BYD Su Rui’s fault light is on during driving, and the acceleration is weak

14-year BYD Su Rui 473QE, 1.5 self-priming

Fault phenomenon:
The mileage of the car is about 100,000 kilometers. The customer’s fault light suddenly lights up while driving, the acceleration is weak, the instrument fault light is on, and the fault code is p2177. The mixture ratio of the system leaving the idle speed is lean.

Fault phenomenonFault phenomenon
Fault analysis:
Analysis of the causes of less oil and more gas 1. Low gasoline pump pressure or blocked fuel injector, 2. Intake pressure and oxygen sensor failure, 3. Intake manifold and EGR leakage, 4. Carbon deposits in the intake duct.

After checking one by one, the gasoline pressure, idle speed and test run are normal. The engine is immediately shut down and tested with the throttle covered, and there is no leakage. According to the data flow information, the oxygen sensor data will also change when the cleaning agent is sprayed into the intake duct. Finally, it is suspected that the carbon deposits in the intake duct absorb oil and gas. The intake manifold is disassembled and it is found that there are a lot of carbon deposits in the intake duct and valves.

Fault analysis
Solution:
Clean the carbon deposits in the intake manifold and intake duct. The customer tested the car for a week and the light never came on again. The car also accelerates strongly. The problem is solved. I hope I can help you in the future. Thank you.