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How to Replace Fuel Injector for Benz C350

Posted on February 24, 2019 by VCDS

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If your car is starting to run rough, getting horrible gas mileage or have an error code, there is a good chance it is time to replace the fuel injectors. So here I want to share you about how to replace fuel injector for Benz C350.

 

Applicable Models:

C350 (2007-14), SLK350 (2004-14), CLS350 (2004-14), CLK350 (2005-14), E350 (2005-14), S350 (2005-14), SL350 (2005-14), R350 (2006-14), ML350 (2006-14), Viano (2005-14), Sprinter (2006-14), CLC350 (2008-14), GLK350 (2008-12)

 

Preparations:

Parts Required: Injectors, white lithium grease, O-rings

Hot Tip: Check for flooded cylinders

Performance Gain: Better-running engine, improved fuel mileage

Complementary Modification: Replace worn out hoses

 

Procedures:

First,you need to remove the front and rear engine covers along with the air ducts.Please read the article I wrote before: How to Remove Benz C Class W204 Engine Cover

 

The fuel rail and injectors are located on both the left and right side of the intake manifold and partially hidden by the wiring loom and EGR hoses (red arrows).The fuel rail is a single piece and connected by a piece of pipe that runs along the rear of the ECU unti.

How to Replace Fuel Injector for Benz C350

To remove the rail and injector begin by disconnecting the two wiring connections on the left side of the motor (red arrows) and slipping the harness of the fuel rail (yellow arrow).

How to Replace Fuel Injector for Benz C350

Pull back on the wiring bracket on the right side only for the connection the ECU (red arrow).This separate the wiring connection.

How to Replace Fuel Injector for Benz C350

Tilt the EU back out of the way with the left side wiring connection still attached (red arrow).Use a T30 Torx and remove the ECU mount on the right side of the intake manifold (yellow arrows).

How to Replace Fuel Injector for Benz C350

Use an E10 Torx and remove the fasteners holding the wiring loom in place (red arrows) on the right side valve cover.Use a T30 Torx and remove the single Torx screw connecting the wiring loom harness to the intake manifold (yellow arrow).

How to Replace Fuel Injector for Benz C350

Disconnect the wiring from the coils by using a small screwdriver and pushing the clip back and then gently squeezing the clip and sliding the connections off (red arrow).

How to Replace Fuel Injector for Benz C350

 

Use an E10 Torx and remove the bolt holding the ground wire in place (red arrow).

How to Replace Fuel Injector for Benz C350

Continue to use the T30 Torx and remove the two screws holding the wiring harness bracket from the rear of the motor (red arrows).

How to Replace Fuel Injector for Benz C350

Disconnect the wiring from the air pump (red arrow)

How to Replace Fuel Injector for Benz C350

 

Remove all the electrical connections from the front of the right side cylinder head (red arrows) and move the wiring harness off to the side.

How to Replace Fuel Injector for Benz C350

Use an E10 Torx and remove the wiring harness connectors from the left side bank (red arrows),including the one on the lift eye on the rear.

How to Replace Fuel Injector for Benz C350

Next,remove the two T30 Tox screws (red arrows) holding the left side ECU bracket and release the EGR hose from underneath it (yellow arrow).

How to Replace Fuel Injector for Benz C350

Pull the EGR hose from the top of the throttle body (red arrow) and move hose out of the way.

How to Replace Fuel Injector for Benz C350

The connections for the ingjectors are small,can be brittle and in a tight spot.Use a small flathead screwdriver and pop up the gray clips (red arrow).Then gently squeeze the clips and pull the connections off each injector.

How to Replace Fuel Injector for Benz C350

Even though the engine should have been siting overnight and you have removed the fuel pump relay to try and get the fuel out of the rail there will still be come.Unscrew the Schrader valve can and wrap a screwdriver in a rag and press in the end of the Schrader valve (red arrow).This will release the remaining pressure in the system.Gasoline will come out,so be prepared to catch and dispose of it according to the regulations in your area.

How to Replace Fuel Injector for Benz C350

Use a 17mm wrench and separate the fuel line from the distribution rail (red arrow).Some fuel will come out,so be prepared to catch and dispose and dis pose of it according to the regulations in your area.

How to Replace Fuel Injector for Benz C350

Remove the four E10 Torx bolts holding the fuel rail to the intake manifold (red arrows)

How to Replace Fuel Injector for Benz C350

You can now pull the fuel distribution rail out from the manifold.The rail is just held in place by the six O-rings between the injectors and manifold,so you should just be able to wiggle and pull it straight up.

How to Replace Fuel Injector for Benz C350

Once the injectors are removed there is an hole into the intake manifold and then the combustion chamber.Make sure you stick some rags or clean cloth into the opening to

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