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What Causes Vehicle Shaking During Acceleration?

2 Answers

VonCorey

07/25/25 12:34am

Severe shaking during acceleration is primarily caused by excessive carbon buildup in the engine, throttle body, fuel injectors, and intake manifold leading to cylinder misfires; or insufficient power due to low oil pressure or cylinder compression. Below are engine maintenance recommendations:1. Maintain cleanliness: Keep oil, coolant, air, and engine components clean. Impure fuel can affect component coordination, while contaminated coolant may hinder engine cooling. 2. Ensure adequate supply: Maintain sufficient oil, coolant, and air levels. Proper engine maintenance ensures optimal performance. 3. Quality fuel: Use reliable fuel and prioritize fuel system maintenance, especially crucial for fuel-injected engines. Regular oil inspection, replenishment, and replacement are essential engine care methods. 4. Periodic cleaning: Regularly clean the engine radiator to remove rust and scale deposits. This constitutes effective engine maintenance. Additionally, periodic fuel system cleaning helps control carbon buildup and preserves engine condition.

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DiTanner

08/10/25 3:48pm

I've been driving for over a decade and encountered many instances of shaky starts. The main culprit is uneven wear on the clutch pressure plate, which causes jerky engagement and vibration. Excessive engine carbon buildup can also cause this, especially during cold starts. Worn spark plugs or faulty ignition coils can lead to misfires, resulting in unstable power at low RPMs. Another common issue is deteriorated engine mounts - those rubber components wear out over time, allowing engine vibrations to directly transmit into the cabin. The most overlooked cause is fuel system problems; insufficient fuel pump pressure or clogged injectors create unstable fuel delivery that manifests as shaking. I recommend checking these areas first.

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More Forum Discussions

What is the speed in second gear?

Second gear speed is generally around 20km/h. Here is some relevant information: Method: Second gear is a transitional gear for acceleration after starting or for low-speed forward movement. You can check the speedometer or listen to the sound. After starting, shift directly into second gear. When the engine speed reaches a certain level, it will produce a whining sound, which is quite loud. At this point, the speed does not increase significantly, and you can shift to the next gear. Mechanical transmission: It primarily utilizes the principle of gear reduction. Simply put, the transmission contains multiple sets of gear pairs with different transmission ratios. The act of shifting gears while driving involves using the control mechanism to engage different gear pairs in the transmission. For example, at low speeds, a gear pair with a larger transmission ratio is engaged, while at high speeds, a gear pair with a smaller transmission ratio is engaged.

Can You Start in Second Gear?

Starting in second gear is possible, but it will wear out the clutch plates of the car. Additionally, since the torque in second gear is smaller than in first gear, the engine must rotate faster to provide more power for starting in second gear. This process consumes more fuel and is prone to carbon buildup. Here are some driving precautions: Control the starting gear properly: The starting gear should always be first gear. Whenever the vehicle moves from a standstill to starting, the gear should remain in first. Shift gears sequentially: During road tests, avoid skipping gears. Gear changes should only be from first to second, second to third, and so on, in sequence. Otherwise, the test recorder will note this and deduct corresponding points. Shift gears quickly and steadily: The key to shifting gears is speed—complete the series of actions (depressing the clutch, shifting gears, and pressing the accelerator) as quickly as possible. When shifting gears, the clutch must be fully depressed, and gear changes should only occur within a certain speed range.

Do Used Car 4S Stores Still Offer Warranty?

If the vehicle is still within the warranty period, it can be covered by the warranty; otherwise, it cannot. A used car refers to a vehicle that has not yet reached the national standard for scrapping and has been registered with the public security traffic management authority, making it eligible for transaction and ownership transfer. The advantages of purchasing a used car are as follows: Cost-effective: Used cars are generally not the latest models on the market and are typically two years behind. Buying the same brand and model one or two years later can save money. Additionally, with rising fuel prices, the cost of commuting continues to increase. If finances are tight and the car is only needed for basic transportation, buying a used car is more economical. Low depreciation rate: Any car, once registered with the vehicle management office, depreciates in value each year. According to Fair Price used car evaluations, the higher the car's grade, the greater the depreciation rate.

At what speed should you downshift from second gear to first gear?

When downshifting from second gear to first gear, you should brake to reduce speed, decelerate to about 15 mph, immediately release the brake and press the clutch, then quickly shift from second gear to first gear, followed by rapidly lifting the clutch pedal to the semi-engaged state. Once the clutch is engaged, gently release the clutch pedal. Speed ranges for different gears: Start in first gear, shift to second gear when reaching 20 km/h; shift to third gear at 30 km/h; shift to fourth gear at 40 km/h; shift to fifth gear at 50 km/h, and use fifth gear for speeds above 50 km/h. Precautions for driving a manual transmission car: The correct way to press the clutch is to place the ball of your foot on the clutch pedal with your heel touching the ground. When the clutch is fully depressed, keep your knee slightly bent. Avoid using your toes to press the pedal or lifting your heel off the ground, as this may lead to insufficient force or slipping. Always depress the clutch fully to ensure complete disengagement and prevent wear. If you encounter difficulty shifting gears, release the clutch first, then press it again before attempting to shift. Never force the gearshift, as this can cause friction between the transmission gears. When driving downhill, never coast in neutral; always engage an appropriate gear to utilize engine braking and control the vehicle's speed.

What does it mean when a used car is not transferred?

Not transferring a used car means that after the vehicle transaction is completed between the two parties, the change of ownership procedures are not processed at the vehicle management office. However: For the buyer: Not transferring the ownership of a used car transaction may cause losses to the current vehicle owner. For the seller: Not transferring the ownership of a used car transaction may affect other vehicle management services. Relevant information about used cars is as follows: Used car: Refers to vehicles (including three-wheeled vehicles, low-speed trucks, originally agricultural vehicles), trailers, and motorcycles that have been registered with the public security traffic management authorities before reaching the national scrapping standards and can be traded with ownership transferred. Advantage: The biggest advantage of used cars is their affordable price. With the same amount of money used to buy a new car, you can purchase a used car of a higher grade.

Is It Safe to Use a Second-Hand Dismantled Engine?

It is not recommended to use a second-hand car with a repaired engine. Below is an extended introduction to general repair areas: Introduction to the Automotive Mechanical System: Generally includes a set of intake and exhaust valves, a set of piston rings, a set of 4 cylinder liners (for a 4-cylinder engine), two thrust washers, and 4 pistons. Introduction to the Automotive Cooling System: Generally includes the water pump (replace if the impeller is corroded or the water seal is leaking), upper and lower engine hoses, large circulation iron pipes, small circulation rubber hoses, throttle water hoses (replace if swollen due to aging), thermostat, etc. The fuel system generally includes upper and lower oil rings for the fuel injectors and the gasoline filter. Introduction to the Automotive Ignition System: Check the high-voltage lines for swelling or leakage and replace if necessary, spark plugs. The intake system generally includes the air filter. Other Auxiliary Materials: Generally includes antifreeze, engine oil, oil filter, carburetor cleaner, engine metal cleaner, or all-purpose cleaner.

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