- Dirty fuel filter: As the fuel passes through the filter over time, it can accumulate debris and become clogged, restricting the flow of fuel to the engine. This can cause hesitation and stalling.
- Faulty fuel pump: If the fuel pump is not functioning properly, it may not be able to deliver enough fuel to the engine. This can lead to a lean-running condition and can also cause stalling.
Ignition System Issues
- Faulty ignition coil: The ignition coil is responsible for generating the necessary electrical energy required for igniting the air-fuel mixture in the cylinders. If the ignition coil is faulty or has a weak spark, it can result in stalling, especially when under load.
- Ignition control module (ICM) issues: The ICM is responsible for controlling the ignition timing and distributor function. A faulty ICM can disrupt the timing, causing the engine to run poorly or stall.
- Distributor problems: Issues within the distributor, such as a worn distributor cap or faulty pick-up coil, can affect the ignition timing and cause stalling issues.
Idle Air Control (IAC) System Problems
- IAC valve issues: The IAC valve is responsible for controlling the idle airflow, helping to maintain a consistent idle speed. If the IAC valve is not functioning correctly or is clogged, it can cause stalling, especially when coming to a stop.
Mass Airflow (MAF) Sensor
- Faulty MAF sensor: The MAF sensor provides the engine control unit (ECU) with information about the air entering the engine. A faulty MAF sensor can provide incorrect data, affecting the fuel mixture and leading to stalling.
- Vacuum leaks: Vacuum leaks in the intake system or other vacuum lines can lead to a lean fuel mixture and can also contribute to stalling issues.
Throttle Body Issues
- A dirty or faulty throttle body can interfere with airflow, causing the engine to run roughly or stall.
