Exhaust Tone just sounds off, any ideas?

[Mustang_Lou]

I believe the same thing can be done by disconnecting the negative battery terminal for a few minutes (at least the KAM and fuel trim resets).

Did you ever try that?

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[Leigh_bullitt]

Finally got this fixed on my 2020 Bullitt.
tried the adaptive learning delete but eventually it sounded off again.
But the fix was straight forward…..

we both have euro bullitts and both have tunes and both have the same symptom.

the fix was a crank Relearn….
I guarantee the other guy tried to do a crank relearn while the car was tuned?.
it will say it’s been successful but it will actually throw a code.
this won’t show up unless you look for it. So basically driving around with the crank not learned and not adapting because it’s throwing a code.
Will throw timing off, fuel pressure and everything else.

the fix is to put the car back to stock before the crank relearn. Reason being the crank relearn won’t take to the new strategy on the new tune. it can be done on the stock strategy.

car runs great now. Exhaust has a nice toned rumble and also fixed the low rpm hesitation and rough running I’ve been having.