View Single Post
  #3  
Old 04-10-2013, 10:16 PM
JamesDean's Avatar
JamesDean JamesDean is offline
Electrical Engineer
 
Join Date: Apr 2005
Location: NE Ohio
Posts: 4,999
The older 10-pin cruise control system uses a vacuum device to pull the cable and thus set the throttle. A lot of times that device will leak and you will not have cruise. What also can occur is your cruise amplifier develops a cold solder joint and/or the capacitors on it fail.

I normally repair the 14-pin units as I've developed a test harness and setup to test and ensure that they work.

I have worked on a few 10-pin units (I think 5-6 so far), the only way I have been able to test them is to send them back to their owners and have them install the amplifier. So far each unit has been successful. Since I can't test them I don't ask much money for the repair work vs the 14-pin units.

One day I will make a proper test setup for them but I just haven't gotten to them.

So if I were you I would first check out the amp, its going to be cheaper to replace/repair than the vacuum servo is. I think a new/replacement servo is >150? Its been a while since I looked.
__________________
Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out.
Check here for compatibility, diagnostics, and availability!

82 300SD 145k
82 300SD 265k
87 420SEL 230k
89 420SEL 210k
89 560SEL 118k
90 300SE 262k RIP 5/25/2010
90 560SEL 154k
91 300D 2.5 Turbo. 241k
93 190E 3.0 235k
93 300E 195k
Reply With Quote