Fuel System Issues:
* Clogged Fuel Filter: This is a common culprit. A clogged filter restricts fuel flow to the engine, causing it to stall under increased demand (acceleration).
* Low Fuel Pressure: A failing fuel pump, clogged fuel lines, or a faulty fuel pressure regulator can all reduce fuel pressure, leading to stalling during acceleration.
* Faulty Fuel Injectors: Injectors deliver fuel to the cylinders. Clogged or malfunctioning injectors can prevent sufficient fuel delivery.
* Bad Mass Airflow Sensor (MAF Sensor): This sensor measures the amount of air entering the engine. A faulty MAF sensor can provide incorrect readings, leading to an improper fuel/air mixture and stalling.
* Dirty Throttle Body: A dirty throttle body can restrict airflow, similar to a clogged air filter.
Ignition System Issues:
* Spark Plugs/Wires: Worn-out, fouled, or damaged spark plugs or wires can prevent a consistent spark, leading to misfires and stalling.
* Ignition Coil: This component provides the high voltage needed for the spark plugs. A failing coil can cause misfires and stalling.
* Distributor (if applicable): Older vehicles with distributors may have a faulty distributor cap, rotor, or internal components causing ignition problems.
Other Potential Causes:
* Crankshaft Position Sensor (CKP Sensor): This sensor tells the engine's computer the position of the crankshaft. A faulty CKP sensor can disrupt ignition timing and cause stalling.
* Cam Position Sensor (CMP Sensor): Similar to the CKP sensor, but for the camshaft.
* Transmission Issues (Automatic Transmission): Problems within the automatic transmission, like low transmission fluid or a failing torque converter, could cause stalling under acceleration.
* Vacuum Leaks: Leaks in the intake manifold or vacuum lines can disrupt the air/fuel mixture.
* Alternator: While less likely to directly cause stalling, a failing alternator can leave the car without enough power, leading to stalling, especially if the battery is already weak.
Troubleshooting Steps:
1. Check the obvious: Ensure you have enough fuel.
2. Check engine codes: Use an OBD-II scanner to read any diagnostic trouble codes (DTCs). These codes can point you directly to the problem.
3. Inspect the fuel filter: Visually check the fuel filter for damage or excessive dirt.
4. Listen for unusual sounds: Listen carefully for unusual noises from the engine while trying to accelerate.
5. Professional Diagnosis: If you are unable to identify the problem yourself, take your car to a qualified mechanic for diagnosis and repair.
Safety Note: If your car stalls frequently while accelerating, it's unsafe to drive. Have it checked by a mechanic as soon as possible. Avoid driving it until the problem is diagnosed and repaired.
