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How to Replace Fuel Injectors in a Quad Four

The Quad 4 series of engines by General Motors had four cylinders with four valves per cylinder. They were in production from 1987 to 2002, and appeared in various GM vehicles from this period. The 2.4-liter version of the Quad 4 engine was an option on the Chevrolet Cavalier from 1996 to 2002. The procedure for replacing the fuel injectors is generally the same for all Quad 4 vehicles.

Instructions

1

Open the filler cap on the fuel tank to relieve the pressure in the fuel tank, and disconnect the electrical connector from the fuel pump. Start the engine, and allow it to idle until it stalls.

2

Crank the engine for three seconds at a time until the engine fails to start. This ensures that the fuel system is completely empty. Remove the negative battery cable with a socket wrench. Attach the electrical connector for the fuel pump, and fasten the filler cap to the fuel tank.

3

Disconnect the resonator for the air cleaner with a socket wrench, and detach the fuel lines from the fuel injectors. Disconnect the electrical connectors for the camshaft position sensor and the fuel injectors. Detach the vacuum line from the fuel pressure regulator.

4

Disconnect the mounting bolts for the fuel rail with a socket wrench, and remove the fuel rail from the intake manifold. Twist the fuel pressure regulator back and forth to detach it from the fuel rail, and discard the O-ring on the fuel pressure regulator. Release the retaining clips from the fuel injectors, and remove the fuel injectors from the fuel rail.

5

Coat the new O-rings for the fuel injectors with engine oil, and mount them to the new fuel injectors. Install the new fuel injectors to the fuel rail, and attach the retaining clips to the fuel injectors. Connect the fuel rail to the intake manifold, and tighten its mounting bolts to 18 foot-pounds with a torque wrench.

6

Mount a new O-ring to the fuel pressure regulator, and install the regulator to the fuel rail. Tighten the mounting bolts for the fuel pressure regulator to 53 inch-pounds with a torque wrench.

7

Attach the fuel lines to the fuel injector, and plug the electrical connector into the fuel injector. Connect the vacuum hose to the fuel pressure regulator, and attach the electrical connector for the camshaft position sensor. Install the resonator for the air cleaner with a socket wrench.

8

Connect the cable for the negative battery terminal with a socket wrench. Turn the ignition switch on for two seconds, then turn the ignition off for ten seconds to pressurize the fuel system. Check the vehicle for fuel leaks.