* Crankshaft Position Sensor (CKP Sensor): This is a common cause of no-start or stalling issues, especially when coasting. The CKP sensor tells the engine's computer where the crankshaft is positioned, which is crucial for timing the ignition and fuel injection. A failing sensor can provide erratic or incorrect signals, leading to the engine cutting out. This is high on the list because the car turns over, indicating the starter and battery are okay.
* Cam Position Sensor (CMP Sensor): Similar to the CKP sensor, the CMP sensor monitors the camshaft's position. A faulty CMP sensor can cause similar problems, especially if the timing is off.
* Mass Airflow Sensor (MAF Sensor): This sensor measures the amount of air entering the engine. A dirty or faulty MAF sensor can provide inaccurate readings, leading to a lean or rich fuel mixture. A lean condition (not enough fuel) could cause a stall, especially under reduced load (coasting).
* Fuel Pump Relay or Pump itself: While less likely given it stalled while coasting (the fuel pump usually works under demand), a weak fuel pump might struggle to keep up, leading to fuel starvation under load reduction. The relay could be failing intermittently.
* Ignition Coil(s): A failing ignition coil can cause misfires and stalling. However, if all the cylinders were affected, you might expect a rough running *before* the stall, rather than a sudden stop while coasting.
* Throttle Position Sensor (TPS): An inaccurate TPS reading could lead to incorrect fuel delivery, causing a stall, but it's less likely to be the primary culprit in this specific scenario.
Troubleshooting Steps:
1. Check for Diagnostic Trouble Codes (DTCs): Use a OBD-II scanner (available at auto parts stores) to read any trouble codes stored in the car's computer. These codes can provide valuable clues.
2. Inspect the CKP and CMP Sensors: These are relatively easy to access (location varies depending on engine type) and can be visually inspected for damage. A professional can test them for proper functionality.
3. Check the MAF Sensor: Clean the MAF sensor with a MAF sensor cleaner (follow instructions carefully). A severely damaged MAF sensor may need replacement.
4. Test the Fuel Pressure: A mechanic can test fuel pressure to confirm the fuel pump is delivering sufficient pressure.
5. Listen for the Fuel Pump: When you turn the key to the "on" position (but don't start the engine), you should hear the fuel pump prime briefly. If you don't hear it, the pump or relay may be faulty.
Important Note: Without a proper diagnostic scan and potentially some testing equipment, pinpointing the exact cause is difficult. It's best to take the car to a qualified mechanic, especially given the supercharger component which adds a layer of complexity. They have the tools and experience to accurately diagnose and repair the issue. Mentioning that the stall occurred while coasting is crucial information for the mechanic.
