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What are the reasons for an automatic transmission car stalling at startup?

1 Answers

DiEleanor

07/30/25 12:44am

Common reasons for an automatic transmission car stalling are as follows: 1. Circuit failure, possibly due to low-voltage power outage or quenching during driving. In this case, mainly check the ignition switch, start switch, and fuse box. Stalling caused by a short circuit in the low-voltage circuit is intermittent, so inspect the vehicle's low-voltage lines. 2. Equipment failure, usually related to the ignition coil, capacitor, or electronic ignition module. The car may start initially but stall after a while, then restart only to stall again. 3. Fuel system failure, such as a damaged fuel pump, ruptured pipeline, clogged carburetor inlet, or empty fuel tank. In such cases, the car can be restarted but with difficulty. Problems with the ignition system or engine overheating and anti-knock system can also cause stalling. Steps to take after stalling: 1. For an automatic transmission car, immediately turn on the hazard lights to alert following vehicles when stalling is detected. 2. Step on the brake to stop the car as quickly as possible, then turn the key to restart. Stalling may be due to issues with the engine speed sensor or excessive dirt, problems with the idle control program in the engine electronic control unit, or fuel quality issues may also cause stalling.

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What is the working principle of a brake relay valve?

Working principle of the brake relay valve: When the brake pedal is pressed, the output air pressure from the brake valve serves as the control pressure input for the relay valve. Under the control pressure, the intake valve is pushed open, allowing compressed air to flow directly from the air reservoir into the brake chamber through the intake port, bypassing the brake valve. This significantly shortens the air filling path for the brake chamber and accelerates the air filling process. Below is an introduction to the brake relay valve: 1. Function: The relay valve is part of the vehicle's air brake system. In the braking system of heavy-duty vehicles, the relay valve serves to reduce reaction time and pressure buildup time. 2. Differential relay valve: It prevents simultaneous operation of the driving and parking systems, overlapping forces in the combined spring brake cylinder and spring brake chamber, thereby avoiding overloading of mechanical transmission components and ensuring rapid filling and exhausting of the spring brake cylinder.

What are the reasons for a car not starting due to fuel supply issues?

Reasons for a car not starting due to fuel supply issues are as follows: 1. Fuel quality issues: Remind car owners to always refuel at reputable gas stations. When traveling, you can use a gauze wrapped around the fuel nozzle to filter out impurities. 2. Dead battery: This could be due to leaving headlights on for extended periods, resulting in a drained battery, or the battery reaching the end of its lifespan. It is generally recommended to replace the battery every 2 years. Additionally, installing xenon headlights, high-power audio systems, or DVD players can also cause vehicle circuit failures. 3. Incorrect gear position: When starting an automatic transmission car, the gear must be in P (Park) or N (Neutral). If it is in R (Reverse) or D (Drive), the car will not start. Some manual transmission cars may also fail to start if the clutch is not depressed.

What to Do When the At-Fault Driver Doesn't Answer Calls?

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How often should fuel system cleaner be added?

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How to Determine the 30cm Distance Between the Car Body and the Roadside?

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What do LH and RH mean in cars?

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