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What is the normal RPM for starting an automatic transmission car?

3 Answers

BlakelyAnn

07/29/25 4:09pm

Automatic transmission cars typically start between 1500-2000 RPM, which is both fuel-efficient and smooth, causing no damage to the engine. Automatic transmission vehicles have their own idle speed. There's no need to press the accelerator when starting, and as long as the RPM doesn't exceed 2000, it's considered normal. Here are some related details about automatic transmissions: 1. There are certain usage requirements and techniques for automatic transmissions. When shifting gears in an automatic vehicle, shift to 2nd gear when the speed reaches 20 km/h and the RPM is between 1500-2000. Shift to 3rd gear when the RPM exceeds 2000, which is close to 30 km/h. Similarly, shift to 4th gear when the speed reaches 50 km/h. This is because shifting at 2000 RPM can easily cause carbon buildup, so the fuel-efficient and suitable RPM range is between 1500-2000 RPM. 2. For a new automatic transmission car during the initial break-in period, it's best not to exceed 2200 RPM. During the mid break-in period, avoid exceeding 3000 RPM, and it's also recommended not to exceed 3000 RPM during the later break-in period.

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Jimenez

08/15/25 4:32am

In the past few years of driving automatic transmission cars, I've noticed that the RPM is normally between 1000 and 1500 when starting. Especially during a cold start, the engine might run slightly higher, around 1500 RPM, and then drops back after 20-30 seconds. When starting, don't rush to press the accelerator pedal hard; ease into it to keep the RPM stable below 1500, then gradually accelerate once the car starts moving. If the tachometer shoots up to over 2000 RPM when starting but the car still lacks power, or if the engine sounds unusually loud, it's likely due to excessive carbon buildup or a dirty air filter that needs replacing. Regularly checking the condition of the transmission fluid is also important, as deteriorated fluid can affect the smoothness of the start.

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Judy

10/12/25 6:03am

Last time I went for maintenance, I also chatted with the mechanic about this. Normally, automatic transmissions start at around 1,000 RPM. When the weather is cold or the air conditioning compressor is running, the starting RPM might be a bit higher, and it's common to see around 1,600 RPM. However, if the RPM exceeds 2,000 every time you start, and this persists for more than half a year, then something might be wrong. My former colleague's CVT car had this issue, and it turned out to be unstable hydraulic torque converter oil pressure. Additionally, when the auto start-stop system is activated and the vehicle restarts, the RPM might briefly surge to around 1,800 RPM, which is normal and nothing to worry about, as the instant ignition does require more power.

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More Forum Discussions

What Causes Difficulty Starting Due to Low Idle Speed?

The reasons for difficulty starting due to low idle speed are as follows: Intake Manifold or Various Valve Leaks: When air, gasoline vapor, or combustion exhaust that should not enter the intake manifold infiltrates, it causes the air-fuel mixture to become too rich or too lean, leading to abnormal engine combustion. If the leak affects only certain cylinders, the engine may experience severe shaking, particularly impacting cold-start idle conditions. Excessive Carbon Buildup in Throttle Body and Intake Passage: Excessive carbon deposits and dirt in the throttle body and surrounding intake passages alter the cross-sectional area of the air passage, preventing the control unit from precisely regulating idle air intake. This results in an overly rich or lean mixture and abnormal combustion. Common causes include: oil contamination or carbon buildup on the throttle body; oil or carbon deposits in the intake passages around the throttle body; and oil or carbon buildup on the idle speed stepper motor, duty cycle solenoid valve, or rotary solenoid valve.

How to Drive an Automatic Transmission Car for Fuel Efficiency?

Methods for saving fuel in an automatic transmission car: 1. Shift gears appropriately: Generally, the basic gears of an automatic transmission car are P (Park), R (Reverse), N (Neutral), and D (Drive). It's important to use the automatic gearshift properly to save fuel more efficiently; 2. Avoid sudden acceleration: Since automatic transmission cars shift gears automatically, there is a certain interval during the process. Therefore, avoid stomping on the accelerator pedal suddenly, as it will increase fuel consumption; 3. Avoid hard braking: Excessive braking increases fuel consumption, so it's better to maintain a steady speed while driving and use gentle braking whenever possible; 4. Coast downhill in D gear: Coasting in neutral not only fails to save fuel but also increases some risks. A more fuel-efficient method is to coast downhill at a certain speed while keeping the car in D gear and releasing the accelerator pedal, allowing the engine to automatically cut off fuel supply.

Can Dishwashing Detergent Be Used for Car Washing?

Dishwashing detergent should not be used for washing cars. Dishwashing detergent is an alkaline cleaning agent that can cause significant damage to car paint. If used for car washing over a long period, the car's surface will gradually lose its shine. The hazards of using dishwashing detergent for car washing are as follows: 1. Damage to Car Paint: Dishwashing detergent has the effect of removing oil stains. Because of this characteristic, it can also strip away the car wax that protects the paint. Once the wax is removed, the paint becomes vulnerable to damage, and the car may lose its original luster or even develop a whitish appearance. 2. Corrosion of Rubber Protective Strips: Dishwashing detergent is alkaline and can corrode the rubber protective strips on the car body, causing them to discolor, lose elasticity, or even break. For this reason, professional car washes use neutral cleaning products that protect the car's surface. 3. Difficulty in Thorough Cleaning: Dishwashing detergent produces abundant foam, and self-washing is often limited in scope, making it difficult to clean the car thoroughly. After drying, streaks may appear, affecting the car's appearance.

What Causes the Popping Sound from the Exhaust Pipe When Letting Off the Throttle?

The popping sound from the exhaust pipe when letting off the throttle can be caused by various reasons, including aging of the exhaust pipe, malfunction of the car's three-way catalytic converter, issues with the ignition system, or abnormal concentration of the air-fuel mixture. The specific causes are as follows: Aging of the Exhaust Pipe: When a car is too old, the exhaust pipe is prone to aging, which can lead to loosening, detachment, or holes, ultimately causing abnormal noises from the exhaust pipe. This issue is relatively simple to resolve—just re-secure or replace the exhaust pipe. Malfunction of the Car's Three-Way Catalytic Converter: If the three-way catalytic converter malfunctions, it cannot properly purify exhaust gases, leading to blockages and pressure buildup inside, which causes abnormal noises from the exhaust pipe. In this case, it is necessary to visit a repair shop or a 4S store for professional inspection and repair.

Which gear is the forward gear in an automatic transmission car?

In an automatic transmission car, the D gear is the forward gear. The D gear is the commonly used gear position. When you shift into D gear and press the accelerator, the car will move forward. The P gear is the parking gear, generally used when turning off and parking the vehicle. Many vehicles require shifting into P gear before power can be turned off, the key can be removed, and the doors can be locked. After shifting into P gear, the vehicle's transmission will be locked. The R gear is the reverse gear, used when reversing. When this gear is engaged, the car can move backward. The N gear is the neutral gear, which means the vehicle's gear lever is not placed in any forward or reverse gear position. The S gear is the sport gear, also known as sport mode. When this gear is engaged, the car will shift up slowly or downshift early, keeping the engine at higher RPMs and increasing torque output to obtain greater power, commonly used when overtaking. The L gear is the low gear, also known as the climbing gear. Its function is to reduce speed and increase torque, commonly used when climbing hills (equivalent to the 1st gear in a manual transmission).

What is the function of the automatic transmission handle button?

The function of the automatic transmission handle button is to prevent incorrect gear shifting. The benefits of preventing incorrect gear shifting include: 1. Protecting the transmission, preventing damage to transmission gears, and extending the lifespan of the transmission; 2. Eliminating potential safety hazards caused by misoperation. If the gear is shifted incorrectly, the vehicle may unexpectedly move forward or backward, which could lead to accidents. The button on the automatic transmission handle is called the lock button, also known as the gear lock. Situations where the automatic transmission handle button needs to be pressed: 1. When shifting into R (Reverse) gear; 2. When shifting out of P (Park) gear; 3. When shifting into P (Park) gear. In these three scenarios, the button must be pressed to shift gears. Gears that could potentially cause reverse impact to the transmission will be locked, and the lock button must be pressed to unlock during gear shifting. For example: shifting from R to P requires pressing the button; shifting from P to R requires pressing the button; shifting from R to D (Drive) does not require pressing the button; shifting from D to N (Neutral) does not require pressing the button.

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