What Causes Engine Shaking When Starting the Car?
2 Answers
There are four main reasons for engine shaking: a dirty air filter, low spark plug efficiency, abnormal water temperature, and clogged fuel injectors. Below is an introduction to engine shaking: 1. Dirty air filter: If the air filter is not replaced in time, it can cause insufficient air intake, leading to low idle speed and engine shaking. 2. Low spark plug efficiency: This affects ignition and is a common issue. Replacing all the spark plugs can resolve the problem. 3. Abnormal water temperature: High engine water temperature can cause early ignition timing, changes in the air-fuel mixture, thinning of engine oil viscosity, and reduced lubrication performance. Common causes include insufficient coolant, a stuck thermostat, a non-functioning fan, or inaccurate temperature control switch readings. These issues should be addressed. 4. Clogged fuel injectors: Blocked fuel injector nozzles can lead to inconsistent fuel injection among the injectors, causing uneven cylinder operation and engine shaking. The solution is to remove and clean the injectors.
I've encountered engine shaking during startup several times. The most common causes are aging spark plugs or excessive carbon buildup, especially noticeable during cold starts. Carbon deposits blocking the intake manifold or near the fuel injectors can cause uneven air intake, leading to shaking. Another possibility is loose or worn engine mounts, allowing the engine to wobble during startup. Fuel system issues shouldn't be overlooked either - clogged fuel lines or a weak fuel pump can cause insufficient fuel supply. My car was shaking badly before, but replacing the spark plugs completely solved it. I recommend checking these components every 20,000-30,000 km to prevent potential engine damage from worsening conditions.
