A glow plug is a small heating element in the cylinder. It heats the diesel so that starting can be made easy. Is your car standing in the open frozen parking If yes, then it would require a lot of battery power to first heat all the cylinders and then turn the engine to start. What we do in such conditions is to light up some fire under the car and heat the fuel system enough for the diesel to warm up a little and thus save the battery for glow plugs. Generally, all vehicles have an indicator light which comes on when the glow plugs are ready for starting. The diesel will ignite on compression, but it has to reach the cylinder and thus has to be flowing. In cold it freezes and hence the need for glow plugs and the heat. If it is parked in heated parking then the need for glow plugs decreases.
Presuming it is swinging (starter turning engine) and the
glow plugs are working well and diesel is clean, the other alternatives are a
drop in fuel pressure through the injectors which is necessary to ignite the
diesel, or engine compression. If the compression is too low the diesel will
not ignite. Test the injectors and
compression across al cylinders. Being a turbo the compression si already lowered and the slightest drop will have an effect. Happy hunting.
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