Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help

Go Back   PeachParts Mercedes-Benz Forum > Mercedes-Benz Tech Information and Support > Vintage Mercedes Forum

LinkBack Thread Tools Display Modes
Old 07-09-2010, 08:18 AM
Registered User
Join Date: Oct 2006
Posts: 8
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

Reply With Quote
Old 07-09-2010, 08:54 AM
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
99% of the time that issue is from the amplifier.
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator
Reply With Quote
Old 07-09-2010, 03:49 PM
Registered User
Join Date: Oct 2006
Posts: 8
Reply With Quote
Old 07-11-2010, 05:43 PM
Join Date: Sep 2005
Posts: 664
I had the same problem on a 1992 124. The amp was bad.

Reply With Quote


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On

All times are GMT -4. The time now is 03:47 PM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2024 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page