my mercedes starts great but when I try to go up a grade or step down on it it doesn't have any guts or shift down... when it is cold, just starting out, sometimes it runs right , but when it warms up it is gutless again.... love the car but just can't figure it out.... Mercedes garage said it was the vacuum pump and I put a new one on and it does the same thing.... any input would be so helpful ... I have checked vacuum hoses for pressure leaks but everything so far has checked out.. I read a lot of this year and model have the same problem but have never found an answer....
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I don't know what the vacuum pump would have to do with it, so I don't understand why they replaced it. I'd check the fuel filter, it sounds like you're not getting enough fuel. Typical diesel complaint when the fuel filter's clogged..
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I changed the fuel filter and still have no power until the turbo kicks in after about 1000 feet up the road .... I have a hard enough time trying to get out my driveway and it isn't steep.... when it is running right it runs so good you would never know anything is wrong with it.... it loves to run at 65 to 70 mph until you come upon a hill or grade and then it drops fast.....
I changed the fuel filter and still have no power until the turbo kicks in after about 1000 feet up the road .... I have a hard enough time trying to get out my driveway and it isn't steep.... when it is running right it runs so good you would never know anything is wrong with it.... it loves to run at 65 to 70 mph until you come upon a hill or grade and then it drops fast.....