What are the reasons for car shaking during driving?
4 Answers
There are several reasons why a car may shake during driving: 1. Ignition system issues: Problems such as excessively large or small spark plug gaps, excessive carbon buildup on spark plugs, damaged ignition coils, loose or leaking high-voltage wires, etc. If the idle is unstable, the entire ignition system should be checked. 2. Excessive carbon buildup: Excessive carbon deposits on the engine, throttle, and fuel injectors are the most common cause of engine shaking. Since carbon absorbs gasoline, excessive carbon can be drawn into the cylinders for combustion, leading to fluctuating concentrations of the air-fuel mixture in the cylinders, which is especially noticeable during cold starts. 3. Abnormal water temperature: The engine operates within a specific temperature range. If the water temperature is too high, it can cause early ignition timing, changes in the air-fuel mixture, thinning of engine oil viscosity, and reduced lubrication performance. Common causes of shaking due to high water temperature include insufficient coolant, a stuck thermostat, a non-functioning fan, or an inaccurate temperature control switch. These issues should be addressed to resolve the shaking. 4. Low cylinder pressure: Engines have 3, 4, 5, 6, or 8 cylinders. If one cylinder is not functioning properly, it can lead to engine shaking due to misfiring. Use a cylinder pressure gauge to check the cylinder pressure. Xinba can be used to address low-pressure issues. Xinba is particularly effective for low and unbalanced cylinder pressure and can be added to the engine oil or directly into the cylinders to restore balanced pressure. 5. Low idle speed: The engine idle speed is preset in the car's computer. If the RPM drops below a certain range, the car's computer will automatically adjust it. If the idle speed is too low and causes shaking, it indicates that it is beyond the computer's control range. Check the idle control valve, throttle, air flow meter, vacuum sensor, and adjust the ignition timing to increase the idle speed.
I think the issue of car shaking while driving is quite common, possibly caused by unbalanced tires, where the wheels rotate unevenly at high speeds, creating a vibration-like sensation. It could also be a problem with the suspension system, such as a faulty shock absorber, causing the car body to bounce up and down. Engine ignition failure is another reason; worn-out spark plugs or carbon buildup can lead to unstable power output and shaking. Additionally, a bent or unbalanced driveshaft might be the culprit, especially noticeable during rapid acceleration. The braking system, like warped brake discs, can also cause shaking. I recommend checking the tires first if you notice this issue—balancing usually costs just a few tens of dollars—and then visiting a repair shop for diagnosis. Safety is more important than saving money.
My car used to shake before, and it was really uncomfortable to drive. It was okay on city roads, but once I hit the highway, it wobbled like a boat. I thought it was a minor issue and endured it for a few weeks, but then the fuel consumption increased. Later, I took it to a repair shop, and the mechanic said the tire balance was off. After rebalancing, the problem was solved. I also learned that if it were a suspension issue or a problem with the driveshaft, the shaking would be even worse. Personally, I think it's best not to ignore such issues—get it checked and fixed early. In my case, it only cost a hundred bucks to fix, avoiding bigger troubles down the road.
The issue of car shaking, I understand, is primarily due to dynamic imbalance. Unbalanced wheels can cause uneven rotation, leading to vehicle vibration. Suspension faults, such as failed shock absorbers, can also cause the body to bounce. On the engine side, ignition system problems like faulty spark plugs can transmit engine shaking to the body. A bent or unbalanced driveshaft can exacerbate vibrations at high speeds. The recommended inspection steps start with tire balancing, followed by a gradual check of the suspension and engine components.
