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Mercedes Classe M - Video tutorial
Model: Mercedes Classe M
W163
- Years 1997-2005 To cold start a petrol engine, a "rich" mixture is required, ie a mixture with excess fuel. Since the catalyst in this operating state has not yet reached its operating temperature, a considerable amount of carbon monoxide and hydrocarbons is formed in the time interval between cold start and the intervention of the lambda regulation. do not burn. By means of the insufflation of oxygen-rich ambient air into the exhaust manifold ("secondary air"), a post-oxidation ("afterburning") of the harmful substances takes place at that point. In the car model presented in the video, the secondary air pump is tested right in the front part of the engine and is fixed by an aluminum collar: then unscrew the fixing pins of the bracket, disconnect the socket and the hose to complete the disassembly.
Posted on 28 August 2023 by ScegliAuto
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