Since we are looking for something obscure here I would check the voltage to the fuel injectors. Low voltage would make for a lean mixture. Other items are:
-------------- Original message --------------
From: "Russell Duffy" <russell.duffy@gmail.com>
It may be something simpler; but the only thought I come up with so far is the mixture mapping was somehow corrupted. I’ll know more when I get out there and view the mixture mapping on the EM2.
Hi Al,
Did you try both controllers? If it got corrupted, hopefully it wouldn't be both controllers at the same time. I'm pretty sure you can't view the map for the B controller with the EM2, but looking at the A map will certainly tell you something, particularly if you have any notes about how it was set before.
As for being too lean, that's usually an air leak I would thing. Someone else mentioned vacuum lines. Are there any hoses you re-worked, or other potential vacuum leaks?
Good luck,
Rusty (Aerosport O-360 being delivered today)