pump, and use of a more restrictive exhaust system that reduced maximum power. The original base transmission in the gasoline fueled Tempo/Topaz is a four-speed IB4 manual that made up part of what Ford called the "Fuel Saver" powertrain. A five-speed MTX-III manual or a three-speed FLC automatic were optional upgrades. From 1984 to 1986 a version of Mazda's four-cylinder RF diesel engine was offered in the Tempo and Topaz. The only transmission paired with the diesel engine was the 5-speed manual. All Wheel Drive An optional All Wheel Drive (AWD) system became available in the Tempo and Topaz in 1987, and was offered until 1991. Although Ford had a long history with four wheel drive, and had built prototypes based on other car models before, the AWD Tempo was their first production passenger sedan to offer four wheel drive. This design of part-time system is not meant for serious off-road driving, nor for use on dry streets. It is designed specifically to provide additional traction in slippery road conditions. The system is controlled by a rocker switch in the interior. When activated, the system engages a clutch which sends power to a limited-slip rear differential via a new driveshaft. There is no transfer case. The all-wheel-drive system adds to the weight of the car, and increases ride height by just . The only engine offered with the AWD option was the HSO four cylinder, with the 3-speed automatic transmission. In 1991 Ford started referring to the system as "Four Wheel Drive" instead of All Wheel Drive. First generation (1984–1987) The first generation Tempo and Topaz were unveiled on the deck of the USS Intrepid, a decommissioned aircraft carrier that had been turned into a floating museum in New York Harbor. They were released on 26 May 1983 as 1984 models. An early advertisement for the car featured a Tempo sedan performing a 360 degree loop on a stunt track. The car in the ad was securely attached to a track, and was pulled through the shot rather than operating under its own power. As Ford's first downsized compact car, the Tempo arrived four years after GM's compact X-Bodies in 1979 for the 1980 model years, and two and a half years after Chrysler's compact K-cars were introduced. The four door Tempo had three windows in profile, somewhat similar to the European Ford Sierra, while the four-door Topaz received a