* Security System: The Passlock system (theft deterrent) in many GM vehicles from this era can prevent starting if the key isn't properly recognized. Try all available keys if you have them. If the system is malfunctioning, it could be the problem.
* Crankshaft Position Sensor (CKP): This sensor tells the engine's computer the position of the crankshaft. A faulty CKP will prevent the engine from starting because the computer can't synchronize fuel and spark. This is a common cause of no-start conditions, especially after the engine has run and then shut down unexpectedly.
* Cam Position Sensor (CMP): Similar to the CKP, but it monitors the camshaft. A faulty CMP can also lead to a no-start condition.
* Ignition Switch: A failing ignition switch might not be providing the necessary power to the starting system components. If the ignition switch is failing intermittently, this could explain the sudden shutdown and inability to restart.
* Fuel Pump Relay or Fuel Pump: If the fuel pump isn't delivering fuel, the engine won't start. A faulty relay is a common and relatively easy-to-check point. The fuel pump itself could also be failing or have lost prime.
* Battery/Alternator: While the starter spinning suggests sufficient battery power, a weak battery could cause the engine to shut down under load, especially with the extra strain of a supercharger. A bad alternator could also be contributing if it's not charging the battery properly. Check the battery voltage with a multimeter.
* Mass Airflow Sensor (MAF): A bad MAF sensor can cause a lean condition (not enough fuel), leading to stalling or shutdown, especially under load.
Troubleshooting Steps (in order of ease):
1. Check the battery voltage: A multimeter is your best friend here. Make sure the voltage is within the normal range (around 12.6V when not running, and 13.5-14.5V while running).
2. Check the fuel pump relay: Locate the fuel pump relay in the underhood fuse box (consult your owner's manual). You can try swapping it with a known good relay of the same type.
3. Listen for the fuel pump: When you turn the key to the "on" position (without cranking), you should hear the fuel pump prime for a few seconds. If you don't hear it, the pump, its relay, or its wiring could be faulty.
4. Inspect fuses: Check all fuses related to the engine and ignition system.
5. Have the car scanned for diagnostic trouble codes (DTCs): This is the most crucial step. A scan tool can retrieve stored codes from the engine control module (ECM), which often pinpoint the malfunctioning component. An OBD-II scanner is readily available at auto parts stores.
Important Note: Because your car has a supercharger, additional components could be involved, like the supercharger itself or its associated components. A thorough inspection by a qualified mechanic who is familiar with supercharged engines is recommended to avoid further damage. Attempting advanced diagnostics or repairs yourself on a supercharged engine without the proper knowledge and tools can be risky.
