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X5 04 diesel cold start problem
Could anyone help orientate to my new mystery. When temperature drops to below freezing, car won´t start. Preheat signal comes on, start motor turns OK, but engine does not fire. When I connect engine heater on for half an hour, car starts OK. Fuel filter is about one yr old, but low miles. Diesel Fuel is "new" and rated for -18 Celsius.
Have noticed during the summer that car needed a bit more start motor rotations before it starts, so something slow has been happening.
Thx in advance
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