Hello !

I have a Mitsubishi ASX, 2013,DI-D 2268 ccm, 150HP, automatic gearbox. Engine code, 4N14.
Durring the sumer time, I noticed a tremble, between 1500-1800 rpm and a sound, comming from engine compartment.
I was going with the car in holiday and I started the trip at 3:00 AM. Till 12:00 PM, the outside temperature did not exced 25 degree.
When the outside temperature exceded 30 degree, same symptoms, tremble and that noise. And the tremble seams to me a little harded.
I noticed that the rev goes up and down. And also, when diesel particulate filter make regeneration, the tremble and sound disapear.
All this things happened when the car is in Drive. In neutral, no signs of tremble or sounds. Also, when I drive the car short distances, maximum 50 km, I dont feel anything.

 

Check out the following link from the Outlander Sport forum (posts #25 similar question as yours and #25 potential cause):
OS forum relevant posts