What are the symptoms of a stuck throttle valve?

[VonBeau]

Here is a detailed introduction to the symptoms of a stuck throttle valve: Engine idle: The engine idle is unstable, high idle persists without dropping, the engine has difficulty starting, cold starts are difficult, or the engine idle is unstable or nonexistent. Engine power: The engine has difficulty starting. The engine lacks power, has poor acceleration performance, and operates unstably. Here is an introduction to troubleshooting methods: Throttle valve inspection: Use a diagnostic tool to perform a throttle valve inspection and observe the data stream. If the throttle valve opening is large, it must be cleaned. Generally, replacement is not necessary if there are no permanent fault codes. Throttle valve replacement: Replace the throttle valve if diagnostics confirm that the throttle valve fault is permanent. Throttle valves are generally not repairable and should be replaced as an assembly.

[DelEleanor]

I've been driving for many years and have firsthand experience with throttle valve sticking issues. At idle, you can feel the engine shaking and running very unevenly, with the tachometer needle jumping up and down like it's hiccuping. When accelerating, pressing the gas pedal yields no response—there's a delay of several seconds before the car moves, and sometimes it suddenly lurches forward, which can be startling, especially when starting from traffic lights. The problem is worse when starting a cold engine, with significant shaking or even stalling, because the cold makes the valve more prone to freezing and sticking. Fuel consumption also inexplicably increases, feeling like a full tank of gas is gone in less than a week, which is quite costly. The engine light often stays on to alert to errors, and if not repaired promptly, it can worsen to carbon buildup in the intake pipe, affecting overall performance. It's recommended to check and clean early to avoid major repairs.

[AylaFitz]

As a young car owner who frequently modifies vehicles, I've experienced various symptoms of throttle body sticking. The engine RPM becomes unstable and fluctuates erratically at idle. Acceleration response is severely delayed - pressing the gas pedal feels like urging a lazy person who won't move. Cold starts frequently trigger malfunctions, with severe shaking and frequent stalling. The dashboard check engine light illuminates when the ECU detects issues like P0120 code. Driving feels rough with noticeable jerks that ruin the driving experience. Fuel consumption increases significantly due to improper air control causing poor combustion. It may also lead to dirt accumulation in the intake manifold, spreading malfunctions and creating long-term risks - regular cleaning can prevent this.

[McAmir]

Throttle sticking symptoms are obvious: rough idle with unstable engine speed fluctuations. Unresponsive acceleration with strong delay when pressing the pedal. Severe cold start shaking, prone to stalling, warning lights on, increased fuel consumption raising costs. Early valve cleaning prevents bigger troubles.