostic Mode IV and perform appropriate switch tests.
  6. Remove vacuum hose from fuel pressure regulator and monitor for symptom change.
  7. Ensure fuel pressure is within specification.
  8. For Airflow Meter & O2 Sensor: Enter self-diagnostic Mode III and retrieve codes. If vehicle will not start, crank engine before entering self-diagnostic Mode III.
  9. For Airflow Meter & O2 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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