What Causes the Idle Speed of Buick Excelle to Fluctuate?

[VonKylie]

The reasons for fluctuating idle speed are as follows: 1. Dirt from the air and sludge from gasoline can easily cause the throttle to become dirty and the idle air control valve to malfunction. 2. Excessive carbon buildup can lead to valves not sealing properly, poor fuel injector atomization, and insufficient combustion. 3. A clogged exhaust pipe can result in poor exhaust flow. 4. Air leaks can cause insufficient vacuum. 5. Aging wiring or issues with the ECU (this phenomenon is unlikely to occur in the short term). It is recommended that owners avoid installing additional devices on the vehicle. 6. Insufficient cylinder compression due to natural wear (this phenomenon is unlikely to occur in the short term).