Is it normal for a turbocharged engine to shake when it starts cold? Why didn't my car shake when it started cold before?

Many car owners often encounter this problem when driving in winter: when the car is cold, the engine shakes violently. Is this normal? What causes the car to shake? Why did the old car not shake before, but the new car shakes more violently?

Is it normal for a turbocharged engine to vibrate during cold start?

It is normal to have a short-term vibration during a cold start! It depends on whether the turbocharged engine is a diesel engine, gasoline, or natural gas. The vibration problems of turbocharged engines with different fuels are also different. The following is an analysis of the vibration causes of turbocharged engines with diesel fuel as fuel. Please correct me if there are any inappropriate points. 1. If the vibration is rhythmic and not too serious, it is mostly because the idle throttle is adjusted to a relatively small level, so that some fuel can be saved during operation. 2. If the vibration is serious, the governor, electronic control module, etc. may be at fault.

Why didn't the car shake when it was cold started?

With the improvement of environmental protection requirements in the world, every country is vigorously controlling automobile emissions. China's automobile industry has also upgraded the emission standards for automobile engines from the original National IV standard to the National V standard, and is currently moving towards the National VI standard... The requirements will become higher and higher in the future, and the country's control over automobile emissions and fuel consumption will become increasingly strict.

However, due to the technology and bottlenecks of the engine itself, it is difficult to improve the engine structure and materials to reduce engine exhaust emissions and improve engine combustion efficiency. The cost is too high and the cycle is too long! In order to improve the exhaust emissions of the car, the comfort and stability of the engine during cold start have to be sacrificed.

Will a clogged fuel injector cause the car to shake?

Injector nozzle blockage is also a common problem. Under high engine temperature, the injector nozzle is easily attached by colloid in gasoline, and the spray hole is also affected by carbon deposits, which leads to problems with engine fuel supply and jitter. This is especially obvious in a cold engine, because gasoline is not easy to volatilize in a cold engine. At this time, if the atomization effect of the injector nozzle is not good, the engine is prone to jitter.