Cruise control Issues

Douglas Walker

Registered User
Recently been having problems with my cruise control on my 89sc w/5speed. It engages and works but it surges. The boost gauge surges back and fourth from lets say -6 to -3 constantly. Im assuming vac leak but does anyone have any quick thoughts on what to check or replace.

Thanks
Doug
 
Last edited:
Mine Is Doing This As Well. Stays At Steady Speed, But Engine Has Surge, Gauge Fluctuates About 3 Hg-in.
 
Same here

acb92sc said:
Mine Is Doing This As Well. Stays At Steady Speed, But Engine Has Surge, Gauge Fluctuates About 3 Hg-in.



Mine is (or was) doing the same thing.

Drove it 1,600 miles round trip (Ft. Lauderdale to Maxton, NC) a few weeks ago. On the way up, when I first engaged the cruise it would go a few miles and then start surging – about 3 Hg-in on the gauge. Sometimes the surging was so annoying I turned the cruise off and then turned it on again. It would work fine for ten or 20 miles, but then the engine would start surging again.

On the way back, the cruise worked fine.

When it surges on a flat highway, the car acts as if it’s starting up a hill and needs more fuel to keep the speed constant.

Where’s the “servo” that controls the cruise located?

Eddie
'90 5-speed SC
'97 LX Sport
 
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