Question about relearning idle and fuel curves - Mustang Evolution

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Old 05-09-2015, 12:38 PM   #1
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Question about relearning idle and fuel curves

Hello all, recently I have had to disconnect the battery 2x. For arguments sake both times were for at least 45 minutes. Should the car have run differently until it learned the idle and fuel curve? The reason I ask is because it didn't act any different than before, but my gf's 2003 Mazda had to relearn the 2x her battery was disconnected for about 30 minutes. My car is a 2004 Mustang vert 3.9L V6{4spd} w/approx. 130,000{. Since it didn't have to relearn anything{with the exception of radio presets}, is there a problem with the car's computer not recognizing the disconnecting or is this normal? Thank you
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Old 05-22-2015, 07:15 AM   #2
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bump
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Old 05-22-2015, 07:33 AM   #3
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In my experience with a GT, the relearn process isnt that noticeable unless you had some other issue going on beforehand. The only difference ive found between the learning stage and when its done was idle was a bit higher, and sometimes a tad shaky at different times. I dont know bout the v6 but the gt has a particular process to aid the relearning process. involves idling for maybe 10 minutes, turn the ac on for a few minutes, then drive on the highway for 5 to 10 miles i believe. an alternative to help the crank sensor, (again, a 4.6 issue) is to drive 60mph then let it drop to 45, then accellerate to 60, 45, 60,45 a few times and it should recalibrate. you will know its done when you no longer have a hidden engine code. Hope this helps a bit, but i dont have much experience with the 3.8 or 3.9. if anything, its another bump at least.
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Old 05-22-2015, 07:38 AM   #4
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Thank you for your reply, it's appreciated. Im just surprised in my case that there wasn't really any noticeable difference compared to the other car which was sooo dramatic.
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Old 05-22-2015, 07:59 AM   #5
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thats just the nature of some of those cars. they are wired up the butt. Even some of the new fords are a pain if you pull the battery i believe. I think it was a focus, but i could be wrong. changed the battery, and it wouldnt start because i didnt plug in a backup power source to the OBDII port to retain the computers memory.
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2002 GT 5sp. 16x,xxx miles
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Old 05-22-2015, 08:05 AM   #6
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Good to know. That's pretty messed up that newer technology has such a huge flaw.
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Old 05-22-2015, 08:08 AM   #7
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you will encounter some people that will say new technology and huge flaw are synonymous. lol.
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Old 05-22-2015, 08:38 AM   #8
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Sounds like it. We need to go back to the days of carburetors and emissions out the wazoo.
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