Passat sedan put into operation in 1999, in Shanghai Volkswagen off the assembly line has been almost 9 years. In 2005, Shanghai Volkswagen launched a new model based on Passat B5 PASSAT Yu Yu, because the model completely for the Chinese market and road conditions, the industry is known as the Passat B5.5. At present, Shanghai Volkswagen has been selling Passat and PASSAT total surrendered has more than 1 million, in the domestic high-class car market enjoys a high reputation.
    First, the engine failure
    1. The engine is not easy to start, there are "sudden" sound
    For the installation of 5-valve engine, three intake valve structure to improve the engine's intake efficiency is also easier to produce carbon deposition in the intake valve. Generally 5 to 80,000 km engine will not be easy to start, after the start of the "sudden" sound, or even turn off, this situation is caused by coke. Because coke is mostly loose porous material, can absorb a lot of gasoline. If the coke is too much, when the engine starts at low temperature, coke will adsorb gasoline, so that the engine can not form a thick mixed gas, resulting in easy to start. After the start of the heating in the coke will also add gasoline to make the mixture too thin, the engine cylinder caused by poor engine jitter, exhaust emissions exceeded. In addition, the mixed steam is too thin, the mixing steam burning time becomes longer, causing the exhaust valve to open when the gas pressure is too high, the exhaust noise will become larger, the engine will have "sudden" sound, according to the number of coke will continue for 1 ~ 3min The Coke can be handled with a removable device, or it can be removed and mechanically cleaned. Maintenance personnel in the maintenance found that as long as the usual attention to the following points, you can reduce the carbon deposition: ① keep the air cleaner clean; ② gasoline to add gasoline cleaner; ③ often replace the gasoline filter; ④ high-speed engine, , Is conducive to the valve self-cleaning.