What are the reasons for the Buick Envision's lack of power when climbing uphill?

[Barbara]

Here are the reasons for the Buick Envision's lack of power when climbing uphill: 1. Fuel quality issues: If the fuel used is of poor quality, excessive impurities or water content in the fuel can lead to insufficient power. Poor-quality fuel can easily clog components such as the fuel filter, fuel pump screen, and fuel injectors, which have small holes or serve a filtering function, resulting in poor fuel supply and reduced engine performance. 2. Gear too high: When climbing uphill, if the gear is set too high, the engine RPM will naturally struggle to increase. 3. Carbon buildup: Excessive carbon buildup on the throttle body and intake manifold can restrict airflow, preventing the fuel from burning completely, which directly affects power output and can also increase fuel consumption. If the fuel injectors are clogged, the fuel atomization effect will be poor, or the injectors may fail to spray fuel altogether, leading to cylinder misfires, reduced engine output power, and insufficient power. 4. Low or unstable idle speed: If the vehicle's idle speed is too low or unstable, it can easily result in a lack of power when climbing uphill. There are many potential causes for such issues, including wiring problems, sensor failures, engine combustion issues, or air intake leaks, among others. Additionally, external factors can also have an impact. Therefore, it is essential to identify the exact cause of the problem before proceeding with further inspections.