A good buddy of mine has a 5-speed 190E from 1986 with 205,000 miles. It runs unbelievably strong still, and gets great mileage. He is experiencing some intermittent operation of the cruise control system. When he flips the stalk up to accelerate the car responds and accelerates. Some of the times when he lets it return to its normal position after reaching the desired speed, the unit fails to take over and control the car's speed. When this happens he can stop the car, shut it off and restart it, and then the cruise usually works. Is there a sensor or some feature of the system that is dirty or needs adjustment? Any clues would be appreciated. Thanks, Jim

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Own:
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

Owned:
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)