Mercedes-Benz Turbo Intake Pipe Replacement

Symptoms

• Poor acceleration
• Too much exhaust smoke
• Check engine light on

What you will need

Parts

• Mercedes-Benz M278 Upper Intake Turbo Pipe
• Mercedes-Benz M278 Lower Intake Turbo Pipe

Tools

• Screwdriver

     Procedure

1. Park the vehicle on level ground and set the parking brakes.
2. Allow the engine to cool down.
3. Pull the hood release under the dashboard and open the hood.

    

4. Remove top turbo pipe (air filter to turbo) by using a screwdriver to loosen upper clamp retaining screws.

5. Loosen the lower retaining clamp by using a screwdriver. Once lost, you may pull the pipe.

    

6. Remove the lower turbo pipe (turbo to intake manifold) by using a screwdriver to loosen the pipe's upper retaining screws.

    

7. Loosen the lower retaining clamp by using a screwdriver, once loose, pull the pipe forward to remove it.
8. Install the lower turbo pipe by loosening the lower clamp using a screwdriver.

9. Push in the top first, insert the bottom part, and push. 

   
10. Tighten the upper screws. 

     

11. Tighten the lower clamp screw.

     

12. To install the Top pipe, insert the pipe bottom first.
13. Line up the Top pipe's lowest part with the turbo inlet.

14. Position the top turbo pipe bottom first, then the upper part, then push. 

    
15. Fasten the clamp at the bottom using a screwdriver.
16. Fasten the upper part retaining screws.

Frequently Asked Question

How do you know your turbo intake pipe is bad?

• You may experience poor acceleration, bad fuel economy, and too much exhaust smoke. Dirt may enter the turbo and cylinders. 

Can you drive a Mercedes-Benz with a bad turbo intake pipe?

• Driving a car with a bad turbo pipe would not be economical and is not recommended.  Dirt may enter the turbo and cylinders. 

Applications

Mercedes-Benz vehicles are equipped with M278 engines.

M278 engines

• 2011–2017 S 500/S 550
• 2011–2014 CL 500/CL 550
• 2015-2017 S 500 Coupé/S 550 Coupé
• 2011–2018 CLS 500/CLS 550
• 2012–2020 SL 500/SL 550
• 2012–2014 E 500/E 550
• 2012-2014 ML 500/ML 550
• 2013–2014 GL 450
• 2013–2019 GL 500/GLS 500/GL 550/GLS 550
• 2016–present BAIC BJ90 (an SUV from Chinese brand BAIC based on the second generation Mercedes-Benz GL-Class)