Jetta starts in the morning and the valve rings.

Hello: regarding your inquiry, when will the cold car start?

blowhole

noise

Focus on checking

motor oil

liquid level

Too low or too dirty oil level will lead to excessive valve noise. It is normal to make a lot of noise only within half a minute after startup; Shake the cold car when it starts. Check the electronic equipment.

Throttle body

about

carbon build-up

Generally speaking, the vibration is caused by too much carbon deposition in the throttle body, and then check it.

combustion system

Working conditions of all components; There will also be flameout and carbon deposition when the cold car is started.

material

You can clean it up first.

carbon build-up

After debugging and observation, if there is no improvement after cleaning up the carbon deposit, the key point is to check it.

Electric fuel pump

, it is also possible.

gasoline feed pump

Performance degradation leads to flameout after starting.