* Low Fuel: The most obvious and easiest to check first. Make sure your fuel gauge is accurate and that you have enough gas.
* Fuel Filter: A clogged fuel filter restricts fuel flow to the engine, causing sputtering and poor performance.
* Fuel Pump: A failing fuel pump can't deliver enough fuel at the required pressure. This often manifests as sputtering, especially under acceleration.
* Spark Plugs/Wires: Worn, fouled, or damaged spark plugs or ignition wires can cause misfires, leading to sputtering and a check engine light.
* Mass Airflow Sensor (MAF) Sensor: This sensor measures the amount of air entering the engine. A dirty or faulty MAF sensor provides inaccurate readings, leading to a poor air/fuel mixture and sputtering.
* Throttle Position Sensor (TPS): A malfunctioning TPS provides incorrect information to the engine control unit (ECU), impacting fuel delivery and causing rough running.
* Crankshaft Position Sensor (CKP): This sensor tells the ECU the position of the crankshaft. A faulty CKP sensor prevents proper timing, resulting in sputtering and poor performance.
* Oxygen Sensor (O2 Sensor): A faulty O2 sensor provides inaccurate readings of the exhaust gases, causing the ECU to adjust the air/fuel mixture improperly.
* Computer Problems (ECU): Although less common, a failing ECU can cause various problems, including sputtering.
What to do:
1. Check the obvious: Make sure you have enough fuel.
2. Check the check engine light: Use an OBD-II scanner to read the diagnostic trouble codes (DTCs). These codes will pinpoint the likely source of the problem. Auto parts stores often offer free code reading services.
3. Inspect visually: Check for any visible damage to the fuel lines, spark plug wires, or other components.
4. Professional diagnosis: If you can't identify the problem using the above steps, take your car to a mechanic for a proper diagnosis and repair. Attempting repairs without proper knowledge can worsen the problem.
The 1999 Cavalier is an older car, so some components may be simply wearing out. The DTCs from the scanner are crucial for efficient and cost-effective repair.
