bedford4x4 wrote:I don't know if you're still having trouble with your cold starts.
I had exactly the same trouble with my truck.
The issue is not the cold start system at all. The issue is injector timing, normally because the crankshaft sprocket for the timing belt is slogged out. This retards the timing, which means that the motor doesn't want to start. When you disconnect the wire on the thermostat, you are forcing the glow-plugs to come on for longer, true, but what causes the engine to start better is that by disconnecting that wire, the injector pump timing gets advanced for better cold-starting. This brings the timing back to somewhere approaching normal.
I would strongly recommend investigating the crankshaft sprocket. This is well-known for coming loose on these motors, often because ignorant mechanics don't torque them up to the right torque setting after changing timing belts.
The 2.8TD doesn't generally need glow-plugs. The cold-start system activates at about 0 degrees C., or below.
Regards,
Harry
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