What Causes Engine Shaking When Parking?
2 Answers
Parking shaking may be caused by aging engine components, and car shaking is also related to aging engine mounts. Here is relevant information: 1. Excessive carbon deposits: If there is severe carbon buildup in the engine cylinders, it can lead to clogged spark plugs and valves, directly causing the car to shake during idling. If the car's acceleration performance has significantly declined and the shaking persists, consider cleaning the engine cylinders. 2. Fuel supply system malfunction: Unstable fuel pressure can easily cause inconsistent concentration of the air-fuel mixture, resulting not only in shaking but also unstable idling. First, consider replacing the fuel filter, as prolonged use may clog the filter element. Then check the fuel pressure bypassing the fuel filter; if abnormal, it could indicate a fuel pump issue. 3. Misfiring cylinders: This is one of the most common causes of engine shaking, if not the most common. The problem lies in the engine ignition coil or spark plugs. If the ignition coil malfunctions or the spark plugs fail to fire for some reason, the car will exhibit shaking.
I've encountered the issue of engine shaking when idling several times. As someone who drives frequently, I think it's mostly due to problems with the ignition system, such as worn-out spark plugs or faulty ignition coils. If the spark plug gap is too large, it can cause unstable ignition, leading to the engine shaking when idling. Additionally, excessive carbon buildup is a common cause—those sludge deposits clogging the intake manifold can result in uneven air-fuel mixture, causing shaking. Another possibility is a dirty idle control valve, which fails to regulate the RPM properly, especially noticeable when idling. I once had a case where a vacuum hose leak caused it—just a tiny crack made the engine run unevenly. My suggestion is to first check the spark plugs and try replacing them. If that doesn't work, clean the throttle body or inspect the sensors. Don't ignore it, as prolonged shaking can damage the engine.
