How to Replace Fuel Injectors in 1ZZ FE


The 1ZZ-FE is a four-cylinder 1.8-liter engine that is most common on Toyota vehicles made from 1999 to 2005. This engine uses sequential fuel injection, which requires the fuel injectors to deliver fuel to the engine under high pressure. The fuel injectors for a 1ZZ-FE engine are on top of the engine, and are accessible from the engine compartment. The replacement of the fuel injectors in this engine requires the removal of additional engine components.

Things You'll Need

  • Socket wrench set
  • Light machine oil
  • Torque wrench
  • Remove the fuel pump fuse from the fuse box under the dashboard. Start the engine and allow the engine to stall. Crank the engine to ensure the fuel lines are empty and replace the fuel pump fuse. Disconnect the cable from the negative battery terminal to prevent the battery from generating sparks during the fuel injector replacement.

  • Disconnect the cover for the No. 2 cylinder head with a socket wrench. Detach the vacuum hose and fuel tube from the fuel pipe. Disconnect the electrical connectors from the fuel injectors.

  • Disconnect the fuel pipe from the fuel injectors and detach the fuel injectors from the engine. Remove the spacers from the cylinder head and pull the fuel injectors away from the fuel pipe. Discard the O-ring and grommet for the fuel injectors.

  • Coat the new O-rings and grommets with light machine oil before installing them onto the new fuel injectors. Coat the mounting surfaces on the fuel pipe with light machine oil. Install the new fuel injectors into the fuel pipe by twisting them into place so that the electrical connectors face away from the fuel pipe. Coat the injector bores in the cylinder head with light machine oil.

  • Install the spacers and connect the fuel pipe to the cylinder heads. Tighten the mounting bolts for the fuel pipe to 14 foot-pounds with a torque wrench. Attach the fuel line and the PCV hose to the fuel pipe. Connect the cover for the No. 2 cylinder head and tighten its mounting bolts to 7 foot-pounds. Connect the cable for the negative battery terminal with a socket wrench.

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