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Stalling engine

Question : I DRIVE a 1996 BMW 318i auto and the engine tends to die randomly when the car is stationary.

The engine would judder and sputter.

Upon turning the ignition, the engine would then come alive but only to die immediately again.

The problem started after I changed the car battery.

A day earlier, I changed a valve in the engine after hearing a whistling noise ( like a kettle whistling ) when I drove the car.

The noise went away after the valve change.

The car also had an overheating problem after air bubbles were trapped in the cooling system, which apparently caused the radiator fan to stop operating.

Answer :

This type of engine stalling condition is usually caused by an air leak in the intake system and you will need to check all the hoses from the air-mass sensor to the intake manifold itself.

When there is an air leak, the air-fuel mixture gets too lean and the EFI system cannot compensate sufficiently and therefore the engine stalls.

The original problem may have been the PCV valve but I suspect that in the process of replacing it, some other clamp or hose got dislodged, causing an air leak.

 
 

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