Why Car Engine Stops in Idle

When your car engine stops in idle, it can be a frustrating and inconvenient problem. There are a number of potential causes for this issue, including:

1. Idle Air Control Valve (IACV) Problems

The IACV is responsible for controlling the amount of air that bypasses the throttle plate when the engine is idling. If the IACV is not working properly, it can cause the engine to stall when it is idling.

2. Mass Air Flow (MAF) Sensor Problems

The MAF sensor measures the amount of air that is entering the engine. If the MAF sensor is not working properly, it can cause the engine to run too lean or too rich, which can lead to stalling.

3. Throttle Position Sensor (TPS) Problems

The TPS tells the engine control module (ECM) the position of the throttle plate. If the TPS is not working properly, it can cause the engine to stall when it is idling.

4. Vacuum Leaks

Vacuum leaks can cause the engine to stall when it is idling because they allow unmetered air to enter the engine. This can cause the engine to run too lean, which can lead to stalling.

5. Fuel System Problems

Fuel system problems can also cause the engine to stall when it is idling. These problems can include a clogged fuel filter, a faulty fuel pump, or a leaking fuel injector.

6. Electrical Problems

Electrical problems can also cause the engine to stall when it is idling. These problems can include a loose or damaged wire, a faulty ignition coil, or a bad alternator.

7. Computer Problems

Computer problems can also cause the engine to stall when it is idling. These problems can include a faulty ECM or a bad wiring harness.

If your car engine is stopping in idle, it is important to have it diagnosed by a qualified mechanic. The mechanic will be able to determine the cause of the problem and repair it.