What Causes Severe Vibration When the Air Conditioning is Turned On in a Buick Excelle?
1 Answers
Buick Excelle experiences severe vibration when the air conditioning is turned on due to a dirty throttle body and insufficient engine power. Insufficient engine power: When the engine power is low, high idle speed indicates that the compressor is working. When the compressor is not operating, the idle speed drops, and the steering wheel does not vibrate. When the air conditioning is turned on during normal driving, the increased load from the compressor causes the engine speed to decrease, resulting in noticeable vehicle vibration. To address this issue, manufacturers typically install an engine idle speed boost system for air conditioning. This system increases the engine speed to the required range when the air conditioning compressor is active. Dirty throttle body: A dirty throttle body affects engine performance. Turning on the air conditioning under these conditions further increases the engine idle load, leading to steering wheel vibration. Cleaning the throttle body can prevent this issue. The vibration caused by air conditioning use, based on current vehicle conditions, is likely due to a dirty throttle body. It is recommended to have it cleaned at a repair shop. According to current vehicle control technology and maintenance cases, this is a common issue. Throttle carbon buildup is primarily caused by the engine control unit's characteristics, as well as factors such as low temperatures, low-speed driving, short-distance trips, and frequent starts. The noise from the air conditioning system is normal compressor operation, and no other issues are likely present. The engine drives the air conditioning compressor to provide cooling, which is a heavy load for the engine. When the air conditioning is turned on, the engine must also power the compressor, leading to noticeable power loss and increased vibration. This effect is more pronounced at idle speed. Increasing the idle speed slightly may improve the situation, though it will result in higher fuel consumption.
