Fuel Delivery System:
* Empty Gas Tank: The most obvious, but worth checking first!
* Fuel Pump: This is a common culprit. A failing fuel pump might not be delivering enough fuel pressure to the engine, especially under load. You might hear a buzzing sound from the tank area when you turn the ignition on – a weak or absent sound could indicate a failing pump.
* Fuel Filter: A clogged fuel filter restricts fuel flow. This is relatively inexpensive to replace.
* Fuel Injectors: Clogged or faulty fuel injectors might not be spraying fuel into the cylinders properly. This often leads to rough running or misfires, in addition to a lack of power.
* Fuel Pressure Regulator: This regulates fuel pressure in the system. A malfunctioning regulator can cause low fuel pressure.
* Fuel Lines: Cracked, kinked, or otherwise damaged fuel lines can restrict or completely block fuel flow. Look for leaks or unusual bends in the lines.
Other Potential Issues:
* Throttle Position Sensor (TPS): This sensor tells the computer the position of the throttle. A faulty TPS can prevent the computer from sending the signal to inject fuel.
* Mass Airflow Sensor (MAF): This sensor measures the amount of air entering the engine. A faulty MAF sensor can cause incorrect fuel/air mixture calculations, leading to a lack of power.
* Crankshaft Position Sensor (CKP): This sensor tells the computer the position of the crankshaft. A faulty CKP can prevent the engine from firing properly, even if fuel is present.
* Ignition System: While not directly related to fuel delivery, a problem with the ignition system (spark plugs, wires, coil) can prevent the engine from running even if fuel is available. This would usually manifest as a complete lack of running, though.
* Computer Issues: A malfunctioning Engine Control Module (ECM) can disrupt the entire fuel delivery process. This is a less likely cause but should be considered if other issues are ruled out.
Troubleshooting Steps:
1. Check the fuel level.
2. Listen for the fuel pump whine when you turn the ignition key to the "on" position (but don't crank the engine). A weak or absent sound suggests a bad fuel pump.
3. Check for any fuel leaks.
4. Have a mechanic check fuel pressure. This is a crucial diagnostic step to pinpoint problems in the fuel delivery system.
It's impossible to diagnose the exact problem remotely. It's recommended to take your Cavalier to a qualified mechanic for proper diagnosis and repair. Trying to troubleshoot fuel system issues yourself can be dangerous due to the flammable nature of gasoline.
