Why Does a Car Shake at Low RPM?
2 Answers
Car shaking at low RPM can be attributed to the following reasons: 1. Dynamic Imbalance: A car's wheel is an assembly consisting of a tire and a rim. However, due to manufacturing variances, the mass distribution of this assembly may not be perfectly uniform. When the wheel rotates at high speeds, it can lead to dynamic imbalance, resulting in wheel shaking and steering wheel vibration during driving. 2. Hydraulic Power Unit Failing to Achieve Balance During Operation: The slow oil discharge rate (small discharge volume) from the large chamber of the cylinder causes the single-rod double-acting piston cylinder to move slower when the small chamber is supplied with oil compared to when the large chamber is supplied.
I often encounter friends' cars shaking like a sieve at low RPM, which is mostly related to the ignition system. For example, aging spark plugs can cause poor ignition, and clogged fuel injectors can lead to uneven fuel supply. Excessive engine carbon buildup can also cause trouble, making the engine lack power and shake at low speeds. Additionally, don't overlook loose suspension or failed engine mounts, as they can make the whole car vibrate. If this shaking isn't addressed promptly, not only will driving become uncomfortable, but fuel consumption will also skyrocket. Therefore, I recommend regularly checking these components. Replacing spark plugs is a simple fix that can save money and avoid major repairs.
