* Crankshaft Position Sensor (CKP): This sensor tells the engine's computer the crankshaft's position and rotational speed. A failing CKP sensor can lead to erratic engine operation, including stalling. It's a common problem and relatively inexpensive to replace.
* Cam Position Sensor (CMP): Similar to the CKP, but for the camshaft. A faulty CMP sensor can cause misfires and stalling, especially when the engine is under load or at higher RPMs.
* Mass Airflow Sensor (MAF): This sensor measures the amount of air entering the engine. A dirty or faulty MAF sensor can cause the engine to receive incorrect air/fuel ratios, leading to stalling. Try cleaning it with MAF sensor cleaner first (following the instructions carefully) before replacing it.
* Throttle Position Sensor (TPS): This sensor tells the computer the throttle's position. A faulty TPS can cause erratic idle and stalling.
* Ignition Control Module (ICM): While you replaced the coil pack, the ICM controls the coil pack. A faulty ICM can still cause intermittent stalling even with a new coil pack. This is less likely if the coil pack was truly the problem since they often fail completely.
* Fuel Pump/Pressure Regulator: Although you cleaned the injectors, there might be a problem with fuel delivery. Low fuel pressure or a failing fuel pump could cause intermittent stalling. A fuel pressure gauge test would be useful here.
* Wiring/Connections: Look for any damaged, corroded, or loose wiring harness connections related to the ignition system, fuel system, or sensors mentioned above. Vibration can cause intermittent connection issues.
Troubleshooting Steps:
1. Check for Diagnostic Trouble Codes (DTCs): Use an OBD-II scanner to retrieve any stored trouble codes. This can pinpoint the problem area.
2. Visual Inspection: Carefully inspect all wiring and connections related to the ignition and fuel systems. Look for any signs of damage, corrosion, or loose connections.
3. Sensor Testing: If you have a multimeter, you can test the voltage and resistance of the sensors (CKP, CMP, MAF, TPS) to see if they're within specifications. However, this often requires some technical knowledge.
4. Fuel Pressure Test: A fuel pressure test is crucial to rule out fuel delivery problems. This requires a fuel pressure gauge.
If you're not comfortable doing these tests yourself, take your car to a qualified mechanic for diagnosis and repair. They'll have the tools and expertise to quickly identify the cause of the stalling. Mentioning the parts you've already replaced will save them time.
