I have a 1996 BMW E34 525TDS and it is starting to become difficult to start when cold. Cold as in properly cold, from over night.
The problem came around when we had a very cold spell (sub-zero temps over night). It seems to be temperature related, as when the temps aren't so low its not so hard to start.
To get it going most time I either have to crank it a lot, like 30 secs+ and it finally splutters into life in a big cloud or I have to turn the ignition on and off several times to let the glow plugs go on and off many times, trying to get some heat in there.
But it seems to be getting worse.
Could it be my glow plugs - How can I check them?
Could it be more serious - loss of compression?
Or maybe a fuel pump problem, i.e. the 'lift' pump in the fuel tank I have read causes a lot of issues like this, but I am not sure whether this is my case as once there is a bit of heat in there, it will start on the button.
Thanks in advance.