After the noise has been reproduced, make sure there is no contact between the exhaust pipe and the body, check the alignment, integrity and condition of all components of the exhaust system, and try to eliminate the noise by manually fixing various components of the pipe or heat-insulating screens.
If the noise is localized in the catalytic converter, it is necessary to remove it and conduct a visual inspection inside the housing, and also shake the converter vigorously in order to detect the destruction of the filler or the presence of a foreign object inside.
If the filler is damaged, its cause should be identified and it should be checked whether the pipeline behind the neutralizer is damaged by filler particles.
Fig. 3.80. Elements of the exhaust system: 1 - exhaust manifold gasket; 2 - exhaust manifold; 3 - turbocharger; 4 - boost pressure control valve; 5 - exhaust pipe; 6 - exhaust pipe of reduction; 7 - catalytic converter; 8 - front muffler; 9 - rear muffler; 10 - spring brackets; 11 - thermal protection screens