What Causes a Car to Stall After Starting?
1 Answers
There are several potential reasons why a car may stall shortly after starting: 1. Throttle issues. For example, a clogged throttle or carbon buildup in the throttle body. 2. Problems with the ignition coil or spark plugs. Such as worn-out spark plugs or excessive spark plug gap. 3. Fuel injector issues, like clogged injectors. Any malfunction in the fuel system, ignition system, or intake system can cause this phenomenon. Additional factors that may make a car difficult to start include: 1. Battery problems. If this is the cause, the driver can check by honking the horn. If the horn sounds noticeably weaker or doesn't sound at all, it indicates insufficient battery charge. 2. Incorrect air-fuel mixture ratio, which can occur in both open-loop and closed-loop control systems. If the car's computer makes an error in judgment, it may incorrectly control the air-fuel mixture and ignition timing through actuators, reducing engine power output and causing shaking, which can also make the car hard to start. 3. Unstable voltage supply to the ignition system. This can be caused by dirty fuel injectors or a faulty carbon canister purge valve. 4. Fuel injector leakage. While normal injection is fine, leakage constitutes additional fuel supply. The more severe the leakage, the richer the air-fuel mixture becomes, making hot starts difficult. 5. Engine carbon deposits. Carbon deposits strongly adsorb gasoline. If there's significant carbon buildup on intake valves, throttle bodies, or pistons, it can adsorb some fuel, leading to an overly lean mixture that affects starting. This issue can also occur during cold starts. 6. Fuel quality. After a hot engine is shut off for a while, the engine compartment remains very hot. If the fuel is highly volatile, it can create high vapor pressure in the fuel rail. When this pressure exceeds the fuel system's pressure, vapor lock occurs, causing the fuel injectors to deliver overly lean fuel vapor, making the engine hard to start.
