What Causes Engine Shaking While Driving?

[Lima]

The reasons for engine shaking while driving are as follows: 1. Dirty air filter: The air filter is designed to protect the engine and reduce wear. It is generally replaced every 10,000 kilometers. If not replaced in time, insufficient air intake can cause low idle speed, leading to engine shaking. Simply replacing the filter can solve the problem. 2. Shortened spark plug lifespan: After 30,000-40,000 kilometers, the ignition efficiency of spark plugs significantly decreases, which can affect ignition. This is the most common issue, and replacing all spark plugs can resolve it. 3. Low idle speed: The engine idle speed is preset in the computer. When 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. 4. Abnormal water temperature: The engine operating temperature has a normal 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. 5. Clogged fuel injectors: The fuel injectors in fuel-injected cars are key components for fuel injection and have a long lifespan, reaching hundreds of thousands of kilometers. However, gum deposits in gasoline can clog the injector nozzles, causing inconsistent fuel injection among the injectors, leading to uneven cylinder operation and engine shaking. The solution is to remove and clean them. 6. Carbon deposits and oil sludge clogging: Over time, carbon deposits and oil sludge can clog the throttle body, idle valve, and intake ports, causing poor air intake, which affects idle stability and leads to shaking. Inspecting and cleaning these parts with a cleaning agent can solve the problem without the need for removal.