How to Deal with Overly Rich Fuel Mixture Fault?
2 Answers
Solutions for overly rich fuel mixture fault are as follows: 1. Consult a professional technician: Have a professional technician use a decoder to check whether the data streams of various sensors during normal engine operation are within the normal range, focusing on the oxygen sensor, coolant temperature sensor, throttle position sensor, and intake pressure or air flow meter data. Determine the fault direction based on the displayed data. 2. Check for carbon deposits: Inspect the throttle body, intake pipe, valves, and fuel injectors for carbon buildup and clean them if necessary. 3. Inspect the ignition system: Check if the ignition system is functioning properly and whether there is any leakage caused by aging ignition coils or cylinder lines. 4. Check fuel pressure: Verify if the fuel pressure is normal and whether there is any leakage in the fuel injectors. Installation locations are divided into two types: external pumps and internal pumps. External pumps are installed in the fuel delivery line outside the fuel tank, while internal pumps are mounted inside the fuel tank.
What is a rich fuel mixture fault? It means there's too little air or too much fuel being injected, causing the car to shake violently and consume excessive fuel. As someone who frequently works on cars, I follow a step-by-step troubleshooting process when encountering this issue: First, check if the air filter is clogged—clean or replace it if necessary. Then, plug in an OBD scanner to read the fault codes and see if the oxygen sensor is malfunctioning. If that's normal, inspect the fuel injectors for clogs or leaks, as faulty injectors can spray fuel erratically. Next, test the coolant temperature sensor; if it's defective, the engine control unit may incorrectly increase fuel injection. The solution is to replace any faulty sensors or clean the affected components. Leaving this issue unresolved can harm the engine, so it's best to fix it promptly to save on fuel costs and protect the environment. Regular maintenance can help prevent such problems.
