Fuel System:
* Clogged Fuel Filter: A dirty fuel filter restricts fuel flow to the engine, leading to stalling. This is a relatively inexpensive and easy fix.
* Fuel Pump Failure: A failing fuel pump can't deliver enough fuel under pressure, causing the engine to starve and stall.
* Bad Fuel Injectors: Clogged or faulty injectors prevent proper fuel delivery to the cylinders.
* Low Fuel Pressure: Problems with the fuel pressure regulator can cause inconsistent fuel pressure.
Ignition System:
* Crankshaft Position Sensor (CKP): This sensor tells the engine's computer the position of the crankshaft. A faulty sensor will cause misfires and stalling.
* Cam Position Sensor (CMP): Similar to the CKP sensor, a bad CMP sensor can disrupt the engine's timing and cause stalling.
* Ignition Coil(s): A failing ignition coil can prevent spark to one or more cylinders, leading to misfires and stalling.
* Spark Plugs and Wires: Worn or damaged spark plugs and wires can prevent proper ignition.
* Distributor Cap and Rotor (if applicable): On some models, worn or damaged distributor components can affect ignition.
Other Potential Issues:
* Mass Airflow Sensor (MAF): A faulty MAF sensor provides inaccurate air flow readings to the engine's computer, causing poor fuel mixture and stalling.
* Throttle Position Sensor (TPS): A malfunctioning TPS provides incorrect throttle position data, leading to stalling.
* Vacuum Leaks: Leaks in the vacuum system can disrupt engine performance and cause stalling.
* Computer Issues (PCM/ECM): Problems with the engine control module can cause a variety of problems, including stalling.
* Alternator: A failing alternator can cause the battery to die, leading to stalling.
* Transmission Issues: In some cases, transmission problems can indirectly cause stalling.
Troubleshooting Steps:
1. Check the obvious: Ensure you have enough gas.
2. Check engine codes: Use an OBD-II scanner to read any diagnostic trouble codes (DTCs) stored in the engine's computer. These codes can provide valuable clues about the problem.
3. Inspect visually: Look for any obvious signs of damage, leaks, or loose connections.
4. Listen for unusual noises: Unusual sounds from the engine bay could indicate a specific problem.
Recommendation:
Since there are so many potential causes, it's best to have a qualified mechanic diagnose the problem. Attempting repairs without proper knowledge could lead to further damage or injury. Providing the mechanic with any codes you obtain from an OBD-II scan will greatly assist them in finding the solution.
