Hi everyone, Is there any technical difference between MJD, DDis and Quadrajet? Fiat engines are used in Swift, Vista also but branded differently. Tech specs remain the same. But Swift, Vista engines emit smoke when floored but not Fiat. Why? Is the configuration different with the pump? Quadrajet, used by Vista, means four does that mean pump is programmed to spray 4 times in a stroke, like wise DDiS is used by Swift where D is the fourth letter in alphabet suggesting again 4 sprays in a stroke. How many times does it spray in engines used by Fiat as it says MJD? What kind of technology is used by fiat engines as they do not emit any smoke?