- Vacuum Leak: Check for any leaks or cracks in the vacuum lines. A vacuum leak can cause the engine to run lean, leading to stalling.
-Idle Control Valve (ICV): The ICV is responsible for maintaining the engine's idle speed. A malfunctioning ICV can cause the engine to stall when you release the gas pedal.
- Mass Air Flow (MAF) Sensor: A faulty MAF sensor can provide incorrect information to the engine's computer, which can result in stalling.
- Oxygen (O2) Sensors: Faulty O2 sensors can cause the engine to run inefficiently and stall.
- Faulty Fuel Pressure Regulator: A faulty fuel pressure regulator can cause the fuel pressure to drop, leading to stalling.
- Spark Plugs and Ignition System: Worn-out or faulty spark plugs and ignition components (like ignition coil or distributor cap) can also cause the engine to stall.
Troubleshooting Steps:
1. Fuel Filter: Since you mentioned replacing the fuel filter, ensure it's installed correctly, and there are no leaks.
2. Check vacuum lines: Visually inspect the vacuum lines for any cracks, disconnections, or damage. Repair or replace any faulty vacuum lines.
4. Clean ICV: Try cleaning the ICV to remove any deposits that may affect its operation.
5. Check MAF Sensor: Disconnect the MAF sensor and start the engine. If the engine idles smoothly, the MAF sensor may be faulty and needs replacement.
6. Check O2 Sensors: Use an O2 sensor tester or consult a mechanic to check the functionality of the O2 sensors.
7. Test fuel Pressure: Use a fuel pressure gauge to check the fuel pressure in the line while the engine is idling. Compare it with the specifications in your car's repair manual.
8. Ignition system: Check the spark plugs for wear or damage and ensure the plug wires are properly connected. Replace any faulty spark plugs or wires. Additionally, check the ignition coil or distributor cap (depending on your engine) for cracks, corrosion, or damage.
9. Computer Scan: Consider taking the vehicle to a mechanic or auto repair shop to have the computer scanned for any error codes that might indicate a specific problem.
Remember that this troubleshooting is general, and the specific diagnosis might depend on your vehicle's make, model, and engine, so don't hesitate to consult a professional if the problem persists.
