Reasons for intermittent idling vibration in Dongfeng Fengshen AX7
2 Answers
Reasons for intermittent idling vibration in Dongfeng Fengshen AX7 are as follows:1. Throttle carbon deposits: The first thing that comes to mind is throttle carbon deposits, but it's also the least likely culprit. The intake valve directly affects the vehicle's air intake, thereby influencing fuel injection quantity, making it a crucial component.2. Fuel injector carbon deposits: This is the most likely component where carbon deposits could cause insufficient fuel injection. It should be promptly inspected or replaced as needed.3. Ignition coils and spark plugs: If these two components malfunction, they are most likely to cause cylinder misfires, resulting in engine power imbalance and inevitable vibration, accompanied by decreased power.
When my Dongfeng Fengshen AX7 exhibited intermittent idle vibration, my first instinct was to inspect the ignition system, as aged spark plugs or faulty ignition coils can cause unstable combustion, akin to engine misfires. Secondly, throttle body carbon buildup is another common issue, especially after urban short-distance driving, where accumulated grime restricts airflow, leading to fluctuating engine RPM. Additionally, loose engine mounts or insufficient belt tension can induce tremors, feeling like minor earthquakes when the car is in neutral. Fuel system problems like clogged injectors may also disrupt combustion due to poor fuel delivery. For diagnosis, I recommend using an OBD scanner to read trouble codes or visiting a professional shop for throttle body and spark plug cleaning. Don’t underestimate such vibrations—prolonged neglect may accelerate engine wear or increase fuel consumption, so timely action ensures safety and peace of mind.
