My 2006 Sprinter has over 30,000 miles and when going up long, steep slopes it slows down, but keeps running smooth. I did change the fuel filter recently and that did help but did not solve the problem. I have used some additives which has not helped. It is not driven during the winter and kept in an unheated garage (it does not freez) and the fuel (diesel) tank is not full. What do I need to do?

YOU HAVE A AIR LEAK IN THE TURBO SYSTEM CK HOSE'S MY 2006 3500 SPLIT THE HOSE HIGH WHISTLING SOUND. LOW POWER / AND LIMP MODES TOO. ORDER THIS AND BINGO IF FIX IT . YES THE OLD TURBO RESONATOR HAD SPLIT TOO. I did not use the o-ring from the old part I found one 1 side down that fit tight around the new part. A loose o-ring is going to weak air too. Got mine on ebay.


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Replace muffler with a high flow aftermarket muffler.

Try using low ultra sulphur diesel, not ultra sulphur diesel. let me know if that helps.

I hate to tell you but these diesels are strong but loose power going up steep hill the trany shifts into low gear but its not going to go up fast, you can have the dealer change the shift pattern to get a little more power out of it or you can manually downshift to go faster, hope this helps.