Disconnect batteries?
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Junior User
Joined: Nov 2003
Posts: 58
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From: Littleton, CO
Disconnect batteries?
I have a 2000 F250 SD SC AT. Does the truck learn from driving habits and set shift and power parameters, etc? If I disconnect the batteries for a few minutes will it go back to the original specs? No real problems just seems to be shifting early causing a little lack of power. Thanks for any input.
Post Fiend
Joined: Jun 2006
Posts: 5,497
Likes: 7
From: Central, Al
The tranny will learn shift patterns. I would recommend a BTS valve body or a sonnax/Tricum shift kit to firm her up a bit.
BTS - www.brianstruckshop.com
Sonnax - http://www.puredieselpower.com/catal...-kit-p-85.html
BTS - www.brianstruckshop.com
Sonnax - http://www.puredieselpower.com/catal...-kit-p-85.html
Senior User
Joined: Sep 2006
Posts: 484
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From: CT
as far as disconnecting batteries, just disconnect the negetives? both? and fireing up the headlights after the batteries are unplugged? and is it a good idea to do it after every engine modification?
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Post Fiend
Joined: Feb 2006
Posts: 11,892
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From: Middle Tennessee
Originally Posted by bigtorque
FYI, it takes 72 hours for the ECU to re learn new paramatters, so if driven conservative, under 2K rpm you may increase MPG. says ford technician.
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Post Fiend
Joined: Feb 2006
Posts: 11,892
Likes: 2
From: Middle Tennessee
Well, the only reason I said that is because the PCM relearning post has been on here some time ago. One poster vehemently claiming that the PSD cannot relearn. I believe it is because of the type of program, not being a closed loop, non OBDII compliant etc, but that was his position. (Remember, a standard OBD scanner wil likely not pull PSD codes).
We never resolved it but I would think that there would have to be some adaptability or there would be no need for all of those sensors. Of course if the program is a simple if-then one, then it can learn but it would be dependant on the amount of what-then that the computer is capable of doing. Still awaiting final resolution from this with some concrete facts, not just because "I said so".
I guess I may stumble across something on my shop DVD someday. Have I mentioned that I highly recommend that DVD?
We never resolved it but I would think that there would have to be some adaptability or there would be no need for all of those sensors. Of course if the program is a simple if-then one, then it can learn but it would be dependant on the amount of what-then that the computer is capable of doing. Still awaiting final resolution from this with some concrete facts, not just because "I said so".
I guess I may stumble across something on my shop DVD someday. Have I mentioned that I highly recommend that DVD?
Post Fiend
Joined: Feb 2006
Posts: 11,892
Likes: 2
From: Middle Tennessee
Originally Posted by Tenn01PSD350
We never resolved it but I would think that there would have to be some adaptability or there would be no need for all of those sensors. Of course if the program is a simple if-then one, then it can learn but it would be dependant on the amount of what-then that the computer is capable of doing. Still awaiting final resolution from this with some concrete facts, not just because "I said so".
If the stock PCM is a simple if-then and that is it, it will not relearn, just perform IAW a lookup table. That is not learning. But neither is it in other systems with the exception that the lookup table is more robust with a greater latitude in adjustment capability.
OK, I have bored even myself.
I just figured that if the stock puter and program were that lame, there would have been a better mouse trap on the market by now.