···
Log in / Register

What Causes Abnormal Noise from the Exhaust Pipe at Idle Speed?

4 Answers
StTucker
07/29/25 11:16pm
The reasons for abnormal noise from the exhaust pipe at idle speed are as follows: 1. Damage to the muffler and exhaust pipe: Symptoms include hearing abnormal noise from the exhaust pipe when pressing the accelerator pedal. The noise may not be very loud, and the car may drive normally, but fuel consumption increases. Sometimes, noise may also come from the front section. 2. Aging of the heat shield: Symptoms include abnormal noise from under the engine during low-speed driving or when accelerating, especially in colder weather. It is recommended to lift the car and check if there is a heat shield between the exhaust pipe and the ground. The noise may be caused by the aging of the heat shield, and replacing it can solve the problem. 3. Damage to the exhaust pipe: Symptoms include abnormal noise when turning or moving forward, often originating from the damaged front wheel drive shaft joint.
Was this review help?
8
5
Share
LaElijah
08/16/25 1:39am
I often encounter the issue of the exhaust pipe making constant noises when the car is idling in place, which is mostly caused by loose or damaged hangers. After prolonged use, the exhaust pipe mounting hooks tend to age and fatigue, causing the pipe to hang and sway, producing that 'clunking' metal sound. Additionally, if there's accumulated water inside the exhaust pipe that hasn't been drained properly—especially in winter when condensation freezes or after short trips where water accumulates—the flow of water can also create a 'splashing' noise at idle. Another issue is corrosion; internal rust or a detached muffler baffle can cause internal looseness and rattling. I've checked it myself before, and tightening the hangers solves most of the problem. If there's no improvement, pay attention to possible damage to the catalytic converter. If left unrepaired for a long time, the noise will worsen and damage other components, even risking detachment while driving. So, it's best to have it checked as soon as possible after noticing the issue.
Was this review help?
11
0
Share
Expand All
DiAllie
10/18/25 7:53am
When it comes to exhaust pipe abnormal noise troubleshooting, as someone who frequently repairs cars, I recommend a step-by-step inspection. First, identify the sound type at idle: metal scraping usually indicates loose hangers or hooks, which can be located by manually shaking the exhaust pipe. If nothing's loose, check all fastening bolts, especially the welds in the mid-rear section. Then inspect the muffler for perforations or corrosion—internal component detachment causes drum-like vibrations. Unstable idle may amplify noises, so examine the ignition system or throttle body contamination. Never overlook the catalytic converter; blockages cause unusual sounds. A simple method is tapping pipes with a rubber hammer to locate issues. If DIY fails, visit a workshop promptly to prevent major failures.
Was this review help?
4
5
Share
Expand All
Vickie
12/01/25 8:29am
I drive my kids to and from school, so I pay close attention to the car's quietness and safety. The abnormal noise from the exhaust pipe during idle is annoying and may hide potential safety hazards. Common causes of the noise include fatigue fracture of the hanger or corrosion and water leakage in the exhaust pipe. Frequent short-distance driving can accumulate condensed water, leading to water hammer sounds. If left untreated, increased vibration may cause the pipe to detach, damaging the chassis or even causing injury. During regular maintenance, I ask the mechanic to reinforce the exhaust pipe mounting points to prevent corrosion. Prevention is simple: avoid idling for too long when warming up the car to reduce water accumulation. If abnormal noise is detected, pull over and check basic components. Ensure a stable driving environment to prevent small issues from turning into major hazards.
Was this review help?
2
4
Share
Expand All
More Forum Discussions

Where is the central point for left turns in Subject 3?

The central point for left turns in Subject 3 is marked with corresponding signs on the road. Not turning left near the central point of the intersection means that when a motor vehicle makes a left turn at an intersection controlled by traffic signals without turning near the left side of the central point, it constitutes a traffic violation, violating Article 51 of the "Regulations for the Implementation of the Road Traffic Safety Law of the People's Republic of China". Below is an introduction to Subject 3: 1. Definition of Subject 3: Subject 3 includes the road driving skills test and the safe and civilized driving knowledge test, which are part of the motor vehicle driver's license assessment. It is the abbreviation for the road driving skills and safe and civilized driving knowledge test in the motor vehicle driver's examination. The content of the road driving skills test varies for different types of vehicles. 2. Test content of Subject 3: (1) The road driving skills test generally includes: preparation before driving, simulated light test, starting, driving straight, gear shifting operations, changing lanes, parking by the roadside, going straight through intersections, left turns at intersections, right turns at intersections, crossing pedestrian crossings, passing school zones, passing bus stops, meeting vehicles, overtaking, making U-turns, and driving at night. (2) The safe and civilized driving knowledge test generally includes: requirements for safe and civilized driving operations, safe driving knowledge under adverse weather and complex road conditions, emergency handling methods for situations like tire blowouts, and knowledge of post-accident handling procedures.
10
5
Share

What are the dimensions of the Clever?

Its length is 3140mm, width is 1648mm, height is 1521mm (1531mm with shark fin antenna), and the wheelbase is only 2000mm, which is significantly smaller than the already discontinued Roewe E50. The Roewe Clever features a compact body with large headlights, and its side design is quite simple. The Clever's body dimensions are small, positioning it as a microcar. Additional info: The Clever's wheels use basic black steel rims paired with 175/60R13 Cheng Shin CS868 series tires, which enhance the strength of the tread, shoulder, and sidewall.
6
4
Share

How to Reset the Engine Malfunction Light?

The methods to reset the engine malfunction light are: 1. Visit a 4S shop or auto repair shop to use a fault code reader for troubleshooting; 2. Disconnect the negative terminal of the battery to clear the fault codes. The reasons for the engine malfunction light illuminating include: 1. Poor gasoline quality leading to incomplete combustion of the air-fuel mixture in the cylinders, resulting in carbon deposits; 2. Excessive mileage causing weakened spark plug performance; 3. Aging vehicle components; 4. Damaged, poorly connected, or interrupted signals from sensors such as coolant temperature, crankshaft position, air flow, intake temperature, and oxygen sensors. Solutions for the engine malfunction light include: 1. Promptly inspect the engine's condition; 2. Check the status of sensors, air flow sensors, and spark plugs; 3. Check for engine knocking; 4. Inspect the ignition coils for faults; 5. Clean carbon deposits from the engine.
3
2
Share

Why are used Roewe RX5 so cheap?

Roewe RX5 used cars are inexpensive for the following reasons: Resale value: The main reason is that Roewe RX5 has a low resale value, so when sold as a used car, the price is relatively low. Factors contributing to the low resale value include the small market share of the vehicle and relatively high maintenance costs. Before reaching scrap standards: If a car has not yet reached the national scrap standards or can still be used during its economic lifespan, it can be traded as a used car. Choosing to buy a used car is also a wise decision. With the continuous development of the automotive industry, the performance of cars is constantly improving, and vehicle emissions can be gradually reduced. By implementing vehicle emission standards, atmospheric pollutants emitted by cars can be directly reduced at the source.
10
0
Share

What voice command to open in Nissan cars?

Nissan's latest smartphone integration system supports Apple iOS CarPlay functionality. After connecting via a data cable, you can use the steering wheel buttons to activate the voice command Siri for hands-free calling and quick navigation planning. It also supports most mainstream Android smartphones on the market, enabling connection via Wi-Fi + Bluetooth. Stay connected to information both inside and outside the vehicle without holding your phone. Here's the relevant introduction: Function of in-car voice assistant: During daily driving, it's inevitable to perform some simple operations such as turning on the air conditioning or activating navigation. With the rapid development of in-car voice assistants, these simple operations can now be handled by the voice assistant, significantly reducing distraction time while driving and improving driving safety.
11
3
Share

What are the reasons for the Highlander's Bluetooth connection failure?

Highlander's Bluetooth connection failure may be caused by the following reasons: Mobile device issues: It is recommended to clear the information of the paired device, then click to scan for devices, locate the device to be connected, and proceed with the connection. There will be a verification process during this time; simply follow the prompts. Issues with the Bluetooth device being connected by the phone: For Bluetooth devices such as headphones, it is advised to check if the battery is sufficient and restart the device before trying again. If it still doesn't work, you can perform a factory reset. The method to reset varies by device, so refer to the manual or consult customer service. Location issues: There may be interference from other Bluetooth devices nearby. It is recommended to try connecting in a different location.
8
4
Share
Cookie
Cookie Settings
© 2025 Servanan International Pte. Ltd.