* Failing Mass Airflow Sensor (MAF): This sensor measures the amount of air entering the engine. A faulty MAF sensor can lead to a lean or rich fuel mixture, causing stalling and triggering the check engine light.
* Crankshaft Position Sensor (CKP): This sensor tells the engine's computer the position of the crankshaft. A malfunctioning CKP sensor prevents the engine from knowing when to fire the spark plugs, leading to stalling.
* Camshaft Position Sensor (CMP): Similar to the CKP sensor, but for the camshaft. A faulty CMP can also cause misfiring and stalling.
* Throttle Position Sensor (TPS): This sensor informs the computer of the throttle position. A bad TPS can cause erratic idling and stalling.
* Ignition System Problems: This could include failing spark plugs, wires, distributor cap, or rotor. Weak sparks can lead to misfires and stalling.
* Fuel Pump or Fuel Filter: A failing fuel pump might not deliver enough fuel, while a clogged fuel filter restricts fuel flow, leading to stalling.
* Vacuum Leaks: A significant vacuum leak can disrupt the engine's operation, causing rough running and stalling.
* Computer/ECU Problems: While less common, a faulty Engine Control Unit (ECU) can also cause various problems, including stalling.
What You Should Do:
1. Obtain a Diagnostic Trouble Code (DTC): A mechanic or auto parts store can use an OBD-I scanner (OBD-I for this year car) to retrieve the trouble codes stored in the car's computer. These codes give clues to the specific problem. Note that OBD-I is simpler than later OBD-II systems, so the information may be less precise.
2. Check for Obvious Issues: Before taking it to a mechanic, visually inspect things like the spark plug wires, distributor cap, and rotor for any visible damage.
3. Don't Drive It: Continuing to drive the car with these symptoms could cause further damage. Have it towed or driven only very short distances to a mechanic.
4. Find a Mechanic: A qualified mechanic specializing in older vehicles is ideal for diagnosing and repairing your 1994 Oldsmobile. They will be familiar with the intricacies of OBD-I systems and the specific issues common to that model.
The stalling combined with the check engine light indicates a significant problem that requires professional diagnosis and repair. Ignoring it could lead to more expensive repairs down the line.
