Our 2014 SD4 often produces a constant high pitched sound coming from somewhere near the front of the engine after turning the engine off. It sounds electrical rather than mechanical to me. Today I was outside and it is still making the sound some 20 minutes after stopping the engine. Anyone know what it is and why?

My TD5 discovery did something a bit similar, but that was the centrifugal oil filter spinning down and had a decreasing pitch as the spinning thing slowed to a stop. Jules

its the throttle body motor re setting itself, it its starts to click too then its on its way out.

Search on here using throttle +body and loads of threads will appear

Paul

Thanks Paul.

Interesting, I didnt think diesels had throttle bodies, only petrols. What does it do, as diesels dont have throttles per se? Is it just a air flow meter ?

I'll do a search?

Meanwhile my BMW diesel has an airway flow meter (hot wire ) but its silent. So what is making the sound in the SD4?

UPDATE - Having done a quick search I clearly dont know how modern diesels match fuel and air flow - will need to gen up.  Jules

It's the electronic throttle valve. It's job is to stop air going to the engine, this is used to stop the engine smoothly. When mine stopped working the engine vibrated when comming to a stop after being turned off. Black MY2013 SD4 GS Auto, Wood Company Armrest, Freel2 sticker.
Gone MY2010 Freelander 2 Manual TD4.e S, Alaska White.

taztastic wrote:

its the throttle body motor re setting itself, it its starts to click too then its on its way out.

Search on here using throttle +body and loads of threads will appear

Paul

This is all very interesting but what is actually making the noise and why is it so loud and going on for so long ? Jules