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Forum members often point to
sensor. Worth while checking sensor but your symptoms point to 2 things: Coolant temperature sensor and injection pump timing. Glowplug preheat time is variable but light on dashboard should go out after 2 seconds when coolant temperature is above 10C. The engine should start easily without the glowplugs if engine is in good condition and not too cold. Have a read of post 7 & 8 of this thread.
These posts explain how to measure injection timing on your engine if equipped with a Bosch pump.
Currently in tolsen's garage:
Trekka 1.9 DCI, Smart Cabrio Cdi (65 - 85 MPG) & Ford Transit 2.2 Duratorq TDCi
Last edited by Pat.w; 13th October 2009 at 10:57 PM.