Engine rattle during acceleration
We have noticed a strange engine area rattle when the van is accelerating (04 Freestar with 4.2L). Only happens during fairly hard acceleration between 3500 and 5000rpm. It sounds like something is loose. If it was an old car I would be worried about detonation, but I think that would cause an engine warning light, plus I just replaced all the ignition components. Yes it occurred before the tuneup.
I almost wonder if there isn't a dustcover loose on the transmission because I don't remember this noise prior to getting the transmission replaced. Is there something on the transmission that would rattle under high(ish) rpms?