Car Stalling While Driving

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Car Stalling While Driving

Car Stalling While Driving

The car is stalling while driving. The stalling occurs when the engine temperature is high or even when the engine temperature is normal. The reason for this is because of the vapor lock or a faulty fuel pressure regulator.


Possible Cause Why Car Stall While Driving
(1) Vapor lock.
(2) Faulty fuel pressure regulator.


Car Troubleshooting
When the car stalls if the engine temperature is abnormally hot then vapor lock is the usual cause of car stalling. Vapor lock occurs because when the engine is extremely hot the gas will boil before it gets inside the engine. Once the gas is boiling the gas creates air bubbles. The created air bubbles can cause the air/fuel ratio to become lean. When the air/fuel ratio is lean it means that there is too much air and not enough gasoline and when the engine doesn’t have enough fuel then the car will stall.

What to do?
There is nothing you can do when your car encounters a vapor lock. Just wait for the engine to cool down and start the engine again. The real problem here is why is the engine temperature becomes abnormally hot? Probably the engine has a problem on the cooling system, the normal process is when the engine is hot there is a coolant that is circulated around the engine coming from the radiator to cool down the engine, the water serves as a water jacket surrounding the engine but because vapor lock occurs it means that the cooling system is not functioning to cool down the engine.

Engine Cooling System

Has it checked by a mechanic, there might be a leak somewhere in the system, which causes the engine temperature to become abnormally hot.

If the car is equipped with a fuel injection system and also if the car stall even at normal engine temperature then the problem is the fuel pressure regulator. The fuel injection system has a component called the "Fuel pressure regulator", the purpose of this part is to maintain the fuel pressure on each and every fuel injectors, now if the regulator has a problem then the engine will be starved with fuel thus the car will stall.

Fuel Pressure Regulator

What to do?

Bring the car to a reputable shop and have a mechanic check the Fuel Pressure Regulator. If the regulator is faulty just replace it to correct the problem. Replace only the pressure regulator and nothing else this usually fixes the engine stalling while driving.

Related Topics : 

Car Stalls When Idling
Car Stalling While Accelerating
Car Stalls at Idle
Engine Stalls While Driving

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