1983 Mercedes Benz 380sl Cruise control surging

1983 MERCEDES BENZ 380SL
110,000 MILES
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STANGAR2
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  • 4 POSTS
My 1983 380SL Mercedes accelerates and then decelerates (surges) at freeway speeds. Hitting a bump or small rise seems to start the surging. I can stop the surging by controlling the accelerator pedal movement, but another bump will start the surging again.
Any advice?
Aug 2, 2013 at 8:03 AM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,240 POSTS
Has the check engine light come on? Have you checked fuel pump pressure?
Aug 2, 2013 at 12:18 PM
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STANGAR2
  • MEMBER
  • 4 POSTS
No engine light. New pump.
I have two 1983's . Same problem in both
Aug 2, 2013 at 1:34 PM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,240 POSTS
That is a tough one then. Have you checked to make sure there are no vacuum leaks at the engine or intake manifold?
Aug 8, 2013 at 11:24 AM
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