How to Change the Fuel Injectors on a 1987 Mazda RX-7

The RX-7 is a sports car manufactured by Mazda from 1978 to 2002. The 1987 model is a second generation RX-7, which includes the 1986 through 1988 model years. The standard engine in the 1987 Mazda RX-7 was a naturally aspirated 1.3-liter engine with fuel injection. The fuel injectors are accessible from the engine compartment, but you will need to remove the throttle body from the engine to access the fuel injectors.

Tools Used: Socket wrench set, Shop towels

Change the Fuel Injectors

Start the engine and disconnect the electrical connector for the fuel pump. Wait for the engine to stall, and then turn the ignition switch off. Disconnect the cable to the battery's negative terminal with a socket wrench. This will prevent the accidental discharge of fuel while you replace the fuel injectors. Replace the electrical connector for the fuel pump.

Disconnect the accelerator cable from the throttle linkage with a socket wrench. Detach the cruise control cable and air funnel from the vehicle. Cover the fuel lines to the throttle body with a shop towel to catch spilled fuel. Disconnect the fuel lines and plug the open ends of the fuel lines with shop rags.

Detach the electrical connector for the throttle position sensor connector. Disconnect the rod for the oil pump with a throttle-actuating lever with a socket wrench. Remove the retaining screws for the throttle body assembly and detach the throttle body assembly from the dynamic chamber.

Disconnect the fuel line and fuel pipe from the fuel injectors with a socket wrench. Remove the electrical connectors for the fuel injector and disconnect the pressure regulator. Disconnect the distribution pipe from the fuel injector and remove the fuel injector from the vehicle. Discard the O-rings for the fuel injector.

Install the new fuel injectors and O-rings by performing Steps 2 through 4 in reverse order. Connect the cable to the negative terminal on the battery with a socket wrench. Turn the ignition on for a few seconds to pressurize the fuel system. Start the engine and check for fuel leaks.

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