Cleaning the throttle body causes the fuel injector's spray diameter to increase, resulting in more fuel being injected per unit time, which leads to higher fuel consumption. One solution is to replace the nozzle. It is also advisable to clean the carbon deposits in the intake manifold and valve. After cleaning the fuel system, it is essential to perform a computer matching and learning process. Otherwise, the computer will still read the pre-cleaning data, leading to increased fuel consumption. Here are some indicators that determine whether the throttle body needs cleaning: 1. Unstable Idle: The vehicle's idle speed is controlled by the throttle body. If the throttle body is dirty, it directly causes unstable idle. 2. Increased Fuel Consumption: When accelerating, the throttle position sensor sends signals to the computer, which interprets the throttle opening angle. A larger opening angle results in more fuel injection. If the throttle body is dirty, carbon deposits can lift the throttle plate, causing the computer to receive signals indicating a slight acceleration state, which leads to higher fuel consumption (under normal conditions, the opening angle should be within 0-5° when the air conditioning is off). 3. Engine Stalling When Releasing the Throttle: This is a sign of severe carbon buildup in the throttle body. When driving normally, releasing the throttle may cause the vehicle to stall suddenly, or a manual transmission car may stall during gear shifts. In such cases, the throttle body must be removed for deep cleaning. 4. No Idle: The symptom of no idle is that the vehicle only runs when the throttle is pressed and stalls when released.
