How to Install Injectors on a Toyota 3RZ-FE Engine

The Toyota 3RZ-FE engine is a four-cylinder, 2.7-liter engine that Toyota typically used in late-model trucks. This engine is common in the Toyota Tacoma four-wheel drive pickup truck, which was made from 1995 to 2004. The fuel injectors on the 3RZ-FE engine are part of the fuel rail assembly, which is on top of the engine. The installation of the fuel injectors therefore requires the removal of the fuel rail.

Difficulty:

Challenging

Instructions

things you'll need:

• Socket wrench set
• Gasoline
• Torque wrench

1. • 1

     Disconnect the cable for the negative battery terminal with a socket wrench to prevent electrical shocks. Remove the cover for the relay block in the engine compartment and disconnect the circuit opening relay in the relay block. Connect the negative battery terminal and start the engine.

   • 2

     Allow the engine to stall and turn the ignition switch on. Crank the engine to ensure that the fuel system is empty. Remove the cap on the fuel tank cap to relieve the pressure in the fuel tank. Install the circuit opening relay.

   • 3

     Remove the cable from the negative battery terminal with a socket wrench. Disconnect the throttle body from the engine block with a socket wrench and detach the electrical connectors for the fuel injectors. Disconnect the connectors for the crankshaft position sensor, knock sensor and data link connector.

   • 4

     Disconnect the vacuum line and fuel return line from the fuel pressure regulator. Remove the union bolt and its gaskets from the fuel rail with a socket wrench. Detach the fuel inlet pipe from the fuel rail and pull the fuel rail from the engine block with the fuel injectors still attached.

   • 5

     Remove the insulators and spaces from each fuel injector and discard them. Detach the fuel injectors from the fuel rail. Discard the O-rings and grommets for the fuel injectors.

   • 6

     Lubricate the new O-rings and grommets with gasoline and mount them onto the fuel rail. Install the new fuel injectors to the fuel rail so that the the electrical connectors face up. Install the new insulators and spacers onto the intake manifold.

   • 7

     Complete the installation of the fuel injectors by performing Steps 3 and 4 in reverse order. Torque the bolts that attach the fuel pipe to the intake manifold to 15 pound-feet with a torque wrench. Tighten the union bolt on the fuel rail to 22 pound-feet.