What Causes a Car's Exhaust Pipe to Turn Red?

[GriffinDella]

Reasons for a car's exhaust pipe turning red: 1. Lean air-fuel mixture; 2. Delayed ignition timing; 3. Exhaust valve not sealing properly; 4. Malfunction in the electronic control system coordination. Solutions: 1. Adjust the air-fuel mixture concentration; 2. Inspect and adjust the valve clearance; 3. Adjust the ignition or fuel injection timing. Under normal operation, the temperature of an engine's exhaust pipe should not be excessively high. Only when the engine operates under heavy load for an extended period will the exhaust pipe turn red. If the fuel injection timing is excessively delayed, it not only slows down the combustion speed but also leads to incomplete combustion, causing diesel to burn in the exhaust pipe during the later stages of injection, thereby increasing the exhaust temperature.