Here's why:
* Accelerator Pedal Position Sensor (APPS): This sensor tells the Powertrain Control Module (PCM) how far the pedal is pressed. A faulty APPS could send incorrect signals, leading to poor or no acceleration. However, it doesn't directly control fuel flow; it provides input to the PCM.
* Throttle Body Position Sensor (TPS): Similar to the APPS, but measures the actual throttle plate position. A faulty TPS can also cause poor acceleration or no response.
* Mass Airflow Sensor (MAF): Measures the amount of air entering the engine. The PCM uses this information along with the APPS/TPS signals to determine the correct fuel-to-air ratio. A faulty MAF sensor can cause a lean condition (too little fuel) or a rich condition (too much fuel), leading to poor performance or no acceleration.
* Fuel Pump Relay and Fuse: These protect the fuel pump. If either is blown, the fuel pump won't run, thus no fuel will reach the engine regardless of gas pedal position.
* Fuel Pump itself: A failing fuel pump can't deliver enough fuel, even with a fully functioning electrical system.
* Powertrain Control Module (PCM): The "brain" of the engine. A faulty PCM can cause a multitude of problems, including issues with fuel delivery based on various sensor inputs.
In short: While a faulty APPS could be a *cause* of your problem, it's much more likely a symptom of a broader issue. You need to have the vehicle diagnosed properly by a mechanic or using an OBD-II scanner to identify the actual fault codes. Simply replacing parts without knowing the root cause is a waste of time and money.
