84 300D Turbo

as stated, cruise control is not right- it surges at all speeds erratically-

is this an actuator problem or the "cruise control brain" under the dash problem?

Amp' problem.


.

__________________
[http://languageandgrammar.com/2008/01/14/youve-got-problems-not-issues/ ]

"A liberal is someone who feels they owe a great debt to their fellow man, which debt he proposes to pay off with your money."

I respectfully disagree; this can also be caused by a jerky actuator (internal problems) or linkage issues. I have two spare actuators, and only one of them is "jerky". I'm going to try to fix it this winter. I suspect that the "wiper" for the position feedback is worn/dirty/lost its spring or there is a lubrication issue.

__________________
86 560SL
With homebrew first gear start!
85 380SL
Daily Driver Project

http://juliepalooza.8m.com/sl/mercedes.htm

so of it is an amp prob. what contacts should I check- and how do I test the contacts while cc is on (if im driving and i put it on) cuz it dont work standing still.....

if it is an actuator problem, I will go to the yard and pull another- test to see if that fixes the problem- however I would like to be positive that is the issue before I buy a junk part I cant return

Which begs the question- how can I find out where the problem is?

Try this link. I had a similar problem. The GDL website is good cause it shows you how to test all the cruise parts. Before I went through the tests on the gdl website I actually called the guy, described the issue, and they virtually assured me it was the amp. Told me not to even bother testing the other stuff. Popped in a used amp and problem solved.

http://www.peachparts.com/shopforum/diesel-discussion/123036-cruise-control-repair-articles-post883130.html#post883130

__________________
Eric Zacharias

'88 300 SEL
'64 Ford Falcon
'99 Infiniti QX4

In think it can also be caused by bad speedo cable--is the needle unsteady?

Have one W124 that has unsteady needle when cold but when warm needle is fine. Cruise behaviour mimics this, i.e is fine when needle is steady.

__________________
Kent Christensen
Albuquerque
'07 GL320CDI, '10 CL550. '01 Porsche Boxster
Two BMW motorcycles