What Causes Engine Shaking During Cold Starts?

1 Answers
VonErin
07/25/25 4:12am
Engine shaking during cold starts can be caused by: 1. Excessive carbon buildup in the throttle body, fuel injectors, or intake passages; 2. When there's too much carbon deposit inside the engine, the gasoline sprayed by cold start injectors gets largely absorbed by the deposits, resulting in an over-lean air-fuel mixture that causes startup vibration; 3. Cylinder misfire due to mechanical failures in ignition coils, spark plugs, or fuel injectors; 4. Insufficient power caused by low fuel pressure or cylinder compression; 5. Substandard fuel quality; 6. Damaged or excessively dirty idle control valve; 7. Intake manifold air leaks; 8. Damaged engine mounts or cushion pads; 9. Oxidized or low-grade engine oil with poor low-temperature fluidity, leading to inadequate cold-start protection for the engine.
Was this review help?
18
3
Share
More Forum Discussions

What is a Silver-Eared Audi?

Silver-Eared Audi refers to the S/RS series performance models under the Audi brand. These models are named "Silver-Eared" because both exterior rearview mirrors of Audi S/RS performance models are decorated with silver chrome materials. The "RS" series represents the ultimate performance version of the corresponding regular Audi models, with performance far exceeding that of the "S" series. The "RS" series is exclusively designed, developed, and manufactured by quattro GmbH, a wholly-owned subsidiary of Audi, and is not produced according to the standards of regular Audi models. Audi is a renowned automobile developer and manufacturer, with its logo featuring four interlocking rings. Currently a subsidiary of Volkswagen Group, its headquarters is located in Ingolstadt, Germany. "RS" is actually the abbreviation of the German word "RennSport," which translates directly to "racing sport" in English. As the highest-performance products in the Audi family, the "RS" series models can be considered a showcase of Audi's top-tier technology. RS models are generally produced in limited quantities, such as the Audi RS3, RS4, RS5, RS6, RS7, etc. The "S" series includes models like the S1, S2, S3, S4, S5, S8, SQ5, S6, S7, etc. Key milestones in Audi's development are as follows: June 16, 1909 – Audi was founded in Zwickau. March 10, 1969 – Audi-NSU Auto Union GmbH was established. March 1977 – The last NSU R80 car left the production line, marking the completion of the NSU brand's mission after over a century. All cars produced in Neckarsulm thereafter carried the "Audi" brand. 1980 – The application of the quattro all-wheel-drive system, with the first batch of mass-produced all-wheel-drive cars causing a sensation. April 6, 2006 – The new Audi TT sports car was unveiled to the public for the first time. June 2021 – Audi announced that it would start launching pure electric vehicles from 2026.
18
4
Share

Will There Be Consequences If I Abandon My Impounded Vehicle?

Impact of abandoning an impounded vehicle, details are as follows: Handling methods for abandoning an impounded vehicle: There will be issues, it is recommended to actively handle related violations. Failure to address traffic violations on time will most directly result in late fees. Consequences of abandoning an impounded vehicle: Not handling an impounded vehicle will also lead to a ban on all driver's license services, meaning the license cannot be renewed, and after one year of expiration, the license will be revoked. Consequences of overdue traffic violations: Failure to address traffic violations on time will most directly result in late fees. Generally, late fees start accruing from the 16th day after the violation. The late fee is 3% of the fine per day, with a cap not exceeding the original fine amount. For example, for a 200-yuan fine, the late fee will not exceed 200 yuan. If you continue to accumulate violations without addressing the previous ones, once discovered by traffic police, you may face license suspension or even vehicle impoundment. Another crucial point is that if any accident or damage occurs to the vehicle while there are outstanding violations, the insurance company has grounds to refuse claims.
5
2
Share

What type of suspension does the MG 6 use?

The MG 6 uses the following suspension systems: the front suspension is a MacPherson strut independent suspension, and the rear suspension is a multi-link independent suspension. The use of a multi-link rear suspension improves tire contact with the ground, thereby enhancing both ride comfort and handling performance. Here is more information about these two types of suspension: 1. The MacPherson strut independent suspension is an important component of a car's safety structure. The vehicle's handling and ride comfort are closely related to the suspension system in the chassis structure, and the simplicity or complexity of the suspension design directly affects the manufacturing cost of the car. The MacPherson strut independent suspension is one of many suspension systems, widely used due to its simple structure, low cost, and decent comfort. Key advantages: The MacPherson suspension offers good responsiveness and handling, along with a simple structure, compact size, low cost, and lightweight, making it suitable for large engines and compact car bodies. 2. The multi-link independent suspension consists of links, shock absorbers, and suspension springs. It has more links than typical suspensions; conventionally, a suspension with 4 or more links is referred to as a multi-link suspension.
13
1
Share

Where is the fuel tank cap opening on the Volkswagen Bora?

The fuel tank cap of the Volkswagen Bora unlocks when all four doors are open (i.e., when the central locking system is activated). Simply press the rear side to open it. Below is more information about fuel tank caps: 1. A fuel tank cap refers to the container on a car used for storing gasoline. It is typically square-shaped, made of stainless steel, and has excellent sealing properties. It is usually located at the rear of the vehicle. 2. For household cars, the fuel tank cap can be opened in three ways: using a key, an internal switch, or direct pressing. 3. Mechanical Key Opening. This method is more complex, so it is rarely used in modern household cars. It is commonly found in rugged SUVs, such as the Jeep Wrangler or Haval H5. 4. Internal Switch Method. Nowadays, the more common method involves an internal switch button, which is more convenient than the mechanical key method. 5. Direct Press Method. Additionally, there is a direct press opening method, which is the most convenient of the three. It requires no action from the owner, allowing the fuel attendant to refuel directly.
3
4
Share

What do the A-pillar and B-pillar of a vehicle refer to?

Vehicle A-pillar and B-pillar refer to: 1. There are three pillars on both sides of the front windshield and front/rear door glass, which are the front pillar (A-pillar), middle pillar (B-pillar), and rear pillar (C-pillar) in order. They serve a supportive function; 2. The strength of the A, B, and C pillars is an important indicator of vehicle safety; 3. In the event of a rollover or overturn, the A, B, and C pillars can effectively prevent the cockpit from being crushed and deformed, providing protection for passengers inside the vehicle. Additional details: 1. The A-pillar of a vehicle is the pillar on either side of the front windshield, connecting the two front doors and the engine compartment. 2. The B-pillar of a vehicle is the pillar behind the driver's side where the seatbelt is anchored, also connecting the front and rear doors. 3. The C-pillar of a vehicle is the pillar at the rear that connects the roof to the rear end of the vehicle. 4. Some SUVs, MPVs, or extended sedans may have a D-pillar, which connects the rear end of the vehicle to the rear windshield.
20
1
Share

What to Do If ETC Card Is Stolen?

If your ETC card is stolen, report the loss immediately and bring your ID card, original vehicle license, and copies to the bank counter to handle the card replacement or reissuance procedures. The installation process for ETC devices is as follows: Upon receiving the device, first check if the ETC card and electronic tag (OBU) are damaged. Press the anti-tamper button on the back of the OBU. A red light will briefly turn on, and the OLED screen will display "Tag Invalid" or "Please Insert Card," indicating the device is functioning normally. Clean the front windshield to ensure the surface is smooth, clean, and dry. Then peel off the adhesive backing of the OBU and stick it to the installation position. Press firmly for 2-3 minutes to remove any air bubbles. Insert the ETC card with the front side facing the driver and the back side facing the windshield, ensuring the chip is inserted into the OBU device. ETC device activation method: Insert and remove the ETC card twice consecutively until the electronic tag screen displays "Bluetooth On." If "Tag Invalid" appears when inserting/removing twice without attaching the tag, this is normal and does not affect activation. Alternatively, press the button on top of the electronic tag to enable Bluetooth. Turn on your phone's Bluetooth and open the corresponding mobile app (usually a download QR code is on the electronic tag) to enter the device activation interface. Click "Device Connection" and wait patiently for the "Connection Successful" prompt. After successful connection, upload a photo of the vehicle's front to complete activation.
8
0
Share
Cookie
Cookie Settings
© 2025 Servanan International Pte. Ltd.