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Must be a fuel problem, since you are getting spark. Can you hear the pump turn on when you turn the key to on? I would check the injector circuit, and if it is working, have the fuel pressure checked-might be too low from a weak or tired pump.
The injectors have a hot wire to them-always hot with key in on position. There's also a fuse for the injectors, as well as a fuse for the fuel pump. The ground wire from injectors goes into the engine computer so it can control injector pulse. A tester called a "noid light" can be used to check the injector circuit. Just plug it into the injector connector and crank the engine over. If the noid light is blinking, the circuit is working right.
didyou replace the manifold heater?
have you checked the relay?have you checked to see if there is actualy power getting to the glow plugs? and also the fuse .
It is very srtange ,if the glow plugs are working ,for it not to fire up straightaway .Does it miss when it does first start?If so, the glow plugs are not all working.Last thing try giving it a squirt of aero start, or starter fluid , if with that ,if it doesn`t start straight away, then you better come back to me as i have another idea what could be a problem but I dont think the glow plugs are working properly so try the aero start first "youdoit"
Have him check the resistance in the wiring when the vehicle is hot. It sounds like a wire is heating up too much and not letting current flow through it properly.
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