Car Stalling While Driving

Car is stalling while driving. The stalling occurs when the engine temperature is high or even when the engine temperature is normal.


Possible Cause Why Car Stall while Driving


Vapor Lock

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 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 don’t have enough fuel then the car will stall.

Free Car Diagnostic Recommendation
There is nothing you can do when your car encounter 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.

Have it check by a mechanic there might be a leak somewhere in the system which cause the engine temperature to become abnormally hot.

Faulty Fuel Pressure Regulator

This problem is possible when the car is equipped with fuel injection system and also if the car stall even at normal engine temperature. Fuel injection system have a component called the Fuel Pressure Regulator, the purpose of this parts is to maintain the fuel pressure on each and every fuel injectors, now if the regulator have problem then engine will be starved with fuel thus the car will stall.

Free Car Diagnostic Recommendation
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 fix the engine stalling while driving.

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