Can a High Idle Speed Be Fixed by Replacing the Throttle Body?

[DelJasmine]

Replacing the throttle body is not a solution for high idle speed, as the issue may not necessarily stem from the throttle body. Blindly replacing parts can increase repair costs. 1. Faulty Idle Speed Control Valve: The normal idle speed of an engine is determined by the idle speed control valve. The electronic control unit adjusts the throttle opening based on signals such as temperature and engine speed. If oil residue or other contaminants prevent the throttle from closing properly, the electronic control unit cannot accurately regulate the engine's idle speed. 2. Clogged Fuel Injectors: When fuel injectors become clogged, they fail to spray fuel as instructed, leading to uneven air-fuel mixture, poor cylinder performance, and unstable idle speed. 3. Air Intake System Leak: Under normal conditions, the air intake volume is strictly controlled. If there is a leak in the air intake system, the air flow sensor cannot measure the intake volume accurately, resulting in unstable idle speed.