Codenamed DE-1 during its development (since it was intended to straddle the European D and E segments), the Scorpio was heavily based on the Sierra, sitting on a stretched version of its floorpan, and using a similar styling philosophy set by both the Sierra and the third generation Escort. Under the bonnet were well-proven engines, starting with the venerable Pinto engine unit in 1.8 L and 2.0 L capacities, as well as the V6 Cologne engine in 2.4 L, 2.8 L, and later 2.9 L displacements. By the summer of 1989 the Pinto engines had begun to be gradually replaced, with an 8-valve DOHC engine replacing the 2.0 L model.