The stalling could be due to several other issues related to the fuel system or other engine components:
* Fuel Pump Relay: This relay controls the power to the fuel pump. A faulty relay will prevent the pump from working.
* Fuel Pump itself: The fuel pump might be failing, weakening, or clogged.
* Clogged Fuel Filter: A clogged filter restricts fuel flow to the engine.
* Crankshaft Position Sensor (CKP): This sensor tells the engine computer the crankshaft's position; a faulty one will cause stalling.
* Mass Airflow Sensor (MAF): This sensor measures the amount of air entering the engine. A bad MAF can cause a lean condition and stalling.
* Throttle Position Sensor (TPS): This sensor tells the computer the throttle position; a faulty one can cause erratic engine behavior, including stalling.
* Ignition System: Problems with the ignition coil, spark plugs, or wires can prevent the engine from running.
* Low Fuel: Sometimes it's the obvious! Check your fuel gauge.
Troubleshooting Steps:
1. Check the obvious: Make sure you have enough fuel.
2. Check the fuel pump relay: Locate the relay (usually in the under-hood fuse box) and try swapping it with a known good relay of the same amperage.
3. Listen for the fuel pump: When you turn the ignition key to the "ON" position (but don't start the engine), you should hear a brief humming sound from the fuel pump. If you don't, the pump or relay is likely the culprit.
4. Check the fuel filter: It's relatively inexpensive and easy to replace; a clogged filter can cause stalling.
5. Have the car scanned for diagnostic trouble codes (DTCs): An OBD-II scanner can read codes stored in the car's computer, which can pinpoint the problem. Auto parts stores often offer free code scanning services.
In short: Focus your troubleshooting efforts on the fuel system and other engine sensors mentioned above. The oil pressure switch is extremely unlikely to be the cause of your stalling problem. If you're not comfortable working on your car, take it to a qualified mechanic.
