Shop is inside this building where I saw the machinery cleaning the injectors. Since, time I saw, I did not had a good knowledge about the subject so never inquired anything from them. They were basically doing something with diesel vehicles but I think it can also be used for petrol cars.
Today, around 10:00 p.m while I was driving on Peshawar road so located the same building. On Outside board it was written “Khan Diesel Laboratories” with Phone number: 03225141249. You can call and ask if they do injector cleaning for Petrol Vehicles or if there is a shop nearby which does.
Following are the latitude and longitude, just insert them in google Earth or google maps it will take you there.
33.614519n, 72.995626e