I would not try myself to address all the circumstances you list, but I will offer my experience when it comes to throttle control with a JK on a steep decent. Remember the JK is a drive by wire system, that is, there is no direct linkage between the gas pedal and the throttle body on the engine. The foot pedal just sends a signal to the computer which in turn interprets that, along with other collected information, as a setting for the throttle. My experience, and I have taught this to other JK drivers which report an increased level of throttle control when making a steep decent.
Simply put, how to "talk" to the vehicle computer! With no keyboard or mouse, the only thing you need is the brake and gas pedals believe it or not. The computer monitors these two inputs and reacts accordingly in a steep decent scenario...so all you have to know is how to
using these two inputs to convey what you want to do to the computer.
When starting a steep decent, if you stay off the gas the throttle will stay very closed and the engine will tend to run slow. Now with the gearing you have, the engine may speed up, so this may not totally apply. In fact, the engine may run too slow, esp with low gearing, and you might want to speed the engine up a bit. So, you tap the gas pedal sending a request to the computer to speed up and the engine speeds up, in fact, when you take your foot off the gas pedal, the engine will stay at the higher rpm and will not return to the slower speed you were at! What you did was "tell" the computer you wanted a higher rpm and the computer answered your request....but, it thinks you want to stay at the higher rpm and will not return to the slower speed when you take your foot off the gas pedal....so, how do you "tell" the computer you want to slow down again? Simple, just tap the brake pedal and send that request to the computer...and it will now know that you want to go slower again and the throttle setting will return to a lower level. Sounds funny, but it works every time for me and others that I have gone through this scenario under real driving conditions...
The actual way the system "works" may be totally different than I describe, but I am describing the way it "behaves." Enough BS for now.
PS - this is for a manual tranny only - no experience with an auto.
08 JK 23S - Colorado Jeep Club No. 204
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16 JK Rubi with all the trimmings
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I do not consider myself a smartass. I point out the obvious, search for the truth, and speak fluent sarcasm. I am, by experience, an accomplished curmudgeon.
Last edited by RockyClymer; 09-16-2012 at 11:46 AM.
Reason: Added PS