Car stalling: Why it happens and how to avoid it

Read our know how guide to learn more.

Although most drivers will have experienced a stalled engine, there are several reasons why it might happen.

A common issue is that there might not be enough fuel in the tank, or there could be a clogged fuel filter that will restrict the flow of fuel to the engine.

Also, if the fuel pump isn't working correctly, it won't supply the engine with the necessary fuel to power the vehicle – causing the engine to stall.

A clogged air filter will also have a similar effect. Restricted air flow is a common issue with stalling engines.

When turning on the engine, a worn or damaged spark plug can cause engine misfiring and stalling.

This is also the case with a faulty ignition coil.

Looking at more technical causes for engine stalling, a faulty Mass Air Flow (MAF) sensor can cause the engine to run poorly and stall.

There are also several other sensors and wiring linked to the engine and starting a car, which can also lead to an engine stalling.

These are all linked to the car battery. If it isn’t supplying enough power, the car may stall, especially if there are other electrical issues present.

Finally, and arguably the most common reason for stalling – human error.

A car can most commonly stall when the driver is pulling away from a standstill but incorrectly operating the clutch – such as releasing it too quickly or not applying some throttle when pulling away.

Changing into too high a gear can also labour the engine, causing it to judder and eventually stall if the speed drops.

These are common issues seen with learner drivers.

Some cars are easier to stall than others, but a worn clutch or flywheel can also make the issue worse. It’s worth a visit to the garage if you think your car stalls too easily.

Should you stall the engine while you're driving, the first thing you should do is stay calm and put your hazard warning lights on.

This will alert other drivers that you're having trouble and should ensure they give you space.

Remember, the safety of yourself, your passengers and other road users is the most important thing when stalling your engine.

Once you are ready, make sure the car isn’t in gear and try to attempt to restart the engine. If the car starts up again, keep an eye on the dashboard for warning lights and listen for any unusual sounds.

If there are no issues, you can then indicate and continue your journey.

Otherwise, if there is a problem with the car, call for your breakdown provider.

• What causes a loss of power in a car?
• Driving habits that damage your car
• Engine idling – why is it so harmful to your car?

Car stalling happens when an engine suddenly stops running.

This can happen when the vehicle is in motion or when idling.

When a car stalls, the engine shuts off unexpectedly, and the car will often lose power, making it difficult to steer and brake effectively.

Stalling can happen for several reasons, usually related to the engine’s ability to maintain a smooth and consistent flow of air, fuel, and electrical power. It often happens due to human error, however.

In most cases, occasional car stalling won’t cause significant damage to your engine or anything else on the vehicle.

However, if the stalling is frequent or goes unchecked over time, then it could lead to issues.

If your car rarely stalls, then you may just need to address the small issues, such as replacing spark plugs and filters – or just check that you low fuel.

These will may also be checked during your annual car service.

Drivers whose engine stalls repeatedly, is likely due to a more serious problem.

This is because it can put stress on certain engine components. Engines are sturdy enough to deal with the pressure of this happening but it is a contributing factor to general wear and tear.

For example, if your car stalls frequently and you have to keep restarting it, this could put unnecessary strain on the starter motor, potentially leading to premature wear or failure. It will also likely drain the car battery.

Similarly, transmissions are designed to cope with frequent engine stalling, but extreme cases – such as using your car for driving instruction – can cause premature wear.

No matter what the issue is, it is important to diagnose it as soon as possible and fix the root cause of the stalling.

If you're experiencing stalling often, it’s a good idea to have your car checked out by a mobile mechanic or visit your trusted local garage.