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 the Engine to Buzz on Its Own After Shutting Off?

2 Answers

RafaelRose

07/28/25 4:52pm

The reasons for abnormal engine noise after the car is turned off are as follows: 1. Loose screws at the three-way catalytic converter interface: Thermal expansion and contraction after shutdown can make the noise more noticeable. Solution: Tighten the screws. 2. Damaged carbon canister solenoid valve: This can easily cause the fuel tank to deform and produce noise. Solution: Replace the carbon canister solenoid valve. 3. Poor operation of the starter's pull-in motor: The pull-in motor is used to engage the starter gear with the engine flywheel. After shutdown, the pull-in motor should disengage. If it operates poorly, it can easily cause abnormal noise. Solution: Replace the pull-in motor. 4. Uneven engine cooling causing noise: After driving for a while, the engine temperature is very high. After shutdown, the temperature of each component decreases, and thermal expansion and contraction cannot occur at a uniform rate. This inevitably leads to gaps between internal metal parts of the engine, causing friction and abnormal noise due to cooling contraction.

Was this review help?

12

0

Share

VonMaddox

08/11/25 11:30pm

Last time I turned off the engine, I also heard a buzzing sound. After researching, I found that this is usually because the vehicle's cooling fan continues to run to provide cooling for the engine or turbocharger, preventing overheating damage to components. Especially after high-speed driving in summer, the engine temperature is very high, and the fan will automatically operate for a period of time, generally ranging from 30 seconds to 2 minutes, which is completely normal design. Other possible reasons include residual fans from the air conditioning system or the fuel pump releasing pressure. If the sound is abnormal, such as lasting too long, being too loud, or accompanied by strange odors, it is necessary to check for short circuits in the circuit or battery issues. It is recommended to pay attention to the source and duration of the sound. In most cases, there is no need to worry, but if there are long-term abnormal sounds, it is best to go to a professional shop for a circuit check to ensure safety and avoid small problems turning into major faults.

Was this review help?

10

0

Share

Expand All

More Forum Discussions

How to Use the + and - in D Gear?

D gear "+" and "-" symbols are unique to manual-automatic transmission models, representing upshift or downshift. The manual-automatic transmission is a type of automatic transmission that essentially adds the function of manual gear shifting, where "+" means increasing one gear. On flat roads, you should always keep it in D gear, as the automatic transmission will switch between the four forward gears on its own, without manual intervention. The descriptions of automatic transmission gears are as follows: 1. P——Parking: Parking gear, starting gear. When you park and do not use the car, the gear is in this position, at which time the wheels are mechanically locked to prevent rolling. 2. R——Reverse: Reverse gear. Used when reversing. 3. N——Neutral: Neutral gear. Used when temporarily stopping (such as at a red light). Note that this gear position indicates neutral, and to prevent the vehicle from rolling on a slope, you must step on the brake.

Why is the Mazda screen black?

Mazda screen black screen is most likely due to poor line contact, it is necessary to check in time whether the line appears virtual connection. You can turn off the vehicle and then restart it. The following is the relevant introduction about Mazda maintenance: 1. Check the antifreeze: The amount of antifreeze must be appropriate. The maintenance station recommends that the antifreeze be replaced every two years, but the mixed antifreeze (especially the one added with water in summer) must be replaced every year. Note that products of different brands and models should not be mixed. Next is the engine oil. The lubrication requirements for the engine oil in winter are higher. If summer engine oil is used, it must be replaced. Engine oil that has been used for a long time, turns black, and has poor adhesion should be replaced to ensure smooth engine starting. 2. Replace high-grade gasoline: If 90-grade gasoline is usually used, it can be replaced with 93-grade oil. Because the ambient temperature of the car in winter is lower, the use of high-grade gasoline has a higher ignition point and stronger ignition ability.

How Often Should a Car's Engine Be Cleaned?

An engine should be cleaned every 20,000 to 40,000 kilometers, and the cleaning interval should be adjusted based on actual conditions. Here is some information about engine cleaning: 1. Reasons for Cleaning: During engine operation, the high-temperature working environment, wear caused by the relative motion and friction of moving parts, and the combustible gas mixture that enters the crankcase from the cylinders can all affect the performance and quality of the engine oil. When the performance and quality of the oil decline, its ability to clean the oil passages also decreases, eventually leading to sludge buildup in the engine's lubrication system. In severe cases, this can even block the oil passages. 2. Recommendations: There is no need to be overly concerned about sludge buildup in the engine. New cars or those with low mileage do not require cleaning. However, it should not be ignored either. For cars that are 3-5 years old or have a mileage of 50,000 kilometers, engine cleaning is still necessary.

How many gears does the CFMOTO 250 have?

CFMOTO 250 has 6 gears. Usage of different gears: The same RPM corresponds to different speeds in different gears. Start in first gear and accelerate to 20-30 km/h before shifting to second gear. Pull second gear to 30-40 km/h before shifting to third gear, and so on until pulling fifth gear to 60-70 km/h before shifting to sixth gear. Introduction to CFMOTO 250: The 250 features a more sport-oriented riding position with a seat design that allows the rider to lean forward more, enabling the rider to effectively grip the bike during aggressive riding, thereby enhancing the sense of control. The 250 performs significantly better in vibration suppression compared to its peers, and each gear is very distinct, providing a crisp and responsive feel during riding without any sluggishness.

What Causes Lack of Power at High Speed in Motorcycle Carburetors?

Motorcycle carburetor lack of power at high speed can be attributed to the following reasons: Exhaust pipe blockage: After prolonged use, the exhaust pipe of a motorcycle can accumulate severe carbon deposits. These deposits, along with dust and grime, can clog the exhaust pipe, leading to poor acceleration. In such cases, you can use a drain hook to reach into the exhaust pipe and clean out the carbon deposits and dust. Another method is to burn off the carbon deposits at high temperatures, as the heat will cause them to flake off. Air filter displacement: A clogged air filter occurs when the foam inside gets blocked by dust, causing the rubber tube to bend and obstruct airflow. In this situation, you can clean the foam of the air filter. If the intake hole has been displaced due to bumps, take it to a repair shop to have a mechanic reinstall it properly.

What problems can occur with throttle valve failure?

Throttle valve failure generally leads to: 1. The car cannot start, or after starting, the throttle valve inside does not return when the accelerator is pressed. 2. Black smoke emission and high fuel consumption. 3. High idle speed and unsteady acceleration. Relevant information about the throttle valve is as follows: 1. Definition of the throttle valve: The throttle valve controls the engine's air intake. Based on computer signals, it adjusts the mixture ratio of gasoline and air to ensure complete combustion of gasoline and generate power. In fact, every time a driver presses the accelerator, they are not pressing "fuel" but "air," compressing a certain amount of air into the engine through accelerator pressing and gear shifting. 2. Causes of throttle valve failure: Mostly, it is due to carbon deposits inside the throttle valve. The problematic throttle valve's interior is covered with black carbon powder from incomplete combustion. Prolonged use of the throttle valve and poor driving habits of the owner are the main causes of carbon deposits.

Trending Ranking

What to Do When the Warning Light Is On but Does Not Affect Normal Driving?

Which Button to Press for Foggy Rearview Mirrors?

How to Check Driver's License Information If It's Lost?

How to turn off the rear lights of the Volkswagen Magotan?

What is the name of Volkswagen's newly released SUV?

Is the validity period of driving test study three years and six months?

What are the penalties for a sedan carrying 6 people (overloading)?

How to Check the Production Date of Hankook Tires?

What does a gecko sticker on the back of a car mean?

Does Buying a BYD Han Come with a Free Charging Station?

More Forum Discussions

What should be paid attention to during the running-in period of a new car?

What is the fuel consumption of the 2.3T Mustang?

Can I schedule the Subject 4 exam in another location through 12123?

Do Motorcycles Suffer from Altitude Sickness?

Help

Cookie

Cookie Settings

© 2025 Servanan International Pte. Ltd.