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  #1  
Old 07-09-2010, 08:18 AM
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Cruise con. loses speed during trip

My '79 116 has the OEM vacuum diaphragm and amplifier setup for the cruise control. The amplifier and speed sensors are rebuilt / new. However, the cruise continues to lose several MPH on a ~ 20 mile highway drive. The speed just drifts down over the course of the 20 miles, prompting me to reset the speed higher.

If this is a vacuum problem, why would the amplifier not detect this lower speed and correct the problem? Or, as perhaps somewhere could explain, is this a symptom of a maladjusted amplifier?

Thanks, -H

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  #2  
Old 07-09-2010, 08:54 AM
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99% of the time that issue is from the amplifier.
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Old 07-09-2010, 03:49 PM
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Thanks!
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Old 07-11-2010, 05:43 PM
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I had the same problem on a 1992 124. The amp was bad.

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