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Unread 08-24-2013, 11:38 PM   #1
pauld73
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2010 KK Liberty 
 
Join Date: Apr 2010
Location: Pittsburgh, PA
Posts: 45
My 2010 KK Experienced a miracle!!

Ever since I got it back in March, 2010, my KK has gotten 15 or so mpg. I do mostly driving around town with not much highway driving. When the odometer hit around 10,000 to 11,000 miles, (I only put 3,000 miles on it per year) a few weeks ago, my mileage suddenly went up to 18 or 19 mpg. I drove the same way that I always have and there has been no change in fuel, tires, etc. I have noticed that going down a hill at 30 mph or so, it feels like the transmission is now shifting into 4th gear, when before it was always in 3rd gear. Has this happened to anyone else? I am wondering if Jeep has the computer ROM programmed so that for the first 10,000 miles the transmission stays in 3rd gear unless you exceed 40 mph (no matter what the manifold vacuum is). Now it seems I am shifting into 4th gear at <30 mph when the manifold vacuum is high like going down a hill.

Paul

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Unread 08-25-2013, 08:13 AM   #2
Gageraid
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2008 KK Liberty 
 
Join Date: May 2012
Location: Branchburg, New Jersey
Posts: 1,352
This is normal. Most people get crappy mileage till the engine is broken in. Enjoy.
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Unread 08-25-2013, 11:47 AM   #3
Drednot
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1991 YJ Wrangler 
 
Join Date: Aug 2005
Location: phoenix, az
Posts: 1,277
Yeah, the trans has a computer that learns your driving habits and changes shift points and pressures. I've also read that it has a break in program for the torque converter clutch that can feel like a shudder at certain times
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Unread 08-25-2013, 06:05 PM   #4
brunolambert
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2008 KK Liberty 
 
Join Date: Feb 2013
Location: Sherbrooke, Qc
Posts: 130
Quote:
Originally Posted by Drednot View Post
Yeah, the trans has a computer that learns your driving habits and changes shift points and pressures. I've also read that it has a break in program for the torque converter clutch that can feel like a shudder at certain times
How do you reset that computer? I obviously don't drive like the previous owner because I never did more that 250 miles on a tank (bone stock jeep).
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Unread 08-25-2013, 07:16 PM   #5
lfhoward
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2008 KK Liberty 
 
Join Date: Nov 2012
Location: Ann Arbor, MI
Posts: 484
To reset, disconnect your battery overnight. I just had some work done on my KK where the mechanic had the battery out for several hours, and the computer is currently relearning how to drive efficiently. This is a pain when the program was already optimized, but I can usually get it back to where it was after a couple of weeks. The difference for me is usually about 2 mpg.
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