What Happens When a Vehicle's Exhaust Pipe is Blocked?
1 Answers
If the exhaust cannot escape, fresh air cannot enter either, the spark plug fails to ignite, and the vehicle cannot start. Here are the troubleshooting methods for exhaust pipe faults: 1. First, start the diesel engine to a speed of about 700r/min, then perform a fuel cut-off check cylinder by cylinder. When disconnecting the high-pressure fuel pipe of the second cylinder, observe that the exhaust smoke changes from the original gray-white smoke to a large amount of white smoke, indicating an internal fault in the second cylinder. 2. Remove the injector of the second cylinder and check its injection pressure and atomization quality. It is found that the injector nozzle assembly is leaking fuel. After replacing the assembly, reassemble and restart the diesel engine. Observe the exhaust smoke and find that it changes from the original gray smoke to a large amount of white smoke, indicating that water has entered the combustion chamber. The cylinder head, cylinder gasket, and cylinder liner should be disassembled for inspection. 3. After stopping the engine, when disassembling the cylinder head, it is found that four nuts on the first and second cylinders' cylinder head become loose when tightened with a torque of 100N·m. This situation is caused by the cylinder gasket not being properly compressed, leading to water entering the combustion chamber. 4. After re-tightening with a torque of 280N·m as required, start the diesel engine for 5 minutes, and the white smoke from the exhaust pipe disappears, indicating the fault has been resolved.
