Question about 1985 Porsche 928

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My 1985 Porsche 928 S4 cruise con trol activates but drops off @ 1 mile/hr, and then surges heavy to make it back up. this is a rythmic pulsing that goes on to maintain speed. should I be looking mechanical, or electrical?

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What you are describing is a vacuum leak in one of the vacuum lines for the cruise control or a bad cruise control vacuum servo. I myself am a former owner of a 1979 Porsche 928 5 speed, a very beautiful and extremely powerful stock automobile. Good luck.

Posted on Mar 17, 2011

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Posted on Jan 02, 2017

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