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 are the troubleshooting methods for unstable car idling?

2 Answers

Christine

07/24/25 6:53pm

There are several methods to troubleshoot unstable car idling: 1. Visual inspection under the engine hood: Observe the engine operation, the degree of vibration, and the swing amplitude of the engine tachometer needle to see if it deviates from the expected idle speed. Determine whether it is normal idle vibration or load idle vibration (such as when the air conditioning, lights are turned on, gear is engaged, or steering wheel is turned). Check for any abnormalities in external engine components, whether vacuum tubes are detached or damaged, if electrical connectors are loose, and if there are any leaks of oil, water, air, or electricity. Also, check if the exhaust pipe emits irregular sounds (indicating poor combustion), black smoke, or a raw gasoline smell, and ensure the throttle cable is properly adjusted. 2. Query and analyze fault codes: read codes – clear codes – run – read codes again: Refer to the fault code list in the repair manual to understand the causes, effects, and troubleshooting methods for each fault code. Do not ignore intermittent fault codes, as unstable idling often coincides with their occurrence. 3. Read and analyze data blocks: Data blocks provide real-time data during engine operation. Correctly analyzing data blocks reflects the technician's skill level. Analyze the reasons for any incorrect data.

Was this review help?

7

2

Share

SanCarson

08/11/25 10:32am

I've been driving for over 30 years. When encountering unstable idle speed, I'm used to first checking the throttle body to clean carbon deposits. The buildup can obstruct air intake, causing the RPM to fluctuate. I just spray it clean with throttle body cleaner myself. Worn spark plugs are another common issue - replacing them every 50,000 km prevents uneven ignition. A stuck idle control valve can also cause constant shaking, which can be fixed by removing, cleaning or replacing it. A clogged air filter affects air intake, which is easily solved by replacing the filter element. If the fuel quality is poor, try switching to higher-grade gasoline. Don't rush to the repair shop - these basic steps save time and effort. For prevention, regular cleaning every 30,000 km keeps the car running smoothly. Last time my old car had shaking issues, cleaning stabilized the idle speed, making driving more reassuring.

Was this review help?

12

3

Share

Expand All

More Forum Discussions

What is the fuel consumption of the Changan Oushang X7?

Changan Oushang X7's actual fuel consumption is not fixed, ranging from 8-12L per 100km, while the official combined fuel consumption per 100km is 7.4L. Additional information: 1. Powertrain: The Changan Oushang X7 is equipped with the Blue Core 1.5TGDI engine, which has been awarded the 'China Heart Top 10 Engine' title. This new 280T engine delivers a maximum power of 131Kw and a maximum torque of 265Nm, surpassing similar displacement engines from brands like BMW, Buick, and Honda. It reaches peak torque of 265Nm at just 1450rpm. 2. Performance: Thanks to the engine's strong scavenging technology, which utilizes the positive pressure difference between the intake and exhaust pipes to directly sweep fresh air from the cylinder into the exhaust system, it reduces residual exhaust gases in the cylinder, improves air charging efficiency, and enhances engine performance. The low-end torque of the engine is increased by over 20%, significantly improving starting performance. The optimized gear-shifting strategy enables engine down-speeding, leading to a notable reduction in fuel consumption.

Where is the handbrake on the Cadillac XT5?

Cadillac XT5's electronic parking brake button is located below the air vent on the left side of the steering wheel. Specific details are as follows: 1. Body dimensions: The Cadillac XT5 is a four-door, five-seat SUV with body dimensions of 4812mm in length, 1903mm in width, and 1680mm in height, with a wheelbase of 2857mm. The trunk capacity is 584 liters, and the second-row seats support a one-touch folding function, expanding the trunk space to a maximum of 1634 liters. 2. Design: The XT5 continues Cadillac's "Art and Science" design philosophy, featuring a short front overhang and long body design for a more spacious interior. It incorporates sporty dynamic lines and a steeply raked windshield. The XT5 has the lowest height-to-length ratio in its class at 0.35, offering improved aerodynamics and noise reduction under its sporty exterior, fully embodying the sleek and streamlined design trend of modern SUVs.

Is Lynk & Co a joint venture car?

Lynk & Co is a joint venture car, a new era premium brand jointly established by Geely Holding Group, Geely Auto Group, and Volvo Cars. It integrates European technology, European design, global manufacturing, and global sales, and is built on the CMA (Compact Modular Architecture) platform jointly developed by Volvo Cars and Geely Auto, with Volvo Cars taking the lead. Additional information: 1. Exterior design: The 'Wind Control Design' of the Lynk & Co 03 is a fusion of the 'Urban Contrast Aesthetics' family design concept and aerodynamic design, largely maintaining the Lynk & Co family design style. The front features a split-type headlight cluster, paired with a horizontal front grille and lower trim. On the side, the Lynk & Co 03 retains the traditional three-box sedan shape, with smooth C-pillar lines, while the rear adopts 'L'-shaped taillights and a black decorative panel integrating reflectors. 2. Interior design: The Lynk & Co 03 adheres to the family design philosophy, featuring a wraparound sporty cockpit, a driver-centric integrated smart center console, racetrack-inspired air vents, and a D-shaped sport steering wheel. The three-spoke steering wheel is equipped with multifunction buttons and paired with a digital instrument cluster. The gearshift area includes an electronic parking brake and a driving mode selection knob.

What are the main causes of severe wear in the middle of a tire?

The main cause of severe wear in the middle of a tire is excessive tire pressure. Below is a brief introduction to tire wear: 1. Abnormal wear in the middle of the tire: The primary reason for severe wear in the middle of the tire is that the current tire pressure is significantly higher than the standard pressure, which increases the rigidity of the tire and reduces its contact area with the ground, leading to excessive middle wear over time. Excessive tire pressure can also cause the tire to over-expand. As the tire temperature rises during driving, the pressure increases further, making the ride bumpier and increasing the risk of a blowout when encountering obstacles. 2. Abnormal wear on both sides of the tire: The reasons for abnormal wear on both sides of the tire are: low tire pressure or vehicle overload. When driving with low tire pressure, the entire weight of the vehicle presses on the side layers of the tire, leading to excessive wear on both sides and increased fuel consumption. 3. Abnormal wear on the inner or outer side of the tire: The main cause of abnormal wear on the inner side of the tire is related to the front wheel toe-in of the vehicle. Too much or too little toe-in can easily cause inner or outer side wear. Additionally, wheel camber has a significant impact on the wear of the inner and outer sides of the tire.

Why does the vehicle still show overdue after inspection?

It takes 1 to 3 working days to be displayed. After the vehicle undergoes annual inspection, there is a waiting period for the specific upload and archiving time. The status won't be updated immediately upon completion of the inspection, so there's no need to worry. If it hasn't been updated after 7 days, you can consult the vehicle management office. More extended information is as follows: 1. Annual inspection for non-operational small and micro vehicles: In the second and fourth years after vehicle registration, they are exempt from on-site inspection and only need to collect the annual inspection sticker. In the sixth, eighth, and tenth years, on-site inspection is required. Between the tenth and fifteenth years, annual on-site inspection is necessary. After 15 years, on-site inspection is required every six months. 2. Vehicles not undergoing annual inspection will be forcibly scrapped: If a motor vehicle fails to complete annual inspection procedures for three consecutive inspection cycles, it will be forcibly scrapped. The calculation isn't based on years; the three inspection cycles are six years, three years, and one and a half years respectively. It's crucial to pay attention to the motor vehicle's inspection cycle to avoid affecting normal vehicle use.

What Causes the Low Tire Pressure Warning Light to Illuminate?

The low tire pressure warning light illuminates due to abnormal tire pressure. If this light comes on while driving, remain calm and avoid panic. Immediately reduce your speed, refrain from sharp steering or sudden braking, and find a safe place to stop and inspect the tires. Both underinflation and overinflation can trigger the tire pressure warning light. When faced with this warning, the first step is to restore the tire pressure to its normal value before addressing how to turn off the tire pressure monitoring system (TPMS) warning light. There are generally three methods to reset the low tire pressure warning light: 1. Check and confirm if the tire pressure is normal: If there is an issue, adjust it to the standard pressure, then drive a few kilometers. Typically, the vehicle's computer will automatically reset the system. 2. Inspect the tire pressure sensor: If the tire pressure is confirmed normal, visit an auto service shop to have the tire pressure sensor checked and any fault codes cleared. 3. Manual reset: Locate the settings button on the central console (usually the SET key) to perform a manual reset.

Trending Ranking

How to Deal with Trunk Water Leakage?

What does the EV switch in the car mean?

What to Use to Wipe Off Sticky Substances on the Car?

What are the advantages and disadvantages of filling car tires with nitrogen?

Is a 12-Point Deduction Mandatory for Improperly Displayed Temporary License Plates?

How to Deal with Idle Vibration When Turning on the AC in an Accord?

Why does the motorcycle stall when shifting gears but can start in neutral?

Is it still necessary to affix the vehicle inspection sticker on the windshield?

Can the car start if the door is not properly closed?

What Causes Coolant to Boil?

More Forum Discussions

Does the 9th Generation Accord Have Bluetooth?

Where is the frame number of Jiangling pickup truck?

How to Deal with Foggy Car Windows When Driving in Rainy Autumn?

How to turn on the high beam of Borgward BX5?

Help

Cookie

Cookie Settings

© 2025 Servanan International Pte. Ltd.