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  #1  
Old 06-09-2001, 07:29 PM
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Join Date: May 2000
Location: Boise, Idaho
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My 1980 450SL has a surging cruise control. Approximately 2-3 mph at 40-75 mph, and the surging stops after about 8-10 minutes of driving. What should I be examining or where should I look? The vacuum system, the control or the linkage? Thanx in advance, Roger
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1983 300CD 246k sold
1998 C230 52k
1980 450SL 75k needs AC
1999 Subaru Outback Ltd 43k
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  #2  
Old 06-09-2001, 10:09 PM
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Location: Suwanee, GA, USA
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The first thing I do on these is take off all of the throttle links one at a time and clean and grease them.
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  #3  
Old 06-09-2001, 11:17 PM
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And adjust the play in the cable.
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Steve Brotherton
Continental Imports
Gainesville FL
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  #4  
Old 06-11-2001, 01:11 PM
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Thank you Benzmac and stevebfl for your response, I'll try to check the linkage for play and dirt this week. Roger
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Roger
1983 300CD 246k sold
1998 C230 52k
1980 450SL 75k needs AC
1999 Subaru Outback Ltd 43k
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  #5  
Old 06-11-2001, 10:12 PM
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Join Date: Jun 2001
Location: Omaha, NE
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Incidentally, the MB-recommended lubricant for throttle linkage is automatic transmission fluid. Regular grease may attract too much dirt and eventually gum up the works.
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'93 400E
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  #6  
Old 06-18-2001, 03:37 PM
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Join Date: May 2000
Location: Boise, Idaho
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Continued help on surging Cruise control

This weekend, I cleaned and lubricated the 3 throttle connections on the top of the engine. Are there more? As the speed surges, the speedo changes about 2 mph, the rpm 100 revs and the throttle pedal moves a bit. All changes are at the same time and rate. After 15 minutes, the surging stops and the 450SL cruises steadily. Am I looking at black box change?
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Roger
1983 300CD 246k sold
1998 C230 52k
1980 450SL 75k needs AC
1999 Subaru Outback Ltd 43k
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  #7  
Old 06-18-2001, 04:23 PM
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Join Date: Mar 2000
Location: Gainesville FL
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The cable has a turnbuckle type adjustment in the middle. The cable should not be tight but just short of it. If it has anything to do with your problem there will be a half inch or more of play in the cable.
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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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