Re: ECU and disconnecting the battery
It'll run fine if you disconnect the battery, as Soxx said it will only forget the minor things, mostly to do with compensating for engine wear. Takes very little time to relearn it.
Proud TQE Operator and President of SEFAG - the Society for the Elimination of Ford Automatic Gearboxes
Pacemaker headers + 2.5" exhaust
EF Fairmont interior
Lowered King springs
5 speed manual
Newest mod: EF Ghia wiring loom and dash