Fuel Injectors - All

This procedure covers the removal and replacement of all four fuel injectors on the 1.5L turbo engine, including fuel system depressurization and fuel rail removal.

Warnings

Tools required

Parts

• Fuel injector × 4 — Use OEM Honda fuel injector 16450-5AA-A02 or equivalent
• Fuel injector O-ring set × 1 — Use OEM specification - upper and lower seals
• Fuel line O-rings × 2 — Use OEM specification
• Fuel rail seal/gasket kit × 1 — Use OEM specification if not included with injectors

Preparation

1. Ensure engine is completely cool to the touch
2. Park vehicle on level ground and engage parking brake
3. Place fender covers or towels over both fenders to protect paint
4. Remove engine cover by pulling upward on the four attachment points
5. Disconnect negative battery cable and wait 3 minutes for system discharge
6. Have new injectors, O-rings, and seals ready for installation

Procedure

1. 1

   Depressurize fuel system
   Locate the fuel pump relay in the under-hood fuse box (driver side). Remove the fuel pump relay (typically #36 or labeled PGM-FI). Reconnect the battery temporarily, then attempt to start the engine. It will run briefly and stall as fuel pressure is released. Crank the engine 2-3 more times to ensure complete depressurization. Disconnect the battery again.
   ⚠️Do not skip this step. Residual fuel pressure can exceed 400 PSI in the direct injection system.
2. 2

   Remove intake components
   Disconnect the air intake tube from the turbocharger inlet by loosening the hose clamp. Remove the intake air duct assembly to provide access to the fuel rail area. Disconnect any vacuum lines or breather hoses attached to the intake components. Label connections if needed for reassembly.
   Torque spec

   Hose Clamps3 Nm (2 lb-ft)
3. 3

   Disconnect fuel supply line
   Locate the fuel feed line connection on the fuel rail (driver side of engine). Place shop towels around the connection to catch residual fuel. Using the appropriate fuel line disconnect tool, press the release tabs and carefully separate the quick-connect fitting. Plug the fuel line with a clean rag or cap to prevent contamination.
   ⚠Some fuel will spill even after depressurization. Have towels and drain pan ready.
4. 4

   Disconnect electrical connectors
   Disconnect the electrical connector from each of the four fuel injectors by pressing the release tab and pulling straight up. Disconnect the fuel pressure sensor connector located on the fuel rail. Move wiring harnesses aside to provide clearance for fuel rail removal.
   ℹ️Take a reference photo of connector positions if needed for reassembly.
5. 5

   Remove fuel rail mounting bolts
   Locate the two fuel rail mounting bolts (one near each end of the rail). Using a 10mm socket, remove both bolts completely. Keep bolts in a clean location for reinstallation.
   Torque spec

   Fuel Rail Bolts12 Nm (9 lb-ft)
6. 6

   Remove fuel rail assembly
   Carefully pull the fuel rail upward with even pressure on both ends. The injectors will come out of the cylinder head with the rail. You may need to gently wiggle the assembly while pulling to break the injector O-ring seals. Once free, place the fuel rail and injector assembly on a clean work surface with injectors facing upward.
   ⚠Do not allow injectors to impact hard surfaces. The precision tips can be damaged easily.
7. 7

   Remove injectors from fuel rail
   For each injector, note its position and cylinder assignment. Remove the metal retaining clip securing each injector to the fuel rail. Pull each injector straight out of the fuel rail. Remove and discard all old O-rings from both the upper (fuel rail side) and lower (cylinder head side) positions on each injector.
   ℹ️Injectors are numbered or can be position-specific. Keep them organized or plan to install all new units.
8. 8

   Clean injector ports
   Inspect the injector bores in the cylinder head for any debris or damaged seals. Use a plastic bristle brush to clean the seating surfaces. Remove old O-ring material from the fuel rail injector ports using a pick or seal removal tool. Ensure no debris falls into the cylinder head ports; stuff clean shop towels into ports if needed during cleaning.
   ⚠Do not use metal brushes or sharp tools that could scratch sealing surfaces in the cylinder head.
9. 9

   Prepare new injectors
   Lubricate new O-rings lightly with clean engine oil or provided lubricant. Install new lower O-rings (larger diameter) onto each new injector at the tip end. Install new upper O-rings (smaller diameter) onto the fuel rail end of each injector. Ensure O-rings are seated properly in their grooves without twists or damage.
   ℹ️Do not use petroleum jelly or other lubricants not compatible with gasoline. Use only clean engine oil or provided O-ring lubricant.
10. 10

    Install injectors into fuel rail
    Insert each new injector into its corresponding position in the fuel rail with a gentle twisting motion. Ensure the upper O-ring seats properly. Install the metal retaining clip on each injector, ensuring it fully engages and locks the injector in place. Verify each injector is secure and properly oriented.
11. 11

    Install fuel rail assembly
    Remove any protective plugs or towels from the cylinder head injector bores. Align all four injectors with their corresponding bores in the cylinder head. Apply even downward pressure on both ends of the fuel rail, using a gentle rocking motion if needed to seat all injectors. Press down firmly until the fuel rail mounting holes align with the threaded holes in the cylinder head.
    ⚠Ensure all injectors start into their bores simultaneously. Forcing the rail with misaligned injectors will damage O-rings.
12. 12

    Install fuel rail bolts
    Thread both fuel rail mounting bolts by hand to ensure proper thread engagement. Using a torque wrench, tighten both bolts to specification in a cross pattern (alternating between the two bolts).
    Torque spec

    Fuel Rail Bolts12 Nm (9 lb-ft)
13. 13

    Reconnect electrical connections
    Reconnect the electrical connector to each fuel injector, ensuring each clicks into place securely. Reconnect the fuel pressure sensor connector. Verify all connectors are fully seated and locking tabs are engaged.
14. 14

    Reconnect fuel supply line
    Install new O-rings on the fuel line quick-connect fitting if provided. Push the fuel supply line firmly onto the fuel rail connection until it clicks into place. Gently tug on the line to verify it is locked. If the connection uses threaded fittings, torque to specification.
    Torque spec

    Fuel Line Fittings25 Nm (18 lb-ft)
15. 15

    Reinstall intake components
    Reinstall the air intake duct assembly and reconnect all vacuum lines and breather hoses to their original positions. Connect the intake tube to the turbocharger inlet and secure with the hose clamp.
    Torque spec

    Hose Clamps3 Nm (2 lb-ft)

Reassembly

1. Reinstall the fuel pump relay in the under-hood fuse box
2. Reconnect the negative battery cable and ensure connection is tight
3. Reinstall the engine cover by pressing down on all four mounting points until they click into place
4. Remove fender covers and clean any spilled fuel from surrounding areas

Verification

• Turn ignition to ON position (do not start) and listen for fuel pump to prime for 2-3 seconds. Repeat this 3-4 times to build fuel pressure
• Inspect all fuel connections for any signs of leakage while pressure is building
• Start the engine and allow it to idle. Check for fuel leaks around injectors, fuel rail, and supply line connection
• Monitor for rough idle or misfires. Engine may run slightly rough for the first 30 seconds as air purges from fuel system
• Rev engine gently to 2000-3000 RPM and verify smooth operation
• Clear any diagnostic trouble codes if check engine light is illuminated from depressurization procedure
• Test drive vehicle to confirm normal operation and no fuel odors in cabin
• Re-check all connections for leaks after test drive with engine at operating temperature

More procedures for this vehicle