- Fuel issues:
- Clogged fuel filter: A clogged fuel filter can restrict fuel flow to the engine, causing the engine to stall.
- Faulty fuel pump: A failing fuel pump may not be able to deliver enough fuel to the engine, leading to stalling.
- Air intake problems:
- Blocked air filter: A dirty or blocked air filter can restrict airflow to the engine, causing it to stall.
- Ignition system malfunctions:
- Spark plug failure: Worn-out spark plugs can produce a weak spark or none at all, leading to engine stalling.
- Faulty ignition coil: A malfunctioning ignition coil may not generate enough voltage to create a strong spark, causing the engine to stall.
- Engine mechanical problems:
- Faulty sensors: Malfunctioning sensors, such as the oxygen sensor or crankshaft position sensor, can provide incorrect data to the engine's computer, leading to stalling.
- Vacuum leaks: Vacuum leaks can cause air to enter the engine's intake system, leading to a lean air-fuel mixture and potential stalling.
At Idle:
- Idle air control valve (IACV) issues:
- Stuck or malfunctioning IACV: The IACV regulates the airflow at idle, and if it's stuck or not functioning properly, the engine may stall when the throttle is released.
- Vacuum leaks:
- As mentioned above, vacuum leaks can cause the engine to run lean and stall, particularly at low RPMs and idle.
- Throttle body problems:
- Dirty throttle body: A dirty throttle body can cause airflow issues, leading to stalling, especially at idle.
- Faulty throttle position sensor (TPS): A malfunctioning TPS provides incorrect information about throttle position to the engine's computer, potentially leading to stalling.
- Faulty fuel injector(s):
- Leaking or clogged fuel injector(s) can cause an incorrect fuel supply to the engine, resulting in stalling at idle or during low RPM driving.
