What are the reasons for a diesel engine failing to restart after stalling?
2 Answers
Diesel engine failing to restart after stalling is mainly due to the engine temperature being too low. As long as the engine is kept warm and the biting cold wind is prevented from directly blowing into the engine compartment, the issue of failing to start can be avoided. Choosing the right parking location: When parking in winter, pay attention to the direction of the front of the car. It is best to park the front of the car facing a building to use the building as a windbreak, preventing the engine from being too cold due to the cold wind. When parking at night, you can face the front of the car towards the direction of the morning sun, allowing the first rays of sunlight in the morning to shine on the front of the car, helping the engine to warm up. This makes starting the car much easier. Engine stalling when shifting gears: This may be due to the idle speed being too low at the time, or the idle speed cut-off valve not being tightened, or it could be due to the gear being too high causing the engine to stall. Another possibility is that the oil-gas separator is severely clogged.
I've been driving diesel vehicles for over a decade and often encounter this issue. The engine fails to start after shutting down, most commonly due to fuel system malfunctions. Diesel engines require high-pressure fuel for ignition, so the fuel pump might be damaged or the fuel filter clogged. In older vehicles that have been driven for a long time, filters accumulate a lot of dirt, which can cause the engine to seize upon restarting after shutdown. Insufficient fuel can also be a culprit, as fuel gauges sometimes inaccurately display levels, and refueling often resolves the issue. Additionally, a weak starter battery can prevent the engine from starting, especially in winter or when the battery is aging, so regular battery maintenance is essential. Problems with fuel injectors or intake sensors can also arise, as dust buildup may cause blockages. Last time my car had the same issue, it turned out the air filter was dirty, and cleaning it solved the problem. I recommend regular maintenance, such as replacing fuel filters and checking battery lifespan, to avoid breakdowns on the road.
