What is most common cruise control problem? 1982 240D (Full Version)

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What is most common cruise control problem? 1982 240D

  

Scuddog -> What is most common cruise control problem? 1982 240D (6/6/2008 4:17:18 PM)

Hello!  My 1982 240D cruise control does not work.  What are the top issues that I should address?  Are these somewhat simple to do?  Is there a diagnostic to see what the real issue is?  I am ready to take my 240D across country but the buzzing from the gas pedal makes my foot tingle (the bad way!) after about 20 minutes.  Any info would be helpful.  Thanks.[;)]

  
mb124d -> RE: What is most common cruise control problem? 1982 240D (6/7/2008 7:37:20 AM)

I have driven 300Ds for 28 years (time flies...) and only twice had cruise control problems. They were both easy to fix. Check for vacuum leaks around the C. C. components. Anything from a cracked vacuum line "t" to a leaking hose. A hand vacuum pump with gauge is a great tool for a MB owner.

ForcedInduction -> RE: What is most common cruise control problem? 1982 240D (6/8/2008 3:41:36 AM)

The cruise control unit, brake switch, clutch switch (if you have a manual) and corroded brake light contacts are the most common problems I hear of.

The control unit has solder joints that crack with age and loose contact.
The switches also wear and get out of adjustment.
The brake lights may work but corroded contacts will not provide a positive ground path for the cruise unit to see.

Drrty240D -> RE: What is most common cruise control problem? 1982 240D (6/12/2008 5:02:47 PM)

1982 240D cruise is all electronic - no vacuum.  The cruise amplifier (located driver''s side under dash on left near fusebox) can get funky with age and begin to perform erratically.  You can usually get one cheap at a junkyard and take a chance it may solve your problem.  If you know a little about electronics you can take yours apart and check for bad solder connections on the circuit board and repair them.  A rebuilt unit costs about $250.

[image]http://home.ptd.net/~fscheel/images/amp.jpg[/image]

The cruise servo (engine bay) unit''s internal contacts wear with age because the servo is directly connected to the throttle linkage, so every time you depress/release the accelerator the servo''s contact brushes wear away at the contact points on the servo''s internal circuit board.  This sends a weak (or no) signal back to the cruise amplifier and in turn the system can''t properly control the throttle because it has no idea of the current throttle position.  Rebuilt servos can be had but they are expensive @ $325.00.

[image]http://home.ptd.net/~fscheel/images/servo.jpg[/image]

Scuddog -> RE: What is most common cruise control problem? 1982 240D (6/12/2008 6:02:43 PM)

Dirty D - thanks for the info...  I''ll start with the amp and go from there.  Appreciate the tip.
[8D]

  

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