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Old 05-20-2013, 06:15 PM   #1
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Question...

This may be the wrong forum....

So DW ford expedition would have its transmission "jump" ever so often. This would be around town normally when accelerating onto the freeway or going over a hill. It only has about 36K miles on the truck.

So we had the dealer check it out locally and found no real problems with
the transmission. But found a new available computer shifting update that
should fix it. They did apply the software update were going charge about $90.00 But due some waiting issue they did wave the charge....

So we have gotten the vehicle back and have noticed that it appears to have stopped.

So while understand the computer learns you driving habits. We purchase this in the southern states and about 100 foot elevation. Now we live at nearly 5000 foot elevation. So does this elevation computer "training" make a difference?

Please help me understand.
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Old 05-20-2013, 07:25 PM   #2
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The trans shift program " flash " the dealer performed , would be similar to ungrading your home computor from windows XP to windows 7. A different operating system . Given the inputs from sensors the trans shifts differently, than with the previous program.
The learn process, relates more to how you control the inputs( mostly the throttle possision sensor ) if you normally accelerate slowly the controller applies a smooth shift for that rate of acceleration, the faster you normally accelerate the quicker the shifts will be performed . This process can become a little confused if the vehicle is constantly being driven by 2 or more drivers with vastly different habits. The learned section is held in memory , until the battery is disconnected, and can take 20mins +driving time, to re-learn after start up. Like the difference between waking your computor up after it goes to sleep , vs, booting it in the morning when it was shut off overnight.
Any help? Altitude should have nothing to do with the learning process.
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Old 05-20-2013, 07:41 PM   #3
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Thanks Skip,

So how much merit does this flash really have in fixing the issue. As this shifting was at random and would not always "jump" every time.

Thanks
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Old 05-20-2013, 08:13 PM   #4
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The program re-write " flash " could have been to correct the way the trans controller re-acted to one sensor input at one particular time, or the coralation of two sensors ( RPM, to speed; or trans temp to TPS )or the way the engine was reacting to the A/C compressor engaugement . If there was a flash for your particular complaint , rest assured you were not the only one with the complaint. Ford engineers would have gotten the complaint , duplicated it in a test vehicle and re-written the program to correct the issue. Could have been something simple like delaying the A/C compressor till well after the shift or even holding it till you reach crusing speed. Or any of 100 + adjustments.
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Old 05-20-2013, 08:20 PM   #5
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Had a programming update done to our '05 Honda Odyssey as it would shift in and out of lockup. Now it won't downshift when I need it to but it did stop the shuddering that is was doing, but now it could be a safety hazard. Sometimes upgrades are downgrades!
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Old 06-12-2013, 11:43 PM   #6
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On our trip 2 weeks ago it drove like a champ. No problems since with the update on the firmware.
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