1. When the engine is cold (at least three hours after the trip) inspect the exhaust system all the way from the engine to the rear pipe. Ideally, the exhaust system is best inspected on a lift, but if one is not available, then raise the car with a jack and place reliable props under it.
2. When inspecting, look for signs of exhaust leaks, especially in connections, for damage and corrosion of pipes and connections, □ also look at all exhaust system hangers and make sure that they are in good condition and hold the system securely in weight (Figure 29.2, a-c).
3. At the same time, inspect the underbody for cracks, cracks, open seams, and other places through which exhaust gases can enter the passenger compartment. Seal all such places with silicone putty or putty.
4. If crackling and other noises are sometimes heard when the car is moving, this may be caused by the blows of the exhaust system on the bottom of the body. Try moving the exhaust system on the hangers and see if it can touch the bottom or the suspension components. If the system has too large a range of movements, then,. most likely, the suspension system is faulty. Replace them or adjust as needed.
5. Check the working condition of the engine by the contents of the end of the exhaust pipe. The deposits remaining here serve as an indicator of engine adjustments. If there is soot or white deposits in the pipe, then most likely the engine fuel system needs to be carefully checked and adjusted.