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2018 Sport inconsistent acceleration/boost

As far as the term 'relearn' goes, see page 233 re Adaptive Learning for the steering system and page 293 regarding the idle and fuel trim strategy. The Manuals for the pre 2016 models actually had a part about the Automatic Transmission Adaptive Learning but that is no longer mentioned in the post 2015 Manuals.

Peter
I don't have the manual handy, but I would bet every single make and model has an adaptive transmission learning though for the last 10 years at least? So I would believe just because it is not mentioned in the manual doesn't mean it is no longer a feature, perhaps just one they felt was fine 'behind the curtain'?
 






FYI to anybody following this - since I retrained the transmission by disconnecting the battery and taking it out and beat the $&% out of it a couple times, the vehicle has remained in beast mode since. Markedly better throttle response and tighter gear shifting. Hopefully it persists. My final hypotheses where I landed: by the time I had taken devliery with ~400 miles, the tranny had been trained to drive wimpy and the first 2-3 tanks of gas were likely 87 octane. So took a while and the battery disconnect to shake the cobwebs out. Here's hoping it persists! (I also bought a device showing it is throwing no codes for good measure)

Cheers,
Dan
 






Hi Dan. Good to hear. I would think that the resetting of the idle and fuel trim strategy may have had something to do with it as well. Especially in regards to your post #3 where the transmission shouldn't come into play. Not sure what a 'wimpy' drive is like but I don't push mine very much at all and take short trips ( < 5 > miles) around the village for shopping etc. On the occasional hwy trips into the city I rarely exceed 70 mph and my Explorer hasn't encountered any of the issues you initially mentioned. I've had mine for 19 months now and just broke the 4500 mile mark.:) Hope your Sport continues to perform for you.

Peter
 






FYI to anybody following this - since I retrained the transmission by disconnecting the battery and taking it out and beat the $&% out of it a couple times, the vehicle has remained in beast mode since. Markedly better throttle response and tighter gear shifting. Hopefully it persists. My final hypotheses where I landed: by the time I had taken devliery with ~400 miles, the tranny had been trained to drive wimpy and the first 2-3 tanks of gas were likely 87 octane. So took a while and the battery disconnect to shake the cobwebs out. Here's hoping it persists! (I also bought a device showing it is throwing no codes for good measure)

Cheers,
Dan

Interesting, keep us posted.

I can understand that the transmission programming may need to be tweaked since the original programming was a general start(much like an engine), but if you drive aggressively right away and then tone it down after a while, it should shift no differently than if you take it easy and then beat on it.

Much like engine tuning/learning. If you are running wide open throttle all the time, the engine doesn't change what it learned at less aggressive throttle situations based on what you were doing at WOT.

My reasoning:
1. You're driving slow and easy, transmission shifts somewhat gently to maintain a "comfortable" ride.
2. You're slightly aggressive, transmission revs higher and shifts firmer.
3. You beat the snot out of it, transmission revs to keep power in peak range and shifts firm to keep power going to the wheels(and reduce wear when shifting).

If you start out driving under situation #3 above, and then drop down to situation #1, all the "learning" from situation #3 should not affect #1.


Is my reasoning wrong?
 






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