Engine Stops When Car Stops

Causes

There are several possible causes for an engine to stop when a car comes to a stop. Some of the most common causes include:

• Idle air control valve (IACV) problems. The IACV is responsible for controlling the idle speed of the engine. If the IACV is faulty, it can cause the engine to stall when the car comes to a stop.
• Throttle position sensor (TPS) problems. The TPS is responsible for sending signals to the engine’s computer about the position of the throttle. If the TPS is faulty, it can cause the engine to stall when the throttle is closed.
• Vacuum leaks. Vacuum leaks can cause the engine to run lean, which can lead to stalling. Vacuum leaks can occur in a variety of places, including the intake manifold, throttle body, and hoses.
• Fuel pump problems. A faulty fuel pump can cause the engine to stall by not providing enough fuel to the engine.
• Electrical problems. Electrical problems, such as a faulty ignition coil or spark plugs, can also cause the engine to stall.

Diagnosis

To diagnose the cause of an engine that stops when the car comes to a stop, a mechanic will typically start by checking the IACV, TPS, and vacuum hoses. The mechanic may also use a diagnostic scanner to check for trouble codes that can help identify the problem.

Repair

The repair for an engine that stops when the car comes to a stop will depend on the cause of the problem. In some cases, the repair may be as simple as cleaning the IACV or replacing a vacuum hose. In other cases, more extensive repairs, such as replacing the fuel pump or ignition coil, may be necessary.

Prevention

There are several things you can do to help prevent your engine from stopping when you come to a stop. These include:

• Keep your car well-maintained. Regular maintenance can help to prevent problems with the IACV, TPS, and other components that can cause the engine to stall.
• Be aware of the signs of a problem. If you notice that your engine is idling rough or stalling, have it checked by a mechanic as soon as possible.
• Avoid driving in stop-and-go traffic. If possible, avoid driving in stop-and-go traffic, as this can put extra stress on the engine and increase the risk of stalling.

Conclusion

If your engine is stopping when you come to a stop, it is important to have it diagnosed and repaired as soon as possible. Stalling can be dangerous, and it can also damage your engine. By following the tips in this article, you can help to prevent your engine from stalling and keep your car running safely.