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My educated guess would be that the speed sensor is broken and reading slow, so the cruise control unit doesn't know what speed the car is actually going. Go to your library and see if they have the shop manual for your car. It will have the exact answer. More than likely, with the primitive chip, the computer had it engaged at 72. then something happened, an accident, a jolt, lighning (not likely lightning) or something shorted out, freezing the chip at 72. if you replace the chip, it should do the trick. Hint, a simmilar thing happened to me.

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โˆ™ 2005-12-21 10:01:02
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Q: Why would cruise control in a 1990 Honda Accord speed the car up to 72 mph when engaged?
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