I have a 300tdi auto '98 and it has been getting worse and worse to start lately.
To start it now it has to be cranked for a few minutes! It started off with prolonged cranking from about 10 secs now it seems to be getting longer each time!
This ONLY happens when its left over night or long periods, once started it will be fine all day.
It had new glow plugs about 5 months ago and a new battery last year. It was serviced about a year ago and has only done about 8k since that.
When it does finally start there is LOADS of white smoke out the exhaust as it the glow plugs where not working.
I know the glow plugs are getting power with a 12v tester and are pretty confident that they are not all broken within 5 months. I have had disco's for years now and only ever change 3 glow plugs (leave the one behind the ac pump) and all have worked fine including friends ones.
Could the fuel be draining back?
Please help!
Mark.