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Home >> Toyota >> 1993 >> MR2 2.2 S, Automatic >> Repair and Diagnosis >> Engine Performance >> Remove, Overhaul & Install >> Engine Controls - Remove/Install/Overhaul >> Fuel System >> Fuel Injectors & Fuel Rails >> Installation
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Fuel Injectors & Fuel Rails: Installation

  1. Apply a thin coat of gasoline to NEW "O" rings and install 2 "O" rings onto each injector. Push injector into fuel rail so injector electrical connector is opposite fuel rail cover bolt hole. See Figure.
  2. Install NEW insulator to each injector and install injector cover. Tighten cover screws to 69 INCH lbs. (7.8 N.m). Connect vacuum sensing hose to pressure regulator. Install fuel inlet hose to fuel rail and tighten union bolt to 22 ft. lbs. (30 N.m). Install NEW tip insulator to each injector. Place fuel rail mounting spacers to cylinder head.
  3. Position fuel rail assembly onto cylinder head. Install 3 mounting bolts and tighten to 14 ft. lbs. (19 N.m). Connect fuel return hose to fuel pressure regulator.
  4. Install wiring harness to intake manifold clamps and position harness to mounting bolts on timing belt cover. Connect Gray colored injector connectors to No. 2 and 4 injectors. Connect Brown colored injector connectors to No. 1 and 3 injectors.
  5. To complete installation, reverse removal procedure. Tighten all nuts and bolts to specification. See TORQUE SPECIFICATIONS . After installation complete check for fuel leaks. See CHECKING FOR FUEL LEAKS .


  1. Install NEW grommet to each injector. Apply a light coat of gasoline to NEW "O" ring and install onto injector. Install injectors to fuel rail by turning injector from left to right to bottom injector securely into rail.
  2. Install 4 NEW injector insulators and 2 rail mounting spacers into positions on cylinder head. Install fuel rail/injectors assembly into position on cylinder head and snug tighten the 2 mounting bolts holding fuel rail to cylinder head.
  3. Verify injectors rotate smoothly side-to-side, and check each injector electrical connector is position upward, facing camshaft cover. If injectors DO NOT  rotate smoothly, remove injector and replace damaged "O" rings. Tighten 2 fuel rail mounting bolts to 115 INCH lbs. (13 N.m).
  4. Connect fuel return hose to fuel rail. Connect fuel inlet pipe to fuel rail with 2 NEW gaskets and pulsation damper. Tighten pulsation dampener to 25 ft. lbs. (34 N.m). Connect fuel return hose and vacuum hose to pressure regulator.
  5. Install wiring harness to intake manifold and position to mounting bolts on timing belt cover. Install air intake chamber support and tighten bolts to 31 ft. lbs. (42 N.m). Connect Gray injector connectors to No. 2 and 4 injectors. Connect Brown injector connectors to No. 1 and 3 injectors.
  6. To complete installation, reverse removal procedure. Tighten all nuts and bolts to specification. See TORQUE SPECIFICATIONS . After installation complete check for fuel leaks. See CHECKING FOR FUEL LEAKS .
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