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 Does Unstable Idle Mean?

1 Answers

LaJonathan

07/29/25 10:19am

Unstable idle refers to the phenomenon where the engine's tachometer fluctuates up and down while idling, accompanied by engine shaking. The causes of unstable idle and shaking in a car include: 1. Severe engine carbon buildup; 2. Dirty throttle body or carbon deposits in the fuel injectors; 3. Faulty spark plugs, high-voltage wires, or ignition coils leading to poor ignition system performance; 4. Unstable fuel pressure, insufficient fuel pump supply pressure, or incorrect readings from the intake pressure sensor; 5. Clogged fuel lines causing insufficient fuel supply; 6. Aging engine components. Extended content: Solutions for unstable idle and shaking: Clean carbon buildup from the engine and idle control valve; Clean the fuel system; Replace spark plugs, high-voltage wires, and ignition coils; Clean the air filter and throttle body.

Was this review help?

17

3

Share

More Forum Discussions

What is the problem with the abnormal noise from the car chassis?

It may be an issue with the suspension system. Here is a relevant introduction about the chassis: 1. Introduction: The chassis refers to the combination of the transmission system, running system, steering system, and braking system on a car. It supports and installs the car engine and its various components and assemblies, forming the overall shape of the car, bearing the engine power, and ensuring normal driving. 2. Function: The role of the chassis is to support and install the car engine and its various components and assemblies, forming the overall shape of the car, and receiving the engine's power to make the car move and ensure normal driving. At the same time, a good chassis can ensure the driver's life safety.

Does the 2021 Levin have only one reverse light?

2021 Levin has 2 reverse lights distributed on both left and right sides. Reverse light position: The reverse lights are installed at the rear of the vehicle. They are generally integrated into the rear taillight assembly or transparent glass. The Levin can use LED automotive reverse lights, meaning the material used is LED. LED reverse lights feature pollution-free, radiation-free, and long service life characteristics, with a theoretical lifespan of over 50,000 hours. Function of reverse lights: The Levin has two reverse lights for illuminating the road behind the vehicle, which can be used to warn vehicles and pedestrians behind that the car is reversing. All reverse lights are white.

Is the Anti-lock Braking System Activated When the ABS Light Is On?

When the ABS light is on, the anti-lock braking system is not activated. Instead, it is in a faulty or even deactivated state. Overview of Automotive ABS: The Anti-lock Braking System, abbreviated as ABS, functions by automatically controlling the braking force during vehicle braking to prevent wheel lock-up. This ensures the wheels maintain a rolling and sliding state (with a slip ratio of around 20%), maximizing the adhesion between the wheels and the road surface. Classification of Automotive ABS: In ABS systems, the brake pipelines capable of independently adjusting braking pressure are referred to as control channels. ABS devices are categorized into four-channel, three-channel, two-channel, and single-channel types based on their control channels.

Does stepping hard on the accelerator when starting hurt the car?

Stepping hard on the accelerator when starting can hurt the car for the following reasons: 1. Component damage: When the car is just started, after being parked for a period of time, the engine oil settles at the bottom of the oil pan and hasn't yet started lubricating. Stepping hard on the accelerator at this moment can cause wear and tear on mechanical parts. 2. Clutch damage: The moment the engine flywheel speed increases, the transmission system is still moving at the original speed. The speed difference causes the torque transmitted by the clutch to increase instantly, leading to slippage of the clutch friction plates. The resulting sliding friction generates heat, which over time can likely cause damage to the clutch.

What is the fuel consumption of the Elantra?

Elantra 1.5L displacement has a real fuel consumption of about 7.3L per 100 kilometers. Factors affecting fuel consumption: Driver's driving habits, road conditions, the weight of items placed in the car, whether the air conditioning is on, and whether the vehicle is in the break-in period, etc., will all affect the vehicle's fuel consumption. Ways to reduce fuel consumption: Start in low gear, gently press the accelerator, and gradually increase speed; avoid long-term idling or low-speed driving; avoid excessive vehicle load and a full fuel tank; avoid using high-viscosity engine oil; try to control speed with the accelerator rather than the brake.

What does 929598 mean in cars?

929598 in cars refers to 92-grade engine oil, 95-grade engine oil, and 98-grade engine oil, which are abbreviations for these three types of engine oils. Overview of car engine oil: Engine oil, also known as engine lubricant (English name: Engine-oil), serves functions such as lubrication and wear reduction, auxiliary cooling, sealing and leakage prevention, rust and corrosion protection, and shock absorption for the engine. Composition of car engine oil: Engine oil consists of two parts: base oil and additives. The base oil is the main component of lubricating oil, determining its fundamental properties. Additives can compensate for and improve the shortcomings of the base oil's performance, imparting new characteristics, making them an essential part of lubricating oil.

Trending Ranking

Do I Need to Replace a Tire That Was Punctured by a Nail but Isn't Losing Air?

What are the hazards of long-term outdoor parking for cars?

What procedures are required to cancel ETC?

How much does a car generally weigh?

Why is the car air conditioning pipe leaking water to the co-driver position?

What causes the 4lo light to flash and the engine light to come on simultaneously?

What should be the maximum temperature setting for a car air conditioner?

How Long is the Warranty for Brake Discs under the Three Guarantees?

What does EBS mean in automobiles?

Are Motorcycle Crash Bars Considered Illegal Modifications?

More Forum Discussions

Does the 2021 Tharu have ambient lighting?

What is the Function of Motorcycle Engine Oil?

Will the co-driver be penalized for holding a dog?

Why does the engine keep stalling and failing to start after replacing the diesel filter?

Help

Cookie

Cookie Settings

© 2025 Servanan International Pte. Ltd.