Unfortnately on the way home on I-80 west in northern nevada I noticed that when I set the cruise control, the car would "surge" quite a bit to maintain speed- fine I thought I'll just deal with the coffee stains all over my pants - but when the cruise cut out completely and started blinking at me and would not engage - I realized it would be a long, long drive back home (3hrs+ on boring desert interstate). Today I checked the battery connections to ensure they were tight (they were- but a little corroded with white stuff on the + battey cable). I also had autozone check the ObD II port - and the car came back with no codes present from the ECU. So I am at a loss to say the least. I know these cars will not engage the cruise if there is any fault present in the ECU or the check engine light is not on- but that is not the case here. This is an automatic 5spd - so no neutral safety switch problem (which is common with these cars on manual transmissions). The strange thing is that the cruise will work just fine at 35mph in town -but not at highway speeds (where I need it). I've heard of a ECU reflash - will that help? Thanks for the help, any info would be appreciated, especially since I am such a subie n00b. Under 70mph and the cruise usually will set and stay on without a problem (though the it does seem to buck/surge a bit to maintain speed), above that speed and the cruise will work for about 40 seconds before cutting out and blinking at me. I took the car to a dealer to check it out - after several hours diagnosing it they said they had found the issue - dirty brake fluid. Unfortunately their "fix" didn't work at all - the problem persists. The dealer is baffled, and so am I. Were these cars just not designed for cruise control above 70mph?
Check for a vacuum leak...or have someone check for a leak.
SOURCE: Bucking on Hard Acceleration
You best bet would be to look for the vacuum diagram and just take a day to make sure all of the lines to the engine and tranny are all correct. If its not it and while bucking the car feels like its going to turn off on you then it maybe a fuel delivery problem.
SOURCE: 2002 X-type Jaguar with 2.6 -- check engine light came on
My 2002 x-type did the exact same thing on many occasions and had many repeated trips to the dealership. This problem was ultimately cased by cracked hoses in the car's vacuum system (which is used in the cruise control and brakes). Have the dealer check the vacuum lines and the breather hose (mine had completely collapsed). Chances are they are leaking and causing your car to "buck" and the cruise to not work. Don't ignore this as it will affect the functionality of your brakes too over the longer term.
SOURCE: check engine light comes on on 1995 buick lesabre
sounds like a vacum leak check your lines for cracks
SOURCE: cruise control will not 'set' on '05 kia sportage
Check the brake lighf bulbs. If even one is burnt out, it throws the sensors.
Had the same problem replaced both bulbs and now the esp light stays off and the cruise control sets.
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