Fuel Injector

REMOVAL & INSTALLATION

1.5L, 1.8L, And 2.0L SOHC Engines

1. Relieve the fuel system pressure as described in this section.
2. Remove or disconnect the following:
   • PCV hose from the valve cover
   • Breather hose at the opposite end of the valve cover
   • High pressure fuel line

   CAUTION
   Observe all applicable safety precautions when working around fuel. Whenever servicing the fuel system, always work in a well ventilated area. Do not allow fuel spray or vapors to come in contact with a spark or open flame. Keep a dry chemical fire extinguisher near the work area. Always keep fuel in a container specifically designed for fuel storage; also, always properly seal fuel containers to avoid the possibility of fire or explosion.

3. Remove or disconnect the following:
   • Vacuum hose from the fuel pressure regulator
   • Fuel return hose from the pressure regulator
   • Electrical connector from each injector. Label for reference
   • Bolt(s) holding the fuel rail to the manifold. Carefully lift the rail up and remove it with the injectors attached. Take great care not to drop an injector. Place the rail and injectors in a safe location on the workbench; protect the tips of the injectors from dirt and/or impact.
   • Injector insulators from the intake manifold, discard. The insulators are not reusable.
   • Injectors from the fuel rail by pulling gently in a straight outward motion. Make certain the grommet and O-ring come off with the injector.

   To install:

4. Install a new insulator in each injector port in the manifold.
5. Remove the old grommet and O-ring from each injector. Install a new grommet and O-ring; coat the O-ring lightly with clean, thin oil.
6. If the fuel pressure regulator was removed, replace the O-ring with a new one and coat it lightly with clean, thin oil. Insert the regulator straight into the rail, then check that it can be rotated freely. If it does not rotate smoothly, remove it and inspect the O-ring for deformation or jamming. When properly installed, align the mounting holes and tighten the retaining bolts to 84 inch lbs. (9 Nm). This procedure must be followed even if the fuel rail was not removed.
7. Install or connect the following:
   • Injector into the fuel rail, constantly turning the injector left and right during installation. When fully installed, the injector should still turn freely in the rail. If it does not, remove the injector and inspect the O-ring for deformation or damage.
   • Delivery pipe and injectors to the engine. Make certain that each injector fits correctly into its port and that the rubber insulators for the fuel rail mounts are in position.
   • Fuel rail retaining bolts and tighten them to 108 inch lbs. (12 Nm)
   • Wiring harnesses to the appropriate injector
   • Fuel return hose to the pressure regulator, then connect the vacuum hose
8. Replace the O-ring on the high pressure fuel line, coat the O-ring lightly with clean, thin oil and install the line to the fuel rail. Tighten the mounting bolts.
9. PCV hose and the breather hose
10. Negative battery cable
11. Pressurize the fuel system and inspect all connections for leaks.

1.6L and 2.0L DOHC Engines

1. Relieve the fuel system pressure as described in this section.
2. Disconnect the negative battery cable.
3. Wrap the connection with a shop towel and disconnect the high pressure fuel line at the fuel rail.

   CAUTION
   Observe all applicable safety precautions when working around fuel. Whenever servicing the fuel system, always work in a well ventilated area. Do not allow fuel spray or vapors to come in contact with a spark or open flame. Keep a dry chemical fire extinguisher near the work area. Always keep fuel in a container specifically designed for fuel storage; also, always properly seal fuel containers to avoid the possibility of fire or explosion.

4. Remove or disconnect the following:
   • Fuel return hose and remove the O-ring
   • Vacuum hose from the fuel pressure regulator
   • PCV hose. On 2.0L engine, remove the center cover
   • Electrical connectors from each injector, label for reference
   • Injector rail retaining bolts. Make sure the rubber mounting bushings do not get lost.
5. Lift the rail assembly up and away from the engine.
6. Remove the injectors from the rail by pulling gently. Discard the lower insulator. Check the resistance through the injector. The specification for 2.0L turbocharged engine is 2–3 ohms at 70°F (20°C). The specification for the others is 13–15 ohms at 70°F (20°C).

   To install:

7. Install or connect the following:
   • New grommet and O-ring to the injector. Coat the O-ring with light oil.
   • Injector to the fuel rail
8. Replace the seats in the intake manifold. Install the fuel rail and injectors to the manifold. Make sure the rubber bushings are in place before tightening the mounting bolts.
9. Tighten the retaining bolts to 72 inch lbs. (11 Nm).
10. Install or connect the following:
    • Connectors to the injectors and install the center cover
    • PCV hose
    • Fuel pressure regulator vacuum hose
    • Fuel return hose
11. Replace the O-ring, lightly lubricate it and connect the high pressure fuel line.
12. Connect the negative battery cable and check the entire system for proper operation and leaks.

2.4L Engine

1. Relieve the fuel system pressure as described in this section.
2. Label and disconnect the spark plug wires. Position the wires aside.
3. Remove or disconnect the following:
   • PCV hose from the valve cover
   • High pressure fuel line to the fuel rail and disconnect the line. Be prepared to contain fuel spillage; plug the line to keep out dirt and debris.

   CAUTION
   Observe all applicable safety precautions when working around fuel. Whenever servicing the fuel system, always work in a well ventilated area. Do not allow fuel spray or vapors to come in contact with a spark or open flame. Keep a dry chemical fire extinguisher near the work area. Always keep fuel in a container specifically designed for fuel storage; also, always properly seal fuel containers to avoid the possibility of fire or explosion.

4. Remove or disconnect the following:
   • Vacuum hose from the fuel pressure regulator
   • Fuel return hose from the pressure regulator
   • Electrical connector from each injector, label for reference
   • Bolt(s) holding the fuel rail to the manifold. Carefully lift the rail up and remove it with the injectors attached. Take great care not to drop an injector. Place the rail and injectors in a safe location on the workbench; protect the tips of the injectors from dirt and/or impact.
   • Injector insulators from the intake manifold, discard. The insulators are not reusable.
   • Injectors from the fuel rail by pulling gently in a straight outward motion. Make certain the grommet and O-ring come off with the injector.

   To install:

5. Install a new insulator in each injector port in the manifold.
6. Remove the old grommet and O-ring from each injector. Install a new grommet and O-ring; coat the O-ring lightly with clean, thin oil.
7. If the fuel pressure regulator was removed, replace the O-ring with a new one and coat it lightly with clean, thin oil. Insert the regulator straight into the rail, then check that it can be rotated freely. If it does not rotate smoothly, remove it and inspect the O-ring for deformation or jamming. When properly installed, align the mounting holes and tighten the retaining bolts to 84 inch lbs. (9 Nm). This procedure must be followed even if the fuel rail was not removed.
8. Install or connect the following:
   • Injector into the fuel rail, constantly turning the injector left and right during installation. When fully installed, the injector should still turn freely in the rail. If it does not, remove the injector and inspect the O-ring for deformation or damage.
   • Delivery pipe and injectors to the engine. Make certain that each injector fits correctly into its port and that the rubber insulators for the fuel rail mounts are in position.
   • Fuel rail retaining bolts and tighten them to 108 inch lbs. (12 Nm)
   • Wiring harnesses to the appropriate injector
   • Fuel return hose to the pressure regulator, then connect the vacuum hose
   • O-ring on the high pressure fuel line, coat the O-ring lightly with clean, thin oil and install the line to the fuel rail. Tighten the mounting bolts to 48 inch lbs. (6 Nm).
   • PCV hose and spark plug wires
   • Negative battery cable
9. Pressurize the fuel system and inspect all connections for leaks.

3.0L and 3.5L Engines

1. Relieve the fuel system pressure.
2. Disconnect the negative battery cable.

   CAUTION
   Work MUST NOT be started until at least 90 seconds after the ignition switch is turned to the LOCK position and the negative battery cable is disconnected from the battery. This will allow time for the air bag system backup power supply to deplete its stored energy preventing accidental air bag deployment which could result in unnecessary air bag system repairs and/or personal injury.

3. Drain the cooling system.
4. Disconnect all components from the air intake plenum and remove the plenum from the intake manifold.
5. Wrap the connection with a shop towel and disconnect the high pressure fuel line at the fuel rail.

   CAUTION
   Observe all applicable safety precautions when working around fuel. Whenever servicing the fuel system, always work in a well ventilated area. Do not allow fuel spray or vapors to come in contact with a spark or open flame. Keep a dry chemical fire extinguisher near the work area. Always keep fuel in a container specifically designed for fuel storage; also, always properly seal fuel containers to avoid the possibility of fire or explosion.

6. Remove or disconnect the following:
   • Fuel return hose and remove the O-ring
   • Vacuum hose from the fuel pressure regulator
   • Electrical connectors from each injector
   • Fuel pipe connecting the fuel rails
   • Injector rail retaining bolts. Make sure the rubber mounting bushings do not get lost.
7. Lift the rail assemblies up and away from the engine.
8. Remove the injectors from the rail by pulling gently. Discard the lower insulator.

   To install:

   NOTE: Some of the vehicles may have a clip that secures the injector to the fuel rail. Be sure to remove or install the injector clip where necessary.

9. Install or connect the following:
   • New grommet and O-ring to the injector. Coat the O-ring with light oil.
   • Injector to the fuel rail
10. Replace the seats in the intake manifold. Install the fuel rails and injectors to the manifold. Make sure the rubber bushings are in place before tightening the mounting bolts.
11. Tighten the retaining bolts to 84–108 inch lbs. (10–13 Nm). Install the fuel pipe with new gasket.
12. Install or connect the following:
    • Electrical connectors to the injectors
    • Fuel return hose
    • O-ring, lightly lubricate it and connect the high pressure fuel line
    • Intake plenum and all related items, using new gaskets
13. Fill the cooling system.
14. Connect the negative battery cable and check the entire system for proper operation and leaks.