What Causes a Car to Stall When Releasing the Throttle Without Idling?
2 Answers
Releasing the car's throttle causes it to stall, and there are many reasons for this malfunction. Common causes include: fuel pressure being too low, air filter clogging, injector atomization or fuel leakage, improper idle adjustment, poor spark plug performance, and air flow meter failure. Below is an introduction to related knowledge: 1. Causes of stalling: The engine's internal injector may be dripping or clogged, or there may be a circuit fault or insufficient fuel injection, preventing it from injecting fuel as instructed by the electronic control unit. This results in the engine's internal mixture being too lean or too rich, causing poor performance in individual cylinders and leading to engine stalling. 2. Engine-related reasons: The issue of carbon buildup in the throttle should also be considered. The throttle's function is to control the entry and exit of engine gases. Once air enters the engine, it mixes with gasoline to form a combustible mixture, providing power for the engine. The throttle plays a crucial role, acting like a valve to control air intake into the engine.
I've seen many cars with this issue—stalling when releasing the throttle is really annoying, mainly due to a faulty idle control system. For example, excessive carbon buildup in the idle control valve can cause it to stick, leading to unstable engine speed at low RPMs and direct stalling. Or, a dirty throttle body can restrict airflow. Sometimes, insufficient fuel pump pressure or clogged fuel injectors result in inadequate fuel supply. A vacuum leak can also disrupt idle air balance. If the ECU signals are incorrect, such as aging oxygen sensors failing to report data, idle control can go haywire. It's recommended to visit a professional shop immediately to scan for trouble codes with a diagnostic tool, preventing sudden stalling while parked and potential accidents. Daily driving habits like avoiding aggressive throttle inputs can help reduce carbon buildup.
