Browse

Antiques Collectibles Apparel Baby Kids Items Books， Movies And Music Electronics Free Stuff Garden Outdoor Health Beauty Home Goods Home Improvement Supplies Musical Instruments Office Supplies Pet Supplies Sporting Goods Ticket Toys Games Transportation Others

Used Cars New Cars Others

Business Crafts Design And Web Events Home Improvement Legal Lessons Personal Pets Photography Repair And Technical Support Wellness Writing， Translation， And Transcription Others

Activities & Groups Artists & Musicians Classes & Lessons Events Friendship & Networking Lost & Found Rideshare Sports Teams Volunteers Travel & Travel Partners Skills & Language Swap Other

Why has the idle speed of the car increased?

2 Answers

EzraMarie

07/28/25 9:40pm

The increase in idle speed of a car may be due to a dirty or faulty throttle, which causes abnormal idle speed. Other reasons for the increase in idle speed of a car: Malfunction of the idle control valve. Normally, electronic fuel injection engines determine the normal idle speed of the car through the idle control valve. During driving, the electronic control unit calculates based on the information transmitted by the car engine to adjust the intake air volume and change the idle speed of the engine. However, if oil stains or carbon deposits affect the idle control valve, the electronic control unit cannot receive accurate information, thereby affecting the adjustment of idle speed. In this case, the idle speed will become too high. Solutions for the increase in idle speed of a car: Adjust or replace the throttle position sensor; clean or replace the idle control valve and use a special decoder to perform basic settings for the idle speed; find the leakage point, reseal or replace related components; check the timing marks and readjust the valve timing according to standards; clean and check the fuel injection volume of each injector to ensure there is no blockage or leakage; replace the three-way catalytic converter; remove carbon deposits on the EGR valve or replace the EGR valve.

Was this review help?

9

0

Share

DelRylee

08/12/25 2:16am

Last time my car's idle speed suddenly increased, which really confused me. An experienced driver told me it might be due to a dirty throttle body - when the throttle response lags, it can cause unstable idling. It could also be a problem with the mass airflow sensor; if it misreads the intake air volume, the ECU will inject more fuel. Another common issue is a faulty coolant temperature sensor - if it sends false low-temperature signals, the engine control unit will automatically increase RPM to warm up the engine. The most troublesome case is vacuum hose leakage; my old Lavida had this problem, making the idle speed fluctuate like a roller coaster. It's recommended to first read the trouble codes. If you want to DIY, you can try cleaning the throttle body. If that doesn't work, you'll need to take it to a professional shop to check the sensors and hoses.

Was this review help?

6

3

Share

Expand All

More Forum Discussions

What features does the Skoda Octavia have?

Skoda Octavia features Anti-lock Braking System (ABS), Electronic Brakeforce Distribution (EBD), Engine Drag Torque Control (EDTC), and Traction Control System (TCS) with engine intervention. Anti-lock Braking System: Prevents wheel lock-up during emergency braking, allowing the vehicle to maintain steering control and avoid skidding or fishtailing while braking. Electronic Brakeforce Distribution System: Independently distributes braking force to each wheel and continuously adjusts at high speed according to road conditions, ensuring smooth and safe vehicle operation. Engine Drag Torque Control System: Identifies slip rates via ABS sensors and automatically reduces engine drag torque through the CAN data bus, thereby decreasing slip rates and ensuring driving stability.

Why is the Jetta blower not working?

Car blower suddenly not working reasons are: fuse failure, blower relay failure, internal failure of the blower motor, power transistor or blower switch failure, wiring failure, air conditioning control unit failure, etc. The function of the car blower is: To blow the cold air from the air conditioning evaporator or the hot air from the heater core into the car. Blowers are divided into: Roots blower, blast furnace blower, magnetic levitation blower, single-stage high-speed centrifugal blower, multi-stage centrifugal blower, and air suspension centrifugal blower. The blower consists of a motor, air filter, blower body, air chamber, base, and oil drip nozzle.

How to properly activate the internet connection for the Leiling car?

Download the Fengyunxing APP, find the Fengyun Enjoy feature inside, where you can locate the activation option. Bind your vehicle information on Fengyunxing, and authenticate it in the certification center to start using it. The App allows you to check your vehicle's information and location anytime. The new Leiling is equipped with an internet of vehicles function. There is an SOS button on the roof with a light next to it. When starting, if it shows a green light, it means the internet of vehicles is functioning normally. A red light indicates unsuccessful connection. This operation requires the 4S shop to report the car's VIN to the GAC backend for registration, otherwise, registration failure may occur.

What to Do When the Windows Fog Up?

Here is the relevant introduction about car window fogging: 1. Air Conditioning Defogging: This is the simplest method. Just turn on the front window defogging mode, set the fan speed to maximum, turn on the A/C switch, and adjust the temperature to the lowest. The fog on the windows will disappear shortly. Additionally, some models have electric heating for the rear window and side mirrors. Simply press the switch, and the fog will clear in about a minute. Many vehicles now also feature a one-touch defogging function, which is convenient and quick to use when fogging occurs. 2. Air Convection: This method is suitable for very few situations. Opening the windows increases air convection, reduces the temperature difference inside and outside the car, and weakens the conditions for fog formation. While this method seems economical, it is rarely practical. For example, if it is raining outside, you cannot keep the windows open, and the incoming air is quite limited. 3. Defogging Spray: Simply spray it evenly on the glass surface and wipe it clean with a dry towel. The principle involves using surfactants to leave a protective film on the glass surface, altering the surface tension of water molecules, causing fog droplets to coalesce into larger droplets that do not obstruct vision. This can also be applied to other car windows, especially the side mirrors. 4. Homemade Defogging Spray with Dish Soap: Mix dish soap and water in a 1:6 ratio, store it in a bottle, and spray and wipe before traveling. The effect is comparable to commercial defogging sprays, though the durability is slightly inferior.

Is the Compass a Joint Venture Vehicle?

The Jeep Compass is a joint venture vehicle, an SUV model jointly produced in China by China's GAC Group and Italy's Fiat Chrysler Group. About the Compass model: The Jeep Compass is a relatively good compact SUV, with its main advantages being off-road performance, along with a stylish interior, user-friendly infotainment system, and stable fuel economy. However, it also has some notable drawbacks, including uneven power transmission, slow acceleration, below-average cargo space, and reliability levels that fall short of expectations. Definition of a joint venture vehicle: A joint venture vehicle is a project jointly established by a Chinese party and a foreign investor. The Chinese party contributes by providing land and factory usage rights, as well as capital, while the foreign investor contributes the brand, technology, capital, talent, etc. Joint venture vehicles are the products of such collaborations. The foreign party provides technology, talent, brand, etc., for assembly within the country, but the core technology remains under foreign control. Examples of joint venture vehicle brands include Dongfeng Yueda Kia and Shanghai Volkswagen.

What are the reasons why the sunroof of a Mercedes-Benz GLE cannot be closed?

The reasons why the sunroof of a Mercedes-Benz GLE cannot be closed are as follows: 1. It is best not to fully open the sunroof on bumpy roads, as excessive vibration between the sunroof and the sliding rails may cause deformation of related components or even damage the motor. Always open the sunshade before opening the sunroof to prevent overloading the motor, which could lead to malfunctions over time. 2. In winter, after rain or snow, the sunroof is prone to freezing, and the sealing strip may become frozen and hard. Opening the sunroof immediately in such conditions can cause the rubber seal to crack. If the sunroof is frozen, the motor may be damaged due to overload. It is advisable to turn on the heater first and wait for the ice on the sunroof to melt before opening it. 3. When washing the car with a high-pressure water gun, avoid directing the water jet directly at the sealing ring. This can cause the sealing ring to deform under the high pressure, leading to water leakage into the car and potential damage to the sealing ring. 4. There are four drainage channels at the corners of the sunroof that direct accumulated water outside the vehicle. If these channels are blocked by leaves, dust, or if the water volume exceeds the designed drainage capacity, water may overflow, causing roof leakage. In severe cases, this can lead to water ingress. Since sunroof components are sliding mechanisms, they are relatively susceptible to water infiltration and aging. Regularly cleaning the drainage outlets can help prevent the sunroof from failing to open.

Trending Ranking

What are the differences between the J11 and J15 models of the Shadow Leopard?

How many kilometers can a G63 run on a full tank of fuel?

What are the gear operation techniques for Cadillac XT5?

Where is the noise reduction position of Honda CRV?

How to Remove the Front Bumper of a Nissan Sylphy?

What are the consequences of not conducting annual vehicle inspection or scrapping?

What is the maximum speed of the Wuling Hongguang S?

Is the Audi A3 fuel-efficient?

What are the functions of the multi-function steering wheel buttons on the Song Pro?

What is the difference between the Q3 Sportback and Q3?

More Forum Discussions

Which button is for heating in the Envision's air conditioning?

Does the Mercedes-Benz C200 require air bleeding when replacing the electronic water pump?

Will BMW headlights turn off automatically after the engine is turned off?

What tires does the Axela use?

Help

Cookie

Cookie Settings

© 2025 Servanan International Pte. Ltd.