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

What Causes Abnormal Noises During Engine Idling?

1 Answers

DiLeilani

07/30/25 3:54am

Engine idling abnormal noises can be attributed to the following specific reasons: 1. Loose fasteners: Vibration during engine operation may cause certain components to loosen, resulting in abnormal noises. 2. Deformation or damage of individual parts: Abnormal noises may occur due to deformation or damage of certain components. 3. Improper assembly, adjustment, or repair: Incorrect assembly, adjustment, or repair can lead to misalignment of component clearances. 4. Excessive clearance: Clearance is a critical indicator of automotive assembly quality. When factors such as lubrication, temperature, load, and speed are constant, abnormal noises become more pronounced as clearance increases. Natural wear of certain moving engine components can cause clearance to exceed acceptable limits, leading to noises such as piston slaps against cylinder walls or connecting rod bearing impacts on journals. 5. Poor lubrication: Lubrication is essential for normal engine operation, providing functions like cooling, cleaning, sealing, and rust prevention through the lubrication system. When clearance, temperature, load, and speed are constant, the thickness of the lubricating oil film depends on the lubrication system pressure and oil quality. High-quality lubricants and appropriate pressure create a thicker oil film, reducing mechanical impacts and minimizing abnormal noises. Conversely, an excessively thin oil film accelerates wear, resulting in noticeable and clear abnormal noises.

Was this review help?

15

3

Share

More Forum Discussions

What Causes High Idle Speed in Cars?

Here is a detailed explanation of the causes and solutions for high idle speed in cars: 1. Throttle valve sticking or not closing properly: If the engine idle speed drops to normal when the throttle lever is pushed in the closing direction, it indicates throttle valve sticking or improper closure. Solution: Replace the cable, remove the sticking parts, and clean the throttle body. 2. Additional air valve malfunction. Solution: Replace the additional air valve. 3. Idle speed control valve failure: Check for the sound of the idle speed control valve operation. If there is no sound, the control valve is faulty. Solution: Replace the control valve. 4. Water temperature sensor failure. Solution: Input an artificially low water temperature signal to the ECU. 5. Air conditioning switch or power steering pressure switch failure. 6. Crankcase forced ventilation valve failure. Solution: Replace the crankcase forced ventilation valve. 7. Air intake system leakage. Solution: Locate the leak, reseal or replace the relevant components. 8. Generator charging voltage too low. Solution: Inspect and repair the engine.

What are the reasons for insufficient car tire pressure gauge?

Car tire pressure may be insufficient due to the following reasons: 1. The tire pressure has not been recalibrated. Simply recalibrate the tire pressure on the central control system. 2. If the tire pressure warning appears some time after inflating, but there is no puncture in the tire, it may be due to air leakage caused by wheel rim deformation. It is recommended to check the wheel rim and replace it if necessary. Regarding the relationship between tire pressure and car performance: 1. The relationship between tire pressure and load capacity: Tire pressure is an indicator of a car's load capacity. The load capacity of a car depends on the level of tire pressure. According to the relationship between the tire's load index, tire pressure, and load capacity, the higher the tire pressure, the greater the load capacity; the lower the pressure, the smaller the load capacity. 2. The relationship between tire pressure and car power performance: Tire pressure greatly affects the rolling resistance coefficient. When the pressure decreases, the rolling resistance coefficient increases rapidly because lower tire pressure causes greater deformation of the rolling tire, increasing hysteresis loss.

What is the emission standard for the 2017 Volkswagen Lavida?

The 2017 Volkswagen Lavida adopts the China V emission standard, while the fully redesigned Volkswagen Lavida uses the China VI emission standard. The redesigned Lavida has both China V and China VI models. Compared to the China VI models, the China V models are priced lower. However, after the launch of the China VI models, it indicates that the China VI standard is about to be implemented. Once the China VI emission standard is in place, China V models cannot be registered or licensed in some regions. Information about vehicle emission standards is as follows: 1. The letters representing vehicle emission standards are: China I is I, China II is II, China III is III, China IV is IV, China V is V, and China VI is VI. 2. The China standard is a national standard formulated based on China's specific conditions. The European standard is the common standard for member countries of the European Community. The European standard is slightly higher than the China standard.

What does passenger mean in a car?

The passenger in the car refers to the passenger seat. If it says passenger airbag, it indicates the co-pilot's airbag in the front passenger compartment; if it shows a passenger symbol with a seated figure, it represents the seat belt reminder for the front passenger and other passengers. Here is some related information about airbags: 1. Airbags are a car safety feature designed to protect occupants by automatically deploying during severe collisions. 2. The working principle of car airbags is that the sensor system continuously sends speed change information to the control unit, which analyzes and evaluates this data. 3. A car's airbag system consists of an inflation sensor and an inflation system. Its functions include: protecting occupants by reducing impact with interior objects, distributing head and chest collision forces more evenly, absorbing the kinetic energy of occupants, thereby complementing the effectiveness of seat belts.

Is Wheel Balancing Still Needed After Wheel Alignment?

Performing a wheel alignment does not necessarily require a wheel balancing. However, when replacing or repairing a tire, if the tire is removed from the rim and then reinstalled, wheel balancing must be performed. Failure to do so can cause noticeable tire vibration at certain speeds. More details are as follows: 1. Wheel alignment involves adjusting the geometric angles of the tires, steering, suspension, and other components to ensure tight contact between the tires and the ground. The installation of a vehicle's four wheels, steering mechanism, and front and rear axles should maintain specific relative positions, which are standard values set by the manufacturer. Adjusting and restoring these positions is what wheel alignment entails. 2. Wheel balancing corrects the balance of the wheel (tire and rim assembly) to ensure the tire moves concentrically. Due to manufacturing variations, the mass distribution of a wheel is not perfectly uniform. When the wheel rotates at high speeds, this can lead to dynamic imbalance, causing wheel wobble and steering wheel vibration during driving. To prevent or eliminate this phenomenon, weights are added to the wheel in dynamic conditions to correct the balance at various edges.

Is the BMW 6 Series GT Based on the 7 Series or 5 Series Chassis?

BMW 6 Series GT is based on the 5 Series chassis. More details about the BMW 6 Series GT are as follows: 1. Overview: The BMW 6 Series GT is the successor to the BMW 5 Series GT and is now part of the 6 Series product lineup for sales. This model shares the CLAR platform with the BMW 5 Series. It made its official debut at the Frankfurt Motor Show in September 2017. In terms of powertrain, there are two versions: the 30 version is equipped with a 2.0T engine paired with an 8AT transmission, delivering a maximum horsepower of 258 PS; the 40 version features a 3.0T engine matched with an 8AT transmission, producing a maximum horsepower of 340 PS. 2. Other Features: It showcases a unique aesthetic design concept with sculpted and clear contours, capturing attention at first glance. The streamlined design language combines with comfort-oriented concepts, blending luxury design style with practical functionality to meet diverse needs. When elegance and sportiness merge into one, the dream travel companion is born.

Trending Ranking

Is there a significant difference in fuel consumption between off-road tires and highway tires?

Where is the fuse box of the Besturn B50 located?

What's the reason for the Baojun 730 not accelerating and lacking power?

Can pregnant women take the driving test for Subject 2 and Subject 3?

What is the situation when the clutch makes a squeaking sound?

How to Clear the Maintenance Display on Changan CS75?

What Causes a Minor Leak Detected in the Fuel Tank Ventilation System?

Is Liang Gongfu Three-Way Catalytic Cleaner Effective?

How long does it take for water in the fuel tank to show effects?

What is the normal water temperature for a sedan?

More Forum Discussions

What Causes the Smell of Gasoline When Starting the Car?

Why can't the newly replaced driver's license from another location be found on 12123?

Can You Cross a Combination of One Dashed Line and One Solid Line?

Where is the license plate number Ji E from?

Help

Cookie

Cookie Settings

© 2025 Servanan International Pte. Ltd.