what is this for?
 

its a 2wd cossie. supposed to be standard but havent got a clue what the plug in does. it connects to the front of the ecu. car had a engine rebuild 3 years ago could they have put it on then and why?

many thanks ben
https://i152.photobucket.com/albums/...n/IMG_1580.jpg
https://i152.photobucket.com/albums/...n/IMG_1579.jpg

Hi,

It's plug what give less spark advance to ECU :
you can obtain - 2° -4° -6° as you like, if you use bad quality benzine.
(92 RON or less.)

Regards

Claude

cheers for your help. got the same answer on another site that it was used for cheap fuel.