Although malfunctions of the exhaust system do not affect the vehicle's ability to operate, the roar of the engine due to a burnt out muffler greatly reduces the comfort of using the machine and negatively affects those around it.
The exhaust system of the car VAZ-2109 consists of three parts - a receiving pipe, a resonator and a muffler. On cars with an injection engine, a lambda probe is additionally installed on the front pipe - this is an oxygen sensor that monitors the composition of the exhaust gases, and a three-component converter is installed in the resonator, which performs the function of afterburning unburned fuel.
If the car is equipped with an oxygen sensor and a neutralizer, then it is strictly forbidden to fill in leaded gasoline, even for a short time, because this leads to premature failure of these components and to engine stalling or severe loss of power.
Exhaust system malfunctions
Malfunctions of the exhaust system of a VAZ-2109 car are easily identified by ear - by the greatly increased volume of the exhaust. These malfunctions are divided into two types - repairable and requiring replacement of the exhaust system.
The first is the breakthrough of exhaust gases through a burnt-out exhaust manifold gasket or through poorly tightened clamps that hold parts of the system together. These malfunctions are eliminated by replacing the gasket or constriction of the clamps using a special heat-resistant sealant.
Malfunctions of the second type are a consequence of corrosion and lead to the appearance of holes in the muffler or resonator. It makes no sense to brew them or cover them with mastic, since this does not give a long-term effect. The metal continues to deteriorate under the action of corrosion near the sealed holes and new ones are formed. Therefore, it is better to replace rusted muffler and resonator immediately.
Exhaust system replacement
Since the dismantling and installation of the exhaust system is carried out under the bottom of the car, it is advisable to carry out these works on a lift or inspection pit. When working on a flat surface, the car will have to be jacked up, so you need to prepare reliable car stands.
For work, you will need 13 spanners - 2 pcs., Heat-resistant sealant, a set of rubber cushions (5 pcs.), A metallized gasket for the downpipe.
Brake the vehicle with the parking brake and place stops under the rear wheels. Before starting work, coat all threaded connections with WD-40 penetrating grease.
Dismantling the system begins with the muffler. Unscrew the two nuts on the retaining band connecting the muffler and resonator. Remove the muffler from the pillows and take it out from under the car.
Next, unscrew the nuts on the clamp connecting the resonator and the front pipe, remove the resonator from the rubber pads and set it aside. The intake pipe is attached to the exhaust manifold with 4 brass nuts. Unscrew these nuts and carefully remove the front exhaust pipe. Remove the old metalized gasket from the exhaust manifold flange.
Begin installing the exhaust system with the front pipe, do not forget to install a new gasket between the exhaust manifold and the pipe. When installing the resonator and muffler, apply heat-resistant sealant to the sockets, install the O-rings and tighten the clamps. Always replace old rubber cushions with new ones. After installing the system, start the vehicle and check that there is no exhaust gas escaping through the connections.
