买车买完了一年多了， 起初刚买的时候没什么大问题，只是后来开了久了发现，当我push要提速的时候（上坡的时候），久而久之发现有点不对劲，仪表盘显示迅速加到3000-4000转然后在换挡。。。而且发动机轰鸣声听得心疼，我在国内的时候完全没碰过这种问题啊，后来一直以为是3滤的问题，正好要做大保养，就去做了一次大保，可是问题还没解决，真不知问题出在哪里了，开的没有任何问题，就因为轰鸣声大。。。求解啊

3000转之后换档了没有？换了就是正常现象。我都是踩到三千以上，除了略费点油，没什么坏处。

你换了哪三滤？大保具体都有哪些项目？车型？年份？里程？发动机灯亮了没有？

机滤、汽滤、空气滤清器。3000转后是换挡了。可自动挡的车不是一般2000多就换挡了么，这算发动机滞后么？

不同的自动档会在不同的转速换挡，上坡时候需要转速高了之后才能换挡，否则换到更高的档位，却扭力不够。
至于声音的话，排气系统也是要考虑的可能性。

[quote name='小鹏']3000转之后换档了没有？换了就是正常现象。我都是踩到三千以上，除了略费点油，没什么坏处。

你换了哪三滤？大保具体都有哪些项目？车型？年份？里程？发动机灯亮了没有？[/quote]

主要声音大，就像以前开的手排挡的车不换档就加油门，搞得我像超负荷运转了，到时候拉缸了。。。车是c280.

[quote name='jacky shi']不同的自动档会在不同的转速换挡，上坡时候需要转速高了之后才能换挡，否则换到更高的档位，却扭力不够。
至于声音的话，排气系统也是要考虑的可能性。[/quote]

好吧~谢谢

If the RPM stays between 2k and 3k, you don't need to worry about the engine. Jacky was right, when the car shifts, depends on the RPM, as well as the speed of the car. If your car is moving uphill, it's not gonna be the same as it runs on level surface.

I would also suggest you check the exhaust. I had the noise issue with my car two years ago. It sounded like a big truck. I replaced my worn exhaust, and the noise disappeared.

Sorry cann't type Chinese here, and good luck!

[quote name='wishing']If the RPM stays between 2k and 3k, you don't need to worry about the engine. Jacky was right, when the car shifts, depends on the RPM, as well as the speed of the car. If your car is moving uphill, it's not gonna be the same as it runs on level surface.

I would also suggest you check the exhaust. I had the noise issue with my car two years ago. It sounded like a big truck. I replaced my worn exhaust, and the noise disappeared.

Sorry cann't type Chinese here, and good luck![/quote]

thanks