Originally Posted by fuelsipper
So is it conclusive that the early ECM's get better fuel mileage? Or is it to do with the life of the IMA battery?
personaly, I beleive its a combination, old ecm, mcm, bcm. I know first hand the old ecm and mcm do not like the new(er) bcm. keeping my car in lean burn, out of assist, and the batt topped off is a nightmare sence I replaced the bcm with the new one. Even when my old pack was dead (yes, it was dead, wouldnt accept any form of charge) i was able to lean burn very easy, I had power (ic engine), and my MIL rarely came on-over night the car declined-