Engine turning over quite fast same speed as when I got the car in 2007. When hot starts pretty good no problems.

Thanks

Glow plugs are very unlikely to be the cause of the problem. You either have a loss of compression or loss of fuel pressure. For the fuel injectors to pulse and the engine to start the pressure in the common rail must reach at least 10,000kpa, which is 100 bar or 1450psi. A worn high pressure fuel pump or excessive injector leak off would cause your problem.

Your engine is a direct injection common rail diesel, and these do not require preheating except for when the outside air temperature is very cold, such as freezing or just above that. In fact the purpose of glow plugs isn't even for cold starting, rather than to reduce engine noise and to improve emissions when the engine is cold.

Glow plugs were required for cold starting on older indirect injection diesels, but as far as I'm aware no indirect injections are common rails.

Hi, thanks for this comment, in your opinion what would your next logical step be ? Im thinking paying for a compression test OR getting the fuel injectors reconditioned ??

Thank you

A quick easy test is to locate the fuel filter housing beneath the engine cover. It's black, circular and about 6" in diameter. Get an assistant to switch the ignition on and off, but do not crank the engine. Whilst he is doing so you should see the filter housing swell slightly and ease back. This will tell you if the in-tank fuel pump is working as it should do. Common rail fuel pressure can be checked using suitable diagnostic equipment which as I said before must reach at least 10,000kpa on cranking before the engine will start, but it should be remembered that the rail pressure reading is what the sensor is telling the ECU, not the actual pressure in the rail, which could be different if the sensor is faulty. Pumps do not create pressure. They facilitate flow. Pressure comes from opposition to flow. The pressure in the common rail will be reduced if too much fuel is allowed to return to the tank from one or more injectors. Apart from removing the fuel return pipes to measure the quantity of fuel leaking off, do not attempt to do anything to the fuel injectors. They are expensive and could easily be damaged if you tamper with them. A diesel fuel injection specialist should be able to do these checks for you, and re-condition your injectors if necessary.