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• OVERALL DIFFICULTY INDEX: 3/10
• IF YOU HAVE NO TOOLS, YOU SPEND $25 TO GET THEM FOR THIS JOB
• IF YOU HAVE NO EXPERIENCE YOU SPEND 1 HOUR TO CARRY OUT THIS JOB
• RISK OF RESPIRATORY SYMPTOMS, SEE BELOW​

BEFORE YOU START

• Be careful not to inhale the carburetor spray product used in this tutorial, or to let droplets reach your eyes.​

DISCLAIMER:
Our pictorials are of informative nature and do illustrate works carried out by ourselves at our own premises for our own use and satisfaction.
Readers who envisage to carry out similar works inspired by the below method shall do this at their own risks and liability.

NOTE: this tutorial is valid for the following Mitsubishi, Peugeot and Citroën models, all equipped with the same Mitsubishi MIVEC 4B11 engine:

• Mitsubishi Lancer
• Mitsubishi ASX (depending on model-year)
• Mitsubishi Outlander
• Mitsubishi Outlander Sport (depending on model-year)
• Peugeot 4007, 4008
• Citroën C-Crosser and C4 Aircross

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When and why to clean the throttle body - Symptoms of a non-maintained throttle body

You should clean your throttle body every 60,000 Km in order to maintain a smooth idle.
The one in the above picture was never cleaned for 155,000 Km; Apart from the visible carbon build-up which partially obstructs the positive opening of the throttle at idle, this non-maintained throttle body provides the following valuable information on the engine condition:

• There's excessive carbon build-up with loose particles, denoting that the air filter element was also never replaced, also that the car is mostly driven at low speed and low rpm in urban areas.
• Some water drops can be seen condensating on the throttle which signals a head-gasket leak and coolant ingress inside the oil vapor system.

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How to clean the throttle body on Mitsubishi Lancer 2.0 EX

Remove the air intake hose that connects the air filter box to the throttle, disconnect the throttle cable and unscrew its four fixing bolts.

Take off the throttle body of the 4B11 engine, put it in a deep tray and wash it with Carb Spray cleaner, then wipe it out with a clean soft cloth.

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Refitting the throttle body on the Mitsubishi Lancer EX 2.0

Dry well the throttle body with the cloth, clean again in the difficult to reach places if needed, then proceed as follows:

• Apply a drop of motor oil to each side of the throttle shaft, dot not use excess oil, only one drop
• Clean its electric connector with an Electronic or Contact Spray cleaner

Refit the throttle and that's it!

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