Diesel "judder" at low speed/low throttle

[Scarletpimpofnel]

I have a 2.2liter 4cyl diesel automatic Jaguar XF as a daily. It runs very well with 50mpg and has 120,000 miles on the clock.

I generally put Shell premium diesel in it in the hope that keeps the injectors etc clean.

The issue I have is that if travelling slowly say 20mph on very low throttle low load I get a judder (what I'd describe as pinking/pre-ignition if it was a petrol car of years ago). The judder isn't violent but enough to not feel good and probably putting strain on the entire drive train.

Anyone have any idea what is causing this and how to rectify?

(PS Most of my journeys are long at 50-70mph with few stops so DPF etc should be clean, no warning lights etc lit). TIA.

[E-bmw]

It is a low revving 2.4L 4-pot diesel, the power strokes will be VERY severe at low revs.

You say it is an auto, try forcing it into a lower gear, likely that will help.

[Scarletpimpofnel]

It could be that I will give it a go with the paddle gear shifters. Thanks.

[E-bmw]

Not sure if the same is true for an auto, as I don't "do" autos but just for comparison my 6 speed 1.6D V40 wants me to be in 4/5 at 30 but there are 2 issues with this.

1. The revs are in the 100's & it is lumpy as hell.

2. You actually have no control of the car in such a high gear for such a low speed. Hills either kill the car or make it speed away (depending if going up or down) also there is no economy improvement.