* Crankshaft Position Sensor (CKP): This sensor tells the engine's computer where the crankshaft is in its rotation. A faulty CKP sensor can cause the engine to stall unexpectedly, and it might restart after a short time, as the sensor might temporarily work again.
* Cam Position Sensor (CMP): Similar to the CKP sensor, a faulty CMP sensor provides inaccurate information about the camshaft's position, leading to the engine stalling.
* Mass Airflow Sensor (MAF): This sensor measures the amount of air entering the engine. A dirty or faulty MAF sensor can provide incorrect data, causing the engine to run poorly or shut down.
* Throttle Position Sensor (TPS): The TPS tells the engine's computer the position of the throttle. A faulty TPS can lead to erratic engine behavior, including stalling.
* Ignition System Problems: This could include failing ignition coils, spark plugs, or wires. Intermittent problems in these components can cause the engine to cut out.
* Fuel Pump or Fuel Filter: A failing fuel pump might not deliver enough fuel under load, causing the engine to stall. A clogged fuel filter has a similar effect.
* Alternator: A failing alternator might not charge the battery properly. If the battery voltage drops too low, the engine will shut down.
* Battery Cables or Connections: Poor connections on the battery or corroded cables can cause intermittent electrical problems, leading to stalling.
* Wiring Harness Issues: Damaged or corroded wiring within the engine compartment can create intermittent electrical faults affecting various engine systems.
* PCM (Powertrain Control Module) Problems: While less likely, a malfunctioning PCM, the car's computer, could be the root cause. This is typically diagnosed through professional testing.
Troubleshooting Steps:
1. Check the battery and cables: Ensure the battery terminals are clean and tight. Test the battery voltage.
2. Have the car scanned for diagnostic trouble codes (DTCs): This is the most important step. A scan tool can read codes stored by the car's computer, providing clues about the problem. An auto parts store often provides free code reading.
3. Inspect the sensors: Visually inspect the MAF, TPS, CKP, and CMP sensors for damage or dirt.
4. Check the fuel pressure: If you have the tools and experience, measure fuel pressure to rule out fuel delivery problems.
It's important to get the car diagnosed by a mechanic, preferably one familiar with older GM vehicles. Trying to fix this without a proper diagnosis could lead to further damage or wasted time and money. The DTCs will give the best indication of where to focus the repair efforts.
