Quote:
Originally Posted by rGS
- I noticed while driving with cruise control set to 55 mph, that when I am going down a gentle hill, the RPMs drop a little, but when I'm going down a relatively steep hill, the RPMs spike like higher than 2500 RPM. Why is that?
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Our Honda minivan has something called "grade logic" where it downshifts going down hills to help control speed. Maybe your van has the same. On the Honda, it doesn't engage unless the driver touches the brake. Maybe yours has similar rules, like it only engages if you touch the brake, or if the cruise control is set.
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