···
Log in / Register

What Are the Reasons Why a Car Cannot Reach High Speed?

3 Answers
MacZoey
07/30/25 12:56am
Car speed may not increase due to clutch and transmission malfunctions, and it should be taken to a 4S shop for inspection and repair as soon as possible. The following is an introduction to the car clutch and transmission: 1. Clutch: The clutch is part of the car's transmission system, and this component is very important for the car. The clutch is responsible for connecting or disconnecting the engine from the transmission, and it is installed between the engine and the transmission. The clutch pressure plate is fixed to the engine flywheel, with the clutch disc located between the pressure plate and the flywheel. 2. Transmission: The main functions of the transmission for a car include changing the car's gear ratio, enabling reverse driving, and interrupting power transmission.
Was this review help?
1
3
Share
BryceLynn
08/15/25 6:23am
I found that the car's speed can't go up, often due to issues with the engine's ignition system, such as aging and worn spark plugs causing insufficient ignition energy, or cracked ignition coils leaking electricity and affecting arc generation, leading to incomplete fuel combustion and naturally weak power. There's also the issue of cylinder compression, where poor valve sealing or worn piston rings leaking compression pressure reduce engine output. I remember once after a long drive, the acceleration was weak, and using an OBD diagnostic tool, I found the timing belt was loose and there was abnormal combustion. It's recommended to regularly check spark plugs and compression ratio, replace parts if necessary, and use high-quality engine oil for maintenance to avoid high-temperature engine load. This way, speed can steadily improve, and the car's lifespan can be significantly extended.
Was this review help?
20
3
Share
Expand All
StIris
10/20/25 4:13am
When it comes to the issue of not being able to increase speed, I've found that the fuel system is often the culprit. For example, using low-quality gasoline with excessive impurities can clog the fuel injectors, or insufficient fuel pump pressure may lead to poor fuel delivery. A long-unreplaced fuel filter accumulating dirt can starve the engine of power. From my experience driving various vehicles, severe carbon buildup in the fuel injectors makes acceleration feel like an old ox pulling a cart - timely cleaning or using fuel additives to remove carbon deposits can significantly improve performance. Keeping the fuel lines clear is also crucial; don't wait until the fuel pump burns out to make repairs. Develop the habit of checking every three months and choose reliable fuel brands. With proper maintenance, your speed will naturally remain smooth and reliable.
Was this review help?
8
5
Share
Expand All
More Forum Discussions

What is the difference between low-end torque and high-end torque?

The difference between low-end torque and high-end torque lies in the fact that the maximum power occurs at different RPM ranges. Below is a detailed introduction to the differences between the two: 1. Power aspect: The power is relatively small, and as the RPM increases, the power gradually amplifies. With further RPM increase, the power will slowly decline. A car with high torque at low RPM means it can output relatively high torque at lower RPMs, while a car with low torque at high RPM means it outputs relatively low torque at higher RPMs. 2. Engine internal structure aspect: Gasoline engines belong to the high RPM category, whereas diesel engines belong to the low RPM category.
6
3
Share

What transmission does the Changan Oshan X7 use?

Changan Oshan X7 uses a 7-speed wet dual-clutch transmission. More information about Changan Oshan X7 is as follows: 1. Changan Oshan X7 is equipped with a Blue Whale series 1.5TGDI engine, with a maximum power of 131kW (178PS)/5500rpm and a peak torque of 265N·m/1450-4500rpm. 2. The new car comes standard with shark fin antenna, full LED low/high beam headlights, adjustable LED headlight height, LED mirror turn signals, LED brake taillights, LED rear fog lights, delayed headlight shutdown, vehicle search light/sound prompts, electric mirror adjustment, and anti-glare interior rearview mirror.
10
1
Share

How to Use the 8th Generation Camry's Manual-Automatic Transmission?

8th Generation Camry's manual-automatic transmission is specifically used by switching from P gear to D gear, and then from D gear to the left M gear. Pushing up shifts to a higher gear, while pushing down shifts to a lower gear. Below is more information about the manual-automatic transmission: 1. The manual-automatic transmission is also a type of automatic transmission, but it adds the function of manual shifting. 2. The driver controls the shifting timing based on the engine speed and actual road conditions. 3. In manual mode, when the vehicle brakes or decelerates, the transmission will automatically downshift, and the driver does not need to manually downshift unless encountering situations that require forced downshifting, such as accelerating to overtake.
6
4
Share

What Causes Doors to Automatically Lock?

The reason doors automatically lock is that when the vehicle speed reaches the preset value in the computer, the door lock button will be automatically pressed. This feature, also known as speed-sensing auto-locking, is designed to prevent accidental door opening. There are other methods of automatic door locking as well. For instance, when the transmission is shifted into D (Drive) gear, the lock button will automatically engage to prevent unintended door opening. Some Chevrolet and Buick models use this locking method. Another method involves the doors automatically locking when the driver applies the brakes during driving, commonly found in domestic or some low-end vehicles. A less common locking method is when the doors automatically lock after the vehicle has been in continuous motion for 10 seconds.
13
0
Share

What Causes the Exhaust Pipe to Turn Red?

Exhaust pipes turning red occur when part of the combustible gas from the cylinders enters the exhaust pipe and continues to burn. The specific reasons are as follows: Combustible gases rushing into the exhaust pipe: This leads to the exhaust gases entering the exhaust pipe, raising the exhaust temperature. If the fuel injection timing is too late, it not only slows down the combustion rate but also results in incomplete combustion, causing diesel to burn in the exhaust pipe during the later stages of injection, thereby increasing the exhaust temperature. Part of the combustible gas from the cylinders enters the exhaust pipe: An overly lean air-fuel mixture can cause slow combustion after ignition, extending into the exhaust stroke and continuing to burn. Exhaust valve leakage or insufficient valve clearance: If the exhaust valve does not seal properly or the valve clearance is too small, it allows combustion gases to enter the exhaust pipe, raising the exhaust pipe temperature.
15
3
Share

Should the Hyundai Fista use 92 or 95 octane fuel?

The minimum fuel grade specified for the Fista's engine is 92 octane, so this engine can use 92 octane or higher fuel. Here is some relevant information about gasoline: 1. 92 octane gasoline consists of 92% isooctane and 8% n-heptane, while 95 octane gasoline consists of 95% isooctane and 5% n-heptane. The higher the octane number, the better the fuel's anti-knock performance. 2. The anti-knock performance of gasoline refers to its ability to resist knocking during combustion in the engine. Engine knocking is often mentioned, which is essentially an abnormal combustion phenomenon of gasoline. 3. If the engine uses fuel that does not meet the specified grade, knocking may occur during operation. This can also lead to reduced vehicle power, increased engine noise, and higher fuel consumption.
11
4
Share
Cookie
Cookie Settings
© 2025 Servanan International Pte. Ltd.