Hi there,

In hope someone can help me out.

Problem:-

Whilst test driving my car run perfect tank almost empty went straight to garage and put £20 diesel in on dual garage way doing a steady 60 ever few 30 seconds the revs would drop and keep doing it, I could here something like a suction from front left side of car under bonnet its seems to do this when trying to cruise its fine on acceleration and tick over no smoke its a little jerky when going from 2nd to 3rd also please help its an automatic as well

 

I've moved your question from Jaguar Forums Advice / Feedback & Suggestion Center to S-Type forum. Members here with the same model will be able to help.

(the Advice / Feedback forum is for posts about the forum and not for tech questions.)

Graham

 

1ST thing is to check for any codes, you might be better asking on the uk. Forum as up diesels in USA