What Causes Intermittent Idle Vibration in the Mazda Atenza?
2 Answers
If a car experiences body vibration during idle, it is highly likely due to suboptimal performance of certain automotive components, such as unstable oil pressure, aging engine parts, excessively dirty engine throttle, or excessive carbon buildup in the fuel injectors. Below are detailed explanations: 1. Unstable Oil Pressure: If you have already cleaned the engine carbon deposits, cleaned the throttle, replaced the oil pads and spark plugs, but still notice body vibration during idle, it is recommended to visit a 4S shop to check the fuel supply pressure and the intake pressure sensor. Abnormal fuel pump supply pressure or incorrect values and poor performance of the intake pressure sensor can both cause body vibration. The best solution is to check the oil pressure and replace the components if necessary. 2. Aging Engine Components: Components like engine mounts aging can cause body vibration. Engine mounts are essentially the shock absorption system of the engine, responsible for absorbing minor vibrations during engine operation. If the engine mounts are faulty, these vibrations will be transmitted to the steering wheel and the cabin. 3. Excessive Carbon Buildup in the Engine Throttle or Fuel Injectors Causing Vibration: When there is excessive carbon buildup, the gasoline sprayed by the cold start injector will be largely absorbed by the carbon deposits, resulting in an overly lean mixture during cold starts and making it difficult to start. After starting, the gasoline adsorbed on the carbon deposits will be sucked into the cylinders by the engine's vacuum suction force for combustion, enriching the mixture. This causes the engine's combustible mixture to alternate between lean and rich, leading to idle vibration. The solution is to clean the fuel system and check if the idle control valve has carbon buildup, which should be cleaned thoroughly.
I have encountered this intermittent shaking issue before, especially when driving models like the Mazda6 (Atenza). This could be due to problems with the engine's ignition system, such as worn-out spark plugs or poor contact in the ignition coils, leading to uneven combustion at idle and resulting in vibrations. Another common cause is excessive carbon buildup in the throttle body, which blocks the air passage and affects the engine's stable operation. I've dealt with similar situations before, and cleaning the throttle body or replacing the spark plugs usually resolves it. It could also be due to aging or damaged engine mounts, making vibrations more noticeable. I recommend starting with simple checks, like inspecting the spark plugs or trying a fuel system cleaner. If the problem persists, visit a professional repair shop promptly to avoid minor issues turning into major ones. In short, timely action can reduce the risk of engine damage and improve driving comfort.
