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1983 Mercedes Benz 380sl Cruise control surging

Tiny
STANGAR2
  • MEMBER
  • 1983 MERCEDES BENZ 380SL
  • 110,000 MILES
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?
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Friday, August 2nd, 2013 AT 3:03 PM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Has the check engine light come on? Have you checked fuel pump pressure?
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Friday, August 2nd, 2013 AT 7:18 PM
Tiny
STANGAR2
  • MEMBER
  • 4 POSTS
No engine light. New pump.
I have two 1983's. Same problem in both
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Friday, August 2nd, 2013 AT 8:34 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
That is a tough one then. Have you checked to make sure there are no vacuum leaks at the engine or intake manifold?
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Thursday, August 8th, 2013 AT 6:24 PM

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