What to Do About High Exhaust Temperature in China VI Vehicles?

[JoelMarie]

Here are solutions for high exhaust temperature in China VI vehicles: 1. First, try driving the vehicle at high speeds: This raises the exhaust system temperature to burn off particles in the particulate filter, improving exhaust flow and effectively alleviating the high-temperature issue. 2. Check if the high exhaust temperature is caused by an overly rich air-fuel mixture. Reasons for high exhaust temperature in China VI vehicles: 1. Overly rich air-fuel mixture in the cylinders: In this case, inspect the oxygen sensor and fuel injection system for faults. If the oxygen sensor fails, the vehicle cannot automatically control the fuel injection amount. 2. Abnormal cylinder pressure and ignition timing: Use a diagnostic tool to read the knock sensor's data stream, then adjust the fuel injection amount and ignition timing based on the data. 3. A slight rise in exhaust temperature at high RPM is normal: Exhaust temperature is typically 30-50°C at idle and around 60-70°C at high RPM.

[OEmilia]

I've personally experienced extremely high exhaust temperatures in my China VI diesel vehicle. This is usually normal when the emission system actively raises the temperature to burn off accumulated carbon during DPF filter cleaning. However, excessively high temperatures may indicate problems. Check if it's caused by driving habits - frequent short trips may prevent DPF regeneration, so occasional highway driving or maintaining steady speeds helps complete the burn-off. If temperatures remain abnormally high or warning lights appear, it could indicate sensor failure, exhaust pipe blockage, or cooling system issues. Don't wait until it damages the catalytic converter, as repairs would be extremely costly. First, use an OBD diagnostic tool to read fault codes for basic troubleshooting. Regular maintenance with specialized engine oil can prevent buildup. Safety first - if anything feels wrong, immediately visit a professional repair shop for inspection rather than attempting DIY fixes.