I HAVE A PROBLEM WITH THE CRUISE CONTROLE. WHEN I FIRST BOUGHT MY 87 300TDT AND WAS DRIVING IT WITH THE CRUISE ON I NOTICED IT SURGING EVERY ONCE IN A WHILE IT WULD EXCELERATE ABOUT 4 TO 6 MPH ABOVE SET SPEED QUICKLY I FIGURED MY CRUISE WAS GOING. AFTER ABOUT A YEAR I INSTALLED A CB RADIO IN THE CAR AND NOTICED THAT WHEN I KEYED THE MIKE THE CAR WOULD SURGE IN CRUISE. THEN I NOTICED THAT EVERY TIME THE CRUISE ACTED UP WAS WHEN I WAS BUY ANOTHER VEHICHLE WITH A CB. I HAVE SINC BOUGHT A 300 SDL AND IT DOES THE EXACT SAME THING IS THER ANY WAY TO AD SHEALDING OR OTHER FIX TO CONTROLE IT? I BOUGHT THE 300TDT WITH 120,000 MILES ON IT IT NOW HAS 469,000 MILES MY 300SDL WAS BOUGHT WITH 180,000 AND IN 4 MONTHS IT NNOW HAS 217,000 MILES. BOTH CARS STILL RUNNING FINE. EXCELENT CARS JUST FUNKY CRUISE CONTROLE.
it sounds foolish but mb says if you have the wrong voltage bulb ib the brake bulb position, it cann cause funky cruise control problems because it uses the impulse from brakes to shut off the cruise and even if you dont step on the brake . also make sure the bulb holders are not corroded or dirty.try replacing your brake bulbs w/ oem bulbs . I had this problem on my 300cdt and my 300tdt. good luck
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