Cuts Out, Misses: Sensor/System
- Check for conditions which may cause an incorrect idle speed:
- Throttle body tampering, excessive deposits, or damage.
- Restricted air intake system.
- Large vacuum leak.
- Check the air intake ducts for being collapsed, damaged areas, looseness, improper installation, or leaking especially between the Mass Airflow (MAF) sensor and the throttle body.
- Check the Throttle Position (TP) sensor and related circuit wiring. See to DTC P0123: THROTTLE POSITION SENSOR CIRCUIT - HIGH VOLTAGE
under DIAGNOSTIC TESTS under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - 3.1L CENTURY, GRAND PRIX & MALIBU article.
- Monitor the 24X crank sensor and the Camshaft Position Sensor (CMP) sensor signal present parameters on the scan tool. If both are not responding, test the sensor feed circuit. Both sensors use a separate feed circuit but are internally connected to power. Check all CKP sensor "A" and CMP sensor circuits for intermittents. See INTERMITTENTS
.
- Check the CKP sensor "B" for an internal short. See ELECTRONIC IGNITION SYSTEM DIAGNOSIS
under IGNITION SYSTEMS in SYSTEM & COMPONENT TESTING - 3.1L CENTURY, GRAND PRIX & MALIBU article.
- Check the Exhaust Gas Recirculation (EGR) system for proper operation. See EXHAUST GAS RECIRCULATION
under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING - 3.1L CENTURY, GRAND PRIX & MALIBU article.
- Check the Positive Crankcase Ventilation (PCV) valve for proper operation. See POSITIVE CRANKCASE VENTILATION
under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING - 3.1L CENTURY, GRAND PRIX & MALIBU article.
- Check the transaxle range switch input with the vehicle in Drive and the gear selector in Drive or Overdrive.
- Check the following for damage:
- Bent balancer interrupter rings.
- Damaged crankshaft position sensor.