What Causes Excessive Oil in the Throttle Body?

[ElliotLee]

Excessive oil in the throttle body may be caused by a malfunction in the engine's crankcase ventilation system, such as a damaged one-way valve in the exhaust gas recirculation (EGR) system. A small amount of oil in the throttle body is normal, but excessive oil indicates an issue. It could be due to a fault in an engine accessory and should be inspected and addressed promptly. Below are some key points about the throttle body: 1. Overview: The throttle body is a controllable valve that regulates air intake into the engine. After entering the intake manifold, the air mixes with fuel to form a combustible mixture, which ignites to generate power. Connected to the air filter at the top and the engine block at the bottom, it is often referred to as the 'throat' of the car engine. 2. Functionality: The throttle body is one of the most critical components in modern fuel-injected engine systems. There are two types: traditional cable-operated and electronic throttle bodies. Traditional throttle bodies use a cable or linkage connected to the accelerator pedal and the throttle linkage plate, while electronic throttle bodies rely on throttle position sensors to adjust the opening angle based on the engine's power demand, thereby regulating the air intake volume.