Can Uneven Fuel Injection in Audi Cause Malfunctions?
2 Answers
Audi uneven fuel injection can cause malfunctions. Black smoke from exhaust pipe when engine is warm: Due to wear, the fuel injection quantity in each cylinder becomes unbalanced. The control function simultaneously regulates both cylinder banks, but cannot compensate for uneven fuel injection. This results in some cylinders running rich and others lean, causing unstable idle and excessive emissions. The solution is to replace all 6 fuel injectors. Difficulty starting the vehicle: The fuel injection duration during startup consists of the basic injection time plus the extended time adjusted by the coolant temperature sensor. For newer ECU versions, the basic injection time can be set using V.A.G1551 diagnostic tool.
Uneven fuel injection will definitely cause problems in Audi vehicles, and I've encountered many similar cases. The fuel injectors are responsible for evenly spraying fuel into each cylinder. If an injector gets clogged or worn out, the engine starts shaking like a sieve, with noticeably weak acceleration and delayed throttle response. This not only affects driving experience but may also cause cylinder misfires, leading to spark plug carbon buildup or catalytic converter damage. In Audi's turbocharged engines, this issue is even more sensitive – fuel consumption increases significantly, emissions worsen, and exhaust gases develop abnormal odors. If neglected long-term, repair costs skyrocket; replacing injectors can cost thousands. I recommend regular use of fuel system cleaners and addressing issues early at specialized shops to save big money.
