Operation & Maintenance Manual for WP7 Euro Ⅵ Vehicle Diesel Engine 3.4 High fuel consumption 3.5 Dark smoke in the exhaust 13 Causes Troubleshooting 1. Air inlet pipe is blocked (air filter is blocked) Check the air filter and air inlet pipe to ensure smooth air-inlet 2 Exhaust back pressure is high Check the exhaust pipe and braking valve to ensure smooth exhausting 3. Poor fuel quality Replace the fuel as specified 4. Fuel pipe is blocked Check and remove the blockage 5. Fuel pipe leaks Check the leaking location and replace the pipe to ensure good sealing performance Causes Troubleshooting 1.
Air inlet is blocked or exhaust back pressure is high Check the inlet and exhaust pipe to ensure the pipes are not blocked 2. Poor fuel quality Wash and replace 3. Wrong valve timing or injection timing Adjust as required 4. Injection pump injects too much fuel Check and adjust (by specialized operator) 5. The pressure of turbocharging system is insufficient Check if there is any leakage with the pipes and joints 6. Malfunction of turbocharger Check and replace the turbocharger assembly 7. Intercooler is damaged or there is leakage Replace or repair 8. Wrong working point of smoke limiter Re-adjust (by specialized operator)