Fuel Injection Fuel Rail Assembly Replacement. Cadillac Concours 1997

For 1990-2009 cars

### Removal Procedure

#### Tools Required

J 34730-1A , Fuel Pressure Guage,J 41081 Injector Remover , J 37088-A , Fuel Line Quick-Connect Separator

Notice:

• | Remove the fuel rail assembly carefully in order to prevent damage to the injector electrical connector terminals and the injector spray tips. Support the fuel rail after the fuel rail is removed in order to avoid damaging the fuel rail components.

• | Cap the fittings and plug the holes when servicing the fuel system in order to prevent dirt and other contaminants from entering open pipes and passages.

1. Relieve the fuel system pressure. Refer to Fuel Pressure Relief Procedure .
2. Remove the intake air duct (1) clamp (2) from the air cleaner assembly (3).
3. Remove the intake air duct (1) clamp (5) from the MAF sensor (4).
4. Remove the MAF sensor (4) electrical connector.
5. Remove the EGR pipe and crankcase ventilation pipe at throttle body spacer.
6. Remove the brake booster vacuum hose at intake manifold.
7. Remove the front bank spark plug wires.
8. Remove the injector harness electrical connectors.
9. Remove the transaxle vent hose (2) from the clip attached to the accelerator control cable (1).
10. Remove the fuel pressure regulator vacuum line.
11. Remove the fuel rail ground wire (1) nut at the rear cylinder head.
12. Remove the quick-connect clips from the fuel pipes (engine side).
13. Disconnect the fuel feed and fuel return quick-connect fittings at fuel rail. Refer to Servicing Quick Connect Fittings .
14. Disconnect fuel pipe bracket at the EGR valve.
15. Remove throttle body mount bolts. Refer to Throttle Body Assembly Replacement .
16. Remove the throttle body spacer bolts.
17. Release locking tabs on fuel rail and pry each injector out of intake manifold using J 41081. Refer to Fuel Injector Replacement .
18. Remove the fuel rail assembly.

### Disassemble Procedure

1. Remove the injector harness.
2. Spread the injector retaining clip(s) (10) to release the injector(s) (12) from the fuel rail assembly.
3. Remove the injector(s) (12) from fuel rail.
4. Remove the upper (11) and lower (13) O-ring(s) from injector(s).
5. Discard the O-rings.
6. Clean the throttle body O-ring surfaces. Refer to Throttle Body Assembly Replacement .

### Assemble Procedure

1. Lubricate the new upper (11) and lower (13) injector O-ring(s) with clean engine oil.
2. Install the new upper (11) and lower (13) injector O-ring(s) on the injector(s) (12).
3. Install the injector(s) (12) to fuel rail with new retainer clip(s) (10).

3.1. | Ensure the injector(s) (12) are aligned by orientating the electrical connector perpendicular to the crankshaft.

4. Install the injector harness.

### Installation Procedure

1. Install the fuel rail with injector(s) to intake manifold.

1.1. | A snap will be heard when the injectors are properly seated.

2. Install the throttle body spacer gasket and throttle body spacer (3) to the intake manifold (4).
3. Tighten the bolts.

Tighten
Tighten the bolts to 12 N·m (106 lb in).

Refer to the

Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

in General information.
4. Install the new throttle body gasket (2), throttle body (1), and bolts.
5. Tighten the bolts.

Tighten
Tighten the bolts to 12 N·m (106 lb in).

Refer to the

Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

in General information.

Notice: Use an emery cloth in order to remove rust or burrs from the fuel pipe. Use a radial motion with the fuel pipe end in order to prevent damage to the O-ring sealing surface.

6. Clean the quick-connect fittings.
7. Apply a few drops of clean engine oil to the male ends of the engine fuel rail inlet and outlet pipes.
8. Install the quick-connect fittings to fuel rail.
9. Push both sides of fitting together to cause the retaining tabs/fingers to snap into place.
10. Pull on both sides of fitting to make sure connection is secure once installed.
11. Repeat Steps 8 through 11 for the other fitting.
12. Install the quick-connect clips to the fuel pipes (engine side).
13. Install the fuel pressure regulator and crankcase ventilation vacuum lines.
14. Install the fuel rail ground wire (1) at rear cylinder head.

Tighten
Tighten the fuel rail ground wire bolt to 6 N·m (53 lb in).

Refer to the

Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

in General information.
15. Tighten the fuel rail assembly bolt to 8 N·m (71 lb in).

Refer to the

Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

in General information.
16. Install the injector harness and injector electrical connectors.
17. Install the front bank spark plug wires.
18. Install the brake booster vacuum hose at intake manifold vacuum fitting.
19. Install the EGR pipe at throttle body spacer.

Tighten
Tighten the EGR pipe bolt to 28 N·m (21 lb ft).

Refer to the

Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

in General information.
20. Install the MAF sensor (4) electrical connector.
21. Install the intake air duct (1) clamp (5) from the MAF sensor (4).
22. Install the intake air duct (1) clamp (2) from the air cleaner assembly (3).
23. Tighten fuel filler cap.
24. Install the negative battery cable. Refer to Battery.
25. Inspect for leaks.

26.1. | Turn the ignition switch ON for 2 seconds.

26.2. | Turn the ignition switch OFF for 10 seconds.

26.3. | Turn the ignition switch ON.

26.4. | Check for fuel leaks.

26. Install the intake manifold top cover.

Tighten
Tighten the nuts to 2 N·m (18 in lb).

Refer to the

Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

in General Information.