1999 Toyota Corolla Engine Diagram Part. This Engine diagram for 1991 Toyota Corolla, there was improvement and restoration of the engine. increased with high-rewing engine 7A-FE 1.8 liter four-cylinder and aluminum DOHC engine that produces 120 horsepower and 122 foot-pounds of torque. The increase in the Toyota Corolla Engine Parts Diagram is to make 10 percent more fuel hemar. These machines can reach up to 31 mpg on city streets and 38 mpg on the highway.