Hello all, any ideas for this cold starting problem?
My 52 reg BMW 320TD has developed a cold starting problem this winter. Basically, depending on how cold it is, it can take a long time to get the engine started. Once started no problems until the car is left for while (usually overnight). I've had the car in the dealer twice now and they still haven't resolved it.
First visit, diagnostics reported a couple of glow plug fault codes. They replaced the all glow plugs, and tested the injectors. All fine now they told me. But nothing changed, problem still there.
I noticed that when the car would not start, if I kept turning the ignition on/off, after a while I could hear a slight whirring noise like a pump or fan start, and then the car started straight away.
I took the car back to the dealer, and explained the symptoms. They checked overnight and came to the conclusion the "pre supply" pump (which pumps diesel to the engine ?) was not starting when cold. They replaced it, and again told me everything was fine. You can guess it was not... again.
The car still fails to start easily on cold mornings, but once I hear the faint whirring noise, it starts straight away. So I suspect there might be a relay that switches the pre supply pump which is sticking ? I'd replace it myself if i knew where the relay was?
Does anyone have any ideas ? Regards Jake