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Old 03-15-2000, 12:45 AM
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Gentlemen, I have an '86 300E with a faultiy cruise control. When I put the cruise on it engages, disengages, engages, disengages in a rapid fashion and keeps this jerking up unless I am going uphill in which case it seems to be fine. However as soon as I get to level ground or downhill the problem starts again. Would my problem be the amplifier or the actuator or something else? Thanks for your advice.

Alex
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Old 03-15-2000, 02:13 PM
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Alex,
Had the same cc problem with my '86 300E. Since I fixed it (about a year ago) it has worked flawlessly, so I must have done something right!
Actually there are 3 things worth doing:
1) remove the amplifier and carefully resolder all joints on the circuit board, as well as the connections to-and-from the board.
2) clean and oil (or light grease) the throttle linkage and joints.
3) clean and tighten the relevant ground connections in the cruise control circuit.

I did all 3 jobs at once, so I'm not sure what each of them contributed to solving the problem. The first, is probably essential; and the last two should be done anyway. You could always try the last-two first (they're the easiest), and if that doesn't work then pull the board.
Good luck, keep us posted.

Barrie
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Old 03-15-2000, 08:11 PM
GERMAN AUTOMOTIVE
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INSTALL A 33 OHM 1/4 WATT RESISTOR IN SERIES IN THE BLUE WIRE TO THE ACTUATOR,THIS IS BEST DONE AT THE CONNECTOR

M.F.
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Old 03-15-2000, 08:30 PM
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Thank you for your advice, I will try and see which one works better. Thanks again.

Alex
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