Over the last month or so my diesel 2.0 140ps tdi Touran seems to have developed a occasional shudder through the driveline when driving on very light throttle (which I appeciate is a nonsense with a diesel but you know what I mean).
It usually occurs around 1400 rpm almost on the point of being on full over-run and then the engine seems to misfire or something, causing a bit of drive train shunting. It's not something I've ever experienced on a diesel. It's more pronounced when the engine is cold but can occur anytime..
It's almost as if the fuel cut-off is cutting in prematurely. It's been hooked up to the main dealers computers but they're not reading any fault codes.
The car recently had a routine service where the wrong engine oill was used (15w/40) but this was changed for the correct stuff a few days later so I don't think this can be a factor.
FWIW its a DSG auto but I doubt this makes any difference.
Anyone come across anything similar?
Tim