What Causes a Car to Start and Then Stall?
3 Answers
Car starting and then stalling may be caused by a faulty idle motor or a dirty throttle body leading to clogged idle ports. Below is an introduction to the reasons why a car starts and then stalls: 1. Solutions: Clean the throttle body and fuel injectors, replace the fuel filter, check if the spark plugs have severe carbon buildup or excessive gaps, or if there is insufficient fuel pressure or clogged fuel injectors. Clean the fuel pump's filter screen. 2. Hazards: Every time the engine stalls, the oil flows back into the oil pan. Upon restarting, there is insufficient lubrication between the crankshaft and crankshaft bearings, resulting in hard friction, which can affect the engine's lifespan.
I've been driving for over ten years and have encountered several instances where the car starts but then immediately stalls. The most troublesome issue is often related to the fuel system, like a weak fuel pump or a clogged fuel filter, preventing the engine from getting enough gasoline. Aging spark plugs are also a common culprit, failing to sustain combustion after ignition. A stuck idle air control valve or a faulty mass airflow sensor can cause the computer to misjudge and lead to stalling. I usually troubleshoot myself first: Is the battery voltage normal? Are the spark plugs fouled with carbon deposits? If trying a few times doesn't work, don't push it—pull over safely and call for help. Safety comes first, especially on highways—remember to turn on your hazard lights. Regular maintenance is key; periodic checks of the fuel pump and ignition components can save a lot of trouble. Once, I neglected spark plug maintenance and ended up stalling midway, but thankfully, nothing serious happened.
My car also frequently stalls immediately after ignition, likely due to unstable idle speed control, possibly caused by a dirty throttle body or a stuck idle valve. Fuel pressure issues like a faulty fuel pump or low fuel in the tank can also cause this. Additionally, when the battery voltage is low, the engine may stall after starting before the alternator supplies power. Sensor abnormalities, such as incorrect readings from the oxygen sensor, can cause the computer to mistakenly shut down the engine immediately. I didn’t understand this before and kept trying to start the car, which ended up burning out the starter motor, costing me 800 yuan to repair. Now I’ve learned my lesson—don’t rush to restart; first, check if any fuses are blown. If the dashboard flashes a warning light, it indicates a specific trouble code. Daily driving habits like keeping the air filter clean and changing the oil regularly can help reduce such issues. When this happens, it’s best to take the car to a repair shop and use a diagnostic tool to check, so as not to lose more by trying to save a little.
