Question about 1992 Cadillac DeVille

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I have a 1992 adillac seville. Whatever speed I go at the idle will keep it there as if it is on cruise control. The only time the idle will come back to normal is when the brake is depress , just like in cruise control. Funny thing is that the cruise has ot worked in 2 years yet this problem is a month old. Even on initial star up engine will race yet comes right down when brake pressed.

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  • royorbison May 02, 2009

    Can't see how pressing the brake would lower the idle if it was the mat jamming the gas pedal, linkage is not binding, no service lights of any kind.. Napa repair said isc motor would not be affected by pressing thew brake pedal, They also said it appears to be working fine. They did a test using a 9 volt battery and it repsponded properly. ????? Thanks for your input. Al

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  • 607 Answers

Check for a binding ISC motor L/S throttle body, binding linkage, or better yet, check the FLOOR MATS for jamming the gas pedal. Any service lights on ? Hope this helps

Posted on Apr 22, 2009

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1 Answer

What causes the speed to fluctuate when you set the cruise control?


if it just started to happen you may have lost a magnet off the drive shaft. If it is a front wheel drive then you would have two magnets on the flywheel if you lost one magnet it would cause problems.
The other possible cause if the sensitivity setting is set too sensitive then the cruise control will surge .
Setting it lower will allow it to slowly respond to speed changes but if going up hill it will take a while to increase the acceleration . Or going down hill it could accelerate too much before the cruise control realises it is going downhill
Also a very wet road can cause the wheels to spin and cause the cruise control to lose the plot and accelerate to dangerous speeds.
I have had this happen to myself once so be wary of cruise control use in wet conditions.

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