cruise control not working properly!

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Northstar Engines and System Technical Discussion Discussion, cruise control not working properly! in Cadillac Engine Discussion; w/cruise set it won't accelarate w/accel button,and when going up hill let's say at 70 mph it backs down to ...
  1. #1
    coffeebreak1 is offline Cadillac Owners Member
    Join Date
    Jan 2004
    north carolina

    cruise control not working properly!

    w/cruise set it won't accelarate w/accel button,and when going up hill let's say at 70 mph it backs down to about 55 mph any help w/this please

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  3. #2
    elwesso's Avatar
    elwesso is offline Cadillac Owners Master
    Automobile(s): 2005 CTS-V, 1994 Infiniti Q45
    Join Date
    Jan 2003

    Re: cruise control not working properly!

    Do you have any diagnostic trouble codes? I konw that the OBD will throw a few codes for cruise control...

    Turn the ignition on, press OFF and WARMER at the same time, and tell me what the display reads out.....

  4. #3
    Aurora By Olds is offline Cadillac Owners Fanatic
    Automobile(s): 2000 DTS
    Join Date
    Oct 2003
    Fort Myers, FL

    Re: cruise control not working properly!

    OBD I will doubtfuly throw any codes for cruise control.
    Find the servo under the hood, and check for good strong vacuum from each of the vacuum lines while the engine is running.
    If you don't suspect any vacuum leaks, then I would look at servo replacement.
    I don't know how to test one, maybe someone else can give a little heads up on that.
    I know in my dad's delta 88 work car, its gone through a few in its 200k mile lifespan.

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