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Old 08-13-2001, 07:24 PM
JimSmith JimSmith is offline
Join Date: Jul 2001
Location: Old Lyme, Connecticut
Posts: 3,596
Try checking the Oxygen sensor in the exhaust system. I had a similar problem on my 1986 190-E 2.3-16, a grey market car so some things may be different, and it turned out to be the Oxygen sensor. Apparently when one of the inputs into the computer for emissions goes out, the computer shuts down and the car runs in a purely mechanical mode to make sure you do not get stranded. In this mode the mileage can be really poor. That was the explanation I got, and when the sensor was replaced the car ran great again. I still only get 27 mpg combined driving, but a buddy of mine with a car like yours, and a 5-speed, routinely gets over 30 mpg and he is an aggressive driver. A lot of his driving is on the highway, but still that is way better than 14 mpg. Good Luck. Jim
1986 Euro 190E 2.3-16 (291,000 miles),
1998 E300D TurboDiesel, 231,000 miles -purchased with 45,000,
1988 300E 5-speed 252,000 miles,
1983 240D 4-speed, purchased w/136,000, now with 222,000 miles.
2009 ML320CDI Bluetec, 89,000 miles

1971 220D (250,000 miles plus, sold to father-in-law),
1975 240D (245,000 miles - died of body rot),
1991 350SD (176,560 miles, weakest Benz I have owned),
1999 C230 Sport (45,400 miles),
1982 240D (321,000 miles, put to sleep)
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