Barry,
I do understand that todays certs are different than long ago. I keep my ZW's for some of these operating reasons, in fact I just purchased another ZW from one of the OGR forum members. At any rate there is a problem of some kind, I also thought it might be with the TIU at 1st, however all my P2 engines run perfectly with both my TIU's so we are back to the P3 engines once again, being the problem. On the other hand, I really like the P3 engines, especially with the built in BCR, great engineering, upgrade. I still do not own any, because of the problems however. All my P2 stuff runs great, especially after replacing the batteries, with BCR's when they start to have problems.
PCRR/Dave