What Causes the Engine to Stall When Releasing the Throttle?

[LaCassandra]

The reasons for the engine stalling when releasing the throttle are: 1. Fuel pressure too low, air filter clogged, injector atomization or leakage, improper idle adjustment, poor spark plug performance, air flow meter failure; 2. Internal engine injector dripping or clogging, electrical circuit failure, or insufficient fuel injection; 3. Throttle carbon buildup issues. The throttle is a control device for regulating engine power, part of the vehicle's fuel supply system. By adjusting the pedal pressure, it controls the throttle valve opening, regulates air intake, with the computer managing fuel quantity, thereby controlling engine speed. Additional information: The throttle's function is to control the cylinder's filling volume by adjusting the carburetor's throttle opening and to regulate the fuel flow through the fuel regulator, determining the engine's output power and generating thrust.

[McColton]

Oh, I've personally experienced this issue before with my old car. It would often stall when releasing the accelerator, especially when stopping at red lights, which was quite startling. Later I discovered it was usually caused by a faulty idle control system - that component is responsible for maintaining minimum engine RPM when you're not pressing the accelerator. If carbon buildup is too severe or sensors age, it may malfunction, causing the engine to stall directly. Other possibilities include vacuum line leaks or insufficient fuel supply from the fuel pump, making the engine stall at low speeds. I recommend starting with simple checks: see if the air filter is clogged, or try cleaning the throttle body. During daily driving, pay attention to whether the idle is stable. If you notice any abnormalities, it's best to visit a professional repair shop early to avoid being stranded on the road and compromising safety. Additionally, regular engine maintenance can prevent most such problems - spending a little money now saves big trouble later.

[ZoeRose]

From my experience, there are several common causes for a vehicle stalling when the throttle is released: a stuck or clogged idle control valve can cause unstable engine RPM; vacuum leaks in the intake tract can disrupt idle balance; severe carbon buildup on spark plugs may lead to ignition failure and stalling; fuel system issues like clogged filters or pressure drops add further risk. When troubleshooting, I usually first check if the warning light is on, then use a multimeter to test sensor voltages. If no abnormalities are found, I proceed to clean components around the mass airflow sensor. In daily driving, developing the habit of waiting for the idle to stabilize before moving off can reduce risks. The key is not to delay repairs, as this may lead to chain reactions like accelerated engine wear. For non-professionals, I advise against DIY attempts—prioritize safety by promptly consulting a trusted mechanic for diagnosis.

[DiAdam]

Stalling when releasing the accelerator? So annoying! My previous car had the same issue. After troubleshooting, it was mostly related to idle speed components acting up, like a faulty throttle position sensor sending inaccurate signals causing random stalling. It could also be an aging fuel pump causing intermittent fuel supply and unstable low-speed performance. Quick fix: Try replacing the air filter yourself to see if it helps. If not, then take it for professional repair. Most importantly, don't push through and keep driving - safety always comes first.