What are the reasons for no response when turning the car key to start the engine?

What is the P gear in an automatic transmission?

The P gear in an automatic transmission is the parking gear. The P gear evolved from the N gear. In addition to placing the transmission in neutral mode, it also has a pawl inside the transmission that locks the gear on the output shaft, forming a mechanical lock. This secures the drive axle, preventing the vehicle from moving or slightly shifting. Forced braking: In automatic transmission cars, the key can only be removed when the gear is shifted to P, effectively forcing the driver to ensure the vehicle is stationary before leaving with the key. Neutral ignition: In automatic transmission models, the engine can only be started in P or N gear, preventing sudden vehicle movement that could cause accidents. Usage method: All gear operations related to P gear require the cooperation of the brake pedal and the button on the gear lever or the downward pressure of the shift handle. To engage P gear, press the brake pedal, then hold the safety button on the gear lever or press down the shift lever to move to any other gear, preferably completing the action in one go.

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What is the normal RPM for an automatic transmission car?

For automatic transmission cars, an RPM of around 1800 to 2000 is normal, but the required speed varies depending on different road conditions. The engine RPM should match the current gear; otherwise, driving at high speed in a low gear or at low speed in a high gear can cause unnecessary damage to the vehicle. The engine RPM relates to the number of work cycles per unit time or the effective power output of the engine, meaning the effective power of the engine changes with different RPMs. Therefore, when specifying the effective power of an engine, the corresponding RPM must also be indicated. During a cold start, the idle speed of a car is mostly between 1200-1500 rpm. This is because when the car starts, the engine temperature is low, and the higher speed helps quickly raise the engine temperature. An automatic transmission car can shift gears freely when the RPM reaches around 1800 to 2000 rpm. The gear shifting in an automatic transmission car is determined by the computer (or chipset) based on the current speed, RPM, and throttle input.

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Can You Shift from D to N While Driving an Automatic Transmission Car?

It is not advisable to shift from D (Drive) to N (Neutral) while driving an automatic transmission car. If you shift the gear from D to N while the vehicle is in motion, the rapidly rotating passive components will not receive sufficient lubrication, leading to increased temperature inside the transmission and potential damage. Parking Steps: Select a parking spot and move your right foot from the accelerator to the brake pedal. Apply the brake gradually based on speed and distance, except in emergencies. Once the car comes to a complete stop, firmly press the brake to prevent the vehicle from rolling. For long-term parking, after the car has stopped completely, engage the parking brake, turn off the engine, and shift the gear lever to P (Park) position. Starting Procedure for Automatic Transmission Cars: Press the brake pedal with your right foot. To move forward, shift the gear lever to D (Drive) position; to reverse, shift it to R (Reverse) position. Release the parking brake. Slowly release the brake pedal (allowing the car to move gently using inertia). Move your right foot to the accelerator pedal and press lightly to proceed.

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Does Idle Start Hurt an Automatic Transmission Car?

Idle start can indeed harm an automatic transmission car. During startup, the engine speed drops instantly, causing abnormal noises from the engine. The fuel cannot be fully burned, leading to carbon deposits. Correct procedure for starting an automatic transmission car: First, turn the key to the second position to allow the car's computer system to begin self-checking, which takes at least 5 seconds. Then, press the foot brake and shift the gear from P to N (for reverse, you can directly start the engine in P gear). After releasing the foot brake, turn the ignition key to the start position to fire up the engine. Next, press the foot brake, release the handbrake, and shift from N to D. For cars with a one-button start, press the foot brake and shift from P to D. Gradually release the foot brake to start moving. For prolonged idling in an automatic transmission car, shift to P gear. P gear is a special position that mechanically locks the transmission output shaft to secure the vehicle, functioning as a parking brake to prevent the car from moving.

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What Do the Left and Right Feet Control in an Automatic Transmission Car?

In an automatic transmission car, the left foot is not used for pedals, while the right foot controls both the accelerator and the brake. This design ensures that when the brake is pressed, the accelerator must be released, and vice versa, preventing the possibility of mistakenly pressing both pedals simultaneously in emergency situations. For beginners learning to drive, it is advisable to practice under the guidance of an instructor or an experienced driver in a spacious, open area after calming any nervousness. Never drive alone as a novice. Otherwise, if a beginner becomes nervous and mistakenly presses the accelerator instead of the brake, the consequences could be disastrous. Additionally, when driving, if the right foot is not on the accelerator, it should immediately be placed on the brake pedal. Avoid leaving it idle on the floor mat to prevent frantic pressing in urgent situations. When switching between the accelerator and the brake, avoid lifting the entire leg. The standard posture involves keeping the heel stationary and pivoting the foot to press either pedal. Many people tend to lift their foot when switching between the two, which can lead to inaccuracies and mistakes, especially when distracted.

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What Causes a Lean Air-Fuel Mixture in Cars?

The main causes of a lean air-fuel mixture are insufficient fuel injection, inaccurate detection of intake air volume by various intake sensors leading to inadequate fuel injection, excessive carbon buildup that absorbs fuel, and failure of the oxygen sensor's closed-loop control. Here are some relevant details: 1. The air-fuel mixture in cars refers to the gaseous mixture of atomized automotive fuel and air. When the concentration of fuel in the mixture is significantly lower than the fixed value, this is referred to as a lean air-fuel mixture. 2. When the mixture is too lean, the combustion speed of the fuel decreases, and some of the mixture's combustion occurs as the piston moves toward the bottom dead center. This portion of combustion not only converts less heat into mechanical work but also loses more heat to the cooling water or radiator through the cylinder walls. Therefore, an excessively lean mixture can cause engine overheating and reduced power output. 3. A lean mixture can also result in higher idle speeds, and when accelerating or releasing the throttle, the engine speed may take longer to return to idle speed.

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What are the reasons for no response when turning the car key to start the engine?

What is the P gear in an automatic transmission?

What is the normal RPM for an automatic transmission car?

Can You Shift from D to N While Driving an Automatic Transmission Car?

Does Idle Start Hurt an Automatic Transmission Car?

What Do the Left and Right Feet Control in an Automatic Transmission Car?

What Causes a Lean Air-Fuel Mixture in Cars?

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