The Pontiac Sunfire is a compact car, manufactured by Pontiac from 1995 to 2005. This vehicle uses Pontiac's J platform, and has a four-cylinder 2.2-liter engine with sequential fuel injection. Each cylinder has its own fuel injector, which delivers pressurized fuel to the cylinder in a precise sequence. The fuel injectors are generally not serviceable, so the repair procedure consists of replacing the faulty injectors.
Disconnect the cable from the negative battery terminal with a socket wrench to avoid the discharge of fuel while installing the fuel injectors. Open the filler cap on the fuel tank to relieve the pressure in the fuel tank.
Wrap a shop towel around the fuel pressure port on the fuel rail to soak up fuel leaks. Connect a fuel pressure gauge to the fuel pressure port and place the free end of the pressure gauge's bleed hose into a gasoline container. Open the valve on the pressure gauge to relieve the pressure in the fuel system. Disconnect the fuel pressure gauge from the fuel pressure port.
Disconnect the outlet resonator of the air cleaner with a socket wrench. Detach the fuel lines from the fuel rail and unplug the electrical connectors for the fuel injectors. Disconnect the mounting bolts for the fuel rail and remove the fuel rail from the cylinder heads.
Release the retainer clip on the fuel injectors and remove the fuel injectors from the fuel rail. Remove the O-rings from the fuel injector and discard them.
Mount the new O-rings to the fuel injectors and attach the fuel injector clips. Install the fuel injectors into their corresponding sockets on the fuel rail so the electrical connectors face upward.
Align the fuel injectors with their respective cylinder head ports and install the fuel rail to the cylinder heads. Tighten the retainers for the fuel rail to 89 inch-pounds with a torque wrench.
Attach the electrical connectors to the fuel injectors. Connect the fuel lines to the fuel rail and connect the vacuum hose to the fuel pressure regulator. Install the outlet resonator for the air cleaner with a socket wrench.
Connect the cable to the negative battery terminal. Turn the ignition on for two seconds to pressurize the fuel system. Turn the ignition off and check for fuel leaks.
