when exhaust emission regulations took force in Mexico. FFV From 1993 to 1995, a multipoint fuel injected non-turbo version of the 2.5 engine was installed in flexible-fuel Dodge Spirits and Plymouth Acclaims. This engine and its fuel supply and computerized management system were specially modified to run on fuel containing up to 85% Methanol. Most of the MPFI system was common with the Mexican-market 2.5 MPFI engine. Modifications included upgraded seal and gasket materials, chrome piston rings, stainless-steel fuel system components, sion fuel injectors internally plated with nickel, and fuel composition sensors. MPFI From 1991 to 1995 in the Mexican market, multipoint fuel injected, non-turbo version of the 2.2 and 2.5 were installed in many Chrysler Corporation vehicles. This version of the 2.5 was rated at , and in most cases lacked the balance shafts used in all other versions of the 2.5. The MPFI system gave better driveability, performance and fuel economy, and cleaner emissions, but was nevertheless not used elsewhere than the Mexican domestic market and Chrysler de Mexico's export markets. Engine computers Various kinds of Engine Control Units were used with the 2.2 and 2.5 engines. From 1984–1987, the ECU was divided into the Logic Module (LM), which was inside the passenger cabin, and the Power Module located near the battery on the left front fender. The LM used a Motorola 6803U4 processor operating at 1 MHz, with 256 bytes of RAM and either two 8K EPROMs or one 16K EPROM. From 1988–1989, a SMEC (Single Module Engine Controller) was used. This was a complete redesign of the older system, using modern CAD for board design, and higher density SMD components. The processor was a 68HC11 operating at 2 MHz with 256 bytes of RAM and a 32K EPROM. Functionally, the SMEC was the combination of the earlier Logic and Power modules into one unit. Starting in 1990, a more advanced SBEC (Single Board Engine Controller) was used, which integrated the earlier two board computer into a single board. See also List of Chrysler engines References Chrysler engines