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Are you on a flat road when this happens, if so it is not normal, if you are climbing it is normal because this car is underpowered for that and the cruise will lose speed, have first hand experience with this .
It could be something a simple as the cruise control switch(s)... or it could be the Cruise Control Module located in the engine compartment. There's also a 'clock spring' in the circuit between the steering wheel & the cruise module. Note: there are two sets of contacts in the brake lamp switch, one set for the brake lights, the other for cruise control. Properly diagnose the 'CAUSE' of the problem. Otherwise you could end up buying parts you don't need. Proper diagnosis is a 'hands-on' activity, which is nearly impossible to achieve here under the FixYa website
I bought my 2007 Hyundai Elantral about 8 months ago and have loved it! But on my way to work this morning, mine did the same exact thing that you have described here. I assumed it was a fuse (in denial about the fact that it could be something much more serious). Have you found anymore out regarding this problem since you posted this?
I set my Cruise Control at 60mph it will hold there, then it will beginning ... and it down shifts the Traction Control light will kick on start flashing and I'll notice a rough bogging feeling as the MPH are climbing. On Monday I replaced the spark plugs because I hadn't since I bought the car, ...
I had same problem (cruise control/dashboard lights) for the past month with my 2000 Elantra. Replace the tail lights bulbs - my problem was caused by a problem with the double filament within the bulb. Essententially, there was a short when I turned on the lights or hit the brakes.
I did this last night and everything is working properly now.
there are alot of harnesses to unplug.they missed a few by the sounds of it.
the cruise control is a cylinder that is vacuum operated and connected to the throttle cable.
check the vacuum lines and the wiring and make sure no wiring has been damaged installing the new engine.look for a plug that has clean looking pins,as the plug on an 8 year old car is clean on the inside.
make sure the cruise control cable to the throttle isn't too loose, if it is ok, check your brake switch. if it is sending the signal the brake is on it will not allow cruise to work and will do same thing as described about the set light.
I have this same car. The place you set speed control is on the windshield wiper switch on the right side of the steering column. The button with the indicator light has to be pushed in order to use the cruise control but just because the indicator light is on, it does not mean the cruise is on. Hope this helps a little. If you need more info and someone else doesn't answer more eloquently.. I'll check back and try to give you more info. :-)
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