* Throttle Position Sensor (TPS): This sensor tells the computer how much the throttle is open. A faulty TPS can send incorrect signals, leading to the computer cutting fuel or ignition when you accelerate, causing a stall. This is a very common cause of this symptom.
* Mass Air Flow Sensor (MAF) or Air Flow Meter (AFM): (Depending on the exact configuration, it might have an AFM rather than a MAF). This sensor measures the amount of air entering the engine. A faulty sensor will lead to incorrect fuel mixture calculations. If it's reading too little air, the computer might starve the engine when you try to accelerate, causing a stall.
* Fuel Delivery Problems:
* Fuel Pump: A weak or failing fuel pump might not be able to supply enough fuel under increased demand (acceleration).
* Fuel Filter: A clogged fuel filter will restrict fuel flow, leading to similar symptoms as a weak pump.
* Fuel Injectors: Clogged or malfunctioning fuel injectors could prevent proper fuel delivery.
* Fuel Pressure Regulator: A faulty regulator can cause inconsistent fuel pressure.
* Ignition System Problems:
* Distributor Cap and Rotor: Worn or damaged components in the distributor can cause misfires, especially under load (acceleration), leading to stalling.
* Ignition Coil: A weak or failing ignition coil may not provide enough spark to ignite the fuel-air mixture under load.
* Spark Plugs and Wires: Worn or fouled spark plugs and damaged wires can cause misfires and stalling.
* Vacuum Leaks: A significant vacuum leak can disrupt the engine's operation, especially when you increase the engine load by pressing the accelerator. This can affect fuel/air mixture and timing.
* Computer/ECM Issues: While less common, a failing Engine Control Module (ECM) could be sending incorrect signals to the fuel and ignition systems.
Troubleshooting Steps:
1. Check for obvious issues: Inspect all vacuum lines for cracks or leaks. Examine the fuel filter for obvious clogging. Check the spark plug wires for damage or cracks.
2. Start with the easy/cheap things first: Change the spark plugs and wires. Replace the fuel filter.
3. Diagnostic tools: A mechanic with a scan tool can read diagnostic trouble codes (DTCs) from the ECM. This will pinpoint many potential issues. It would likely be the best first step for diagnosing.
4. Test the TPS, MAF/AFM: These are often relatively inexpensive to replace and are common culprits. A mechanic can test the sensor's output.
5. Fuel pressure test: A gauge can be used to check fuel pressure.
Because this issue is related to acceleration, it's likely connected to a sensor or component that's only under stress when the throttle is open. Getting a diagnostic scan is highly recommended before undertaking more extensive repairs. Replacing parts randomly without knowing the root cause is inefficient and costly.
