How to Replace Fuel Injectors in a Dodge Ram (2004-2008)

Tools and Materials Needed

• New fuel injectors (available at 1aauto.com)
• Flat blade screwdriver
• 8 to 10 mm sockets with a ratchet and extensions
• Angled pick
• Rag
• Fuel system safe cleaner

Preparation Steps

1. Accessing the Connector:

   • Behind the inner wheel well liner on the driver's fender, locate the large connector.
   • Use a flat blade screwdriver to pry back the red safety.
   • Lift the gray latch, separate the terminals without removing the connector.

2. Fuel System Preparation:

   • Open the fuel door and remove the fuel cap.
   • Start and let the truck die, continue cranking to run the system out of fuel.
   • Use a 10 mm wrench to disconnect the negative battery terminal.

Removing the Airbox

1. Airbox Disassembly:

   • Release metal clips and remove the airbox.
   • Detach the hose using a flat blade screwdriver.
   • Remove the assembly and bottom half of the airbox.

2. Bolt Removal:

   • Use a 10 mm socket to remove two bolts (one behind the alternator, one behind the oil cap).
   • Disconnect intake air temp sensor.

Fuel Rail and Injector Removal

1. Fuel Rail Preparation:

   • Remove the cap on the pressure release valve on the passenger side of the fuel rail.
   • Use a rag to catch excess fuel and press down the valve tab.

2. Dirt and Debris Cleaning:

   • Clean dirt from the manifold using compressed air or cleaner.

3. Injector Removal:

   • Use a flat blade screwdriver to lift the red safety tab.
   • Disconnect and remove the connector from the injector.
   • Evenly lift the fuel rail to remove injectors.

4. Injector Clip Removal:

   • Use a screwdriver to pop out the retaining clip.
   • Remove the injector from the rail.

Installing New Fuel Injectors

1. Preparation:

   • Ensure the new injector matches the old one.
   • Use clean fuel to lubricate gaskets.

2. Injector Installation:

   • Insert the new injector into the fuel rail.
   • Reinstall the metal clip.
   • Press the rail back into the manifold.

3. Final Steps:

   • Reconnect injector connector and lock the red tab.
   • Reinstall bolts and pressure valve cap.

Reassembling Components

1. Airbox Reassembly:

   • Reinstall airbox over the throttle body.
   • Tighten bolts with a 10 mm socket.
   • Connect intake air temp sensor and PCV breather hose.

2. Final Connections:

   • Secure the airbox lid and intake tube clamp.
   • Bring down the connector latch and reinstall the red safety tab.
   • Reattach the negative battery terminal.

System Priming

• Insert the key and turn to the on position for 3 seconds, then off.
• Repeat three times to prime the fuel system.
• Start the engine (initial high idle or richness is normal).

Conclusion

• The engine should return to normal idle after initial start.
• For more parts and guides, visit 1aauto.com.

This guide provides detailed steps to replace fuel injectors on a Dodge Ram (2004-2008) with a 5.7 L Hemi engine.