What causes the shaking during cold start of a new Polo?
3 Answers
Cold start shaking may be caused by excessive carbon deposits or unstable fuel pressure in the fuel supply system, which can lead to unstable mixture concentration resulting in vibration. Here are relevant explanations: 1. Precautions: If the vehicle has been parked for a long time before cold start, the fuel lines may become vacuum with no fuel, and prolonged parking can cause gasoline oxidation and oil-water separation, leading to shaking. 2. Throttle troubleshooting: If the vehicle shakes severely at idle, try gently pressing the accelerator. If the shaking disappears after pressing the accelerator, it's likely that the throttle is dirty and needs cleaning.
I have experience with the issue of new Polo cars shaking during cold starts. There are several common causes. Problems with the ignition system, such as excessive spark plug gap or electrode carbon buildup, can occur even in new cars if the factory adjustments were not precise. Another major factor is clogged fuel injectors, which can lead to inaccurate fuel injection control during cold starts, causing engine vibration. Loose engine mounts or insufficient oil pressure can also be to blame, as low oil temperature results in inadequate lubrication. It's normal for new cars to have slight shaking during the break-in period of a few weeks, but if it persists, consider changing the engine oil and checking its quality. I recommend observing the issue over several starts first. If the shaking happens frequently, take the car to a 4S shop to scan for trouble codes with a diagnostic tool—avoid DIY fixes that might damage delicate components. It's best to address this under warranty. Also, avoid using low-quality gasoline, as it can worsen the problem.
As a new Polo owner, I recently experienced severe shaking during cold starts. At first, I thought it was due to cold weather making the engine tight, but after checking at the service center, they said it might be a slightly clogged fuel filter or high oil viscosity. For new cars, it's best to use the specified 5W-30 or similar grade oil and avoid randomly choosing other brands. A friend's car had unstable air-fuel mixture due to false sensor readings. I always wait for a minute after starting before driving, and it gets much better after warming up. If the shaking is accompanied by noise or the engine light flashes, get it checked as soon as possible. The new car maintenance manual has tips on break-in precautions, which are recommended to follow to avoid damage.
