09 Jetta moves up and down at an idle speed of 700 ~ 800 rpm. What happened?

This is a normal phenomenon. After cleaning the throttle, the idle speed will increase, and some models will reach 2000 rpm, which requires computer cooperation. If it is higher than 100 rpm, it will be normal to run for a day or two, because the car computer will learn by itself, and it needs to be slowly adjusted to the best state after washing. This is not a problem. Don't worry, you'll be fine.

Jetta is the automobile brand of FAW-Volkswagen Co., Ltd., a joint venture of Audi AG in China. Its first product, Jetta -MK 1, was launched in Europe on 1979. As far as its structure is concerned, Jetta (including later Wentuo/Bora) is a golf with a trunk, and Jetta is also a derivative of golf.

19911On February 5th, the first domestic Jetta A2 was assembled at FAW-Volkswagen Automobile Factory, which was an improved version of Volkswagen's second German Jetta A2 based on 1983. Since then, in the past 26 years, Jetta has continuously broken through itself in the China market. By the end of 20 16, its sales volume exceeded 3.6 million units, and it has the reputation of "highway boutique", "magic car" and "the first brand of family cars in China".