I got an official VAG PDF of how the PD system works (60+ pages with pretty pictures) from a link on Briskoda, if anyone wants a copy (or if anyone wants to host it for downloading) please PM me with your email addy.
All sorts of good stuff in it, for example the glow plugs continue to preheat long after the warning light has gone out, and keep preheating below 2500rpm and until the coolant temp reaches a preset limit ....
All sorts of good stuff in it, for example the glow plugs continue to preheat long after the warning light has gone out, and keep preheating below 2500rpm and until the coolant temp reaches a preset limit ....