Engine Hesitates Or Misses
- Check Manifold Absolute Pressure (MAP) sensor (if equipped).
- Ensure wiring harness, connections, and wires are not broken or loose. Check ECM connector pins and all ECM input signals.
- Check charging system for low output or poor ground connection. Check all electrical connections for tightness.
- Check fuel injector operation and opening duration. Inspect injectors for leaks.
- Check turbo (if equipped) and Automatic Performance Control (APC) systems for proper operation.
- Verify mass airflow sensor filament is not broken and burn- off function is working (if equipped).
- Inspect induction system. Inspect for vacuum leaks downstream of throttle valve. Inspect duct between mass airflow sensor (if equipped) and throttle body.
- Verify fuel pump is okay. Check fuel pressure and pressure regulator. Inspect for leaks in fuel lines or restrictions in return line.
- Check temperature sensor(s).
- Check Throttle Position (TP) sensor.
- Check trigger signals to Ignition Discharge Module (IDM).