What are the reasons for the engine stalling easily?
2 Answers
Engine stalling easily is caused by: 1. Excessive carbon deposits in the throttle body, or abnormal resistance of the crankshaft position sensor leading to the disappearance of the crankshaft speed signal after the engine warms up; 2. Malfunction of the fuel pump itself, where resistance changes after prolonged operation, preventing normal operation and provision of proper fuel pressure; 3. Ignition system failure, overheating of the ignition module causing malfunction, or ignition voltage failure; 4. Abnormal throttle signal voltage or improper engine computer control; 5. Loose connections in the wiring; 6. Pressing the foot brake all the way down or holding it for a long time when braking, causing the car to stop without depressing the clutch; 7. Releasing the handbrake and clutch correctly during uphill start, but insufficient throttle application.
When I help out at the auto repair shop, engine stalling issues are quite common, mostly due to fuel system failures. If the fuel pump isn't performing well or the filter is clogged, the engine stops when fuel isn't delivered. Ignition components like burnt-out spark plugs or failing ignition coils can also cause failure to start, leading directly to stalling. A stuck idle control valve or sensor issues, such as a faulty oxygen sensor, can confuse the computer control and cause stalling. Air leaks or vacuum tube leaks causing imbalanced air intake and unstable combustion are also frequent issues. I advise car owners to first check basic items, like listening for the fuel pump sound during startup, trying new spark plugs, or cleaning throttle carbon buildup. If that doesn't work, seek professional diagnostics—safety is crucial; stopping in the middle of the road is very dangerous. Don't slack on daily maintenance; regular oil changes and electrical system checks can prevent problems before they occur.
