What is the problem with cold start shaking of the vehicle?

[Lance]

The reasons for cold start shaking of the vehicle are as follows: 1. Incomplete combustion of gasoline: The fundamental cause of shaking during cold start or idle in neutral is the incomplete combustion of gasoline in the cylinders. Poor combustion of gasoline leads to insufficient power output from the vehicle's engine, resulting in shaking. 2. Low engine temperature: Another issue caused by cold start is the low temperature of the engine, which results in low ignition energy and insufficient temperature inside the engine. This causes both fuel and lubricating oil to be at inadequate temperatures, requiring more fuel injection during cold start to meet power demands. Consequently, the gap between spark plugs increases, and the ignition energy decreases. Due to poor fuel atomization in low-temperature environments, higher ignition energy is needed for combustion. Over time, the ignition gap between spark plugs gradually widens, leading to a significant drop in ignition energy, ultimately affecting engine power and causing vehicle shaking. 3. Aging of wiring: Additionally, aging ignition coils, high-voltage wires of spark plugs, or leakage can also reduce ignition energy. Extended information: 1. Many modern engines use direct injection technology, which is prone to carbon buildup. Owners of direct injection engines are advised to clean carbon deposits every 20,000 kilometers. 2. Some auto repair shops use the "drip bottle" method to clean carbon deposits, which is ineffective. Owners are advised not to use this method. A better method for cleaning carbon deposits is the walnut shell blasting method. It is also important to avoid using low-quality gasoline, as this can cause shaking during cold start and exacerbate carbon buildup in the engine.

[RemingtonMarie]

The issue of engine shaking during cold starts is quite common, primarily due to several key components not cooperating properly under low temperatures. The ignition system is one of the root causes—for instance, aging or dirty spark plugs can lead to insufficient ignition energy, resulting in incomplete combustion in the cylinders. The fuel system can also be a culprit; clogged fuel injectors disrupt smooth fuel spray, affecting the quality of the air-fuel mixture. Additionally, excessive carbon buildup in the intake system restricts air supply during cold starts, making the engine feel like it's gasping for breath. Worn engine mount bushings further exacerbate the problem by failing to dampen vibrations effectively. If left unaddressed, these issues can lead to internal engine wear and reduced efficiency over time. From my observations, mechanic friends often emphasize that regular checks of these components can save a lot of trouble down the line.

[KaiRose]

I experienced severe shaking during cold starts, which really freaked me out, so I quickly looked into it. Turns out, the throttle body and intake pipe were heavily coated with dust, and in cold weather, fuel atomization was poor, leading to a lean air-fuel mixture and unstable ignition. Additionally, aging ignition coils, which aren't much of an issue in hot seasons, become problematic in winter. Clogged fuel injectors have a similar effect, causing poor fuel delivery at startup. Lastly, worn engine mounts reduce vibration damping. Ignoring these issues long-term makes the engine work harder and increases fuel consumption. I cleaned it once myself with good results, but for complex problems, it's best to visit a professional shop. Daily care includes using high-quality fuel and not letting problems escalate.

[VonPiper]

Cold start shaking poses significant risks. Engine instability increases wear and tear, shortening its lifespan. In severe cases, it may lead to breakdowns, especially dangerous during rainy days or on highways. The root causes include carbon buildup blockages, spark plug failures, etc. I've personally witnessed a friend getting into an accident due to this issue. Promptly replacing parts and repairing is the right approach. Don't delay repairs for the sake of convenience.