Hi all, i recently bought a cabriolet which has a 2.5v6 tdi. the car drives great, no issues apart from starting it. basically the problem is: first thing in the morning the car starts fine. The glow plug light stays on for 5-10 seconds. One cycle and car starts. HOWEVER, if I drive for half hour, switch it off and come back within the next few hours, when I start it the glow plug light only stays on for a second. And car doesn't start straight away.. Chugs after 5-6 turns it starts bits smokes white initially. ive removed all glow plugs and checked em, there all fine. Is there something that controls the cycle duration of the glow plugs? maybe temperature related as the issue is not warming plugs if the cars warm.?? PLEASE HELP..