What are the symptoms of a faulty fuel injector in an old Jetta?
2 Answers
Manifestations of a faulty car fuel injector: 1. Engine vibration: When the car's fuel injector is damaged and fuel injection is obstructed, the engine may exhibit symptoms such as operational vibration during operation. 2. Decreased power and increased fuel consumption: As the fuel injector deteriorates, the fuel injection volume and pressure cannot be guaranteed, leading to symptoms of reduced vehicle power and increased fuel consumption. 3. Increased tailpipe emissions pollution: Malfunctions in the engine's fuel injector will inevitably affect the mixing and combustion of the combustible gas mixture, thereby increasing the pollutants in the vehicle's tailpipe emissions. 4. Difficulty starting or even stalling: If the fuel injector is severely damaged, the vehicle may experience difficulty starting, or even sudden stalling while driving. 5. Engine misfire: If the fuel injector in an individual cylinder is severely damaged, the engine is highly likely to misfire, resulting in severe engine vibration.
I've been driving an old Jetta for many years and have experienced a faulty fuel injector, with quite noticeable symptoms. Starting the car felt unusually difficult, requiring prolonged key turning to barely ignite, especially during cold winter starts. After starting, the idle was unstable, and the engine shook like a sieve. Acceleration was sluggish, with little response even when the throttle was fully depressed, and speed wouldn't increase. Fuel consumption noticeably rose—normally a full tank could last 500-600 kilometers, but during this time, I had to refuel before reaching 400. The exhaust emitted black smoke with a pungent odor. The most dangerous part was sudden stalling; once, my car stalled at a traffic light, nearly causing a rear-end collision. I recommend getting it checked promptly if issues arise. Faulty fuel injectors are often caused by carbon buildup or aging; cleaning or replacement can fix the problem. Using quality gasoline with fuel additives for prevention can extend their lifespan.
