Found this online.. And tired of typing it to everyone asking.. So here you go

This is used for clearing codes by disconnecting the battery cable for 15 mins. Be sure there is no cell phone chargers/lap top/anything like that plugged in. While cables are disconneted i always cycle the key. And turn the head lights on. Then follow it up by the relearn process.

Battery relearn
Because your vehicle’s engine is electronically controlled by a computer,
some control conditions are maintained by power from the battery. When
the battery is disconnected or a new battery is installed, the engine must
relearn its idle and fuel trim strategy for optimum driveability and
performance. Flexible fuel vehicles (FFV) must also relearn the ethanol
content of the fuel for optimum driveability and performance. To begin
this process:
1. With the vehicle at a complete stop, set the parking brake.
2. Put the gearshift in P (Park), turn off all accessories and start the
engine.
3. Run the engine until it reaches normal operating temperature.
4. Allow the engine to idle for at least one minute.
5. Turn the A/C on and allow the engine to idle for at least one minute.
6. Release the parking brake. With your foot on the brake pedal and with
the A/C on, put the vehicle in D (Drive) and allow the engine to idle for
at least one minute.
7. Drive the vehicle to complete the relearning process.
• The vehicle may need to be driven 10 miles (16 km) or more to
relearn the idle and fuel trim strategy along with the ethanol content
for flexible fuel vehicles.
• If you do not allow the engine to relearn its idle trim, the idle quality
of your vehicle may be adversely affected until the idle trim is
eventually relearned.
• For flexible fuel vehicles, if you are operating on E85, you may
experience poor starts or an inability to start the engine and
driveability problems until the fuel trim and ethanol content have been
relearned.

 

Would this process help with installing new parts? Like camshaft position sensors and Vct solenoids? I ask because after changing those items yesterday. My truck started dying at stops and turns. And shakes like hell when I rev the engine to 2000 rpm. Do I have to let my truck relearn its idle with these new parts?

 

I would say any time the battery is disconnected for heavy maintenance on the newer vehicles you should do the relearn process. I would bet the battery in your case was disconnected for more than 15 min. so yes (but this is assuming you have a newer truck)

 

do you know what years are covered with these instruction? (19?? to present)

 

04 supercrew 4x4.
I'm gonna try that in the am thanks

 

Im going to guess it works for any ford fuel injected vehicle ... I know some chryslers have a bit different relearn

 

Now when it says run the engine till it reaches normal operating temperature. Then let it idle for 1 minute does it mean rev it up till my temp gauge is in the middle? Then let it idle or just start it, let it run by itself (idle) then when the temp gets in the middle let it idle for another minute?

 

Hell yah!!!!! It worked!!!!!!!

 

 

I tried the relearn process, and no success. Maybe I did something wrong. I do not believe that I left the AC on when I put it in and drive. Crap, I didn't put it in gear and let it idle. So...I guess more to come once I try it again. Thanks for the info though. I was pulling me hair out trying to figure out what was going on. I changed the plugs and wires and then the stalling while coming to a stop started to happen. Hopefully this fixes the problem.