[V8] narrowing down the cause of tranny limp home mode

[z1sales at z1auto.com]

The other night we drained the tranny fluid and refilled it with 4 quarts per the lists
recommendations.  What I now notice is that when the car is cold, it seems to shift at least 1-2-3
without issue.  It will also downshift into a gear if you press hard enough on the accelerator
(something it does not do when it goes into limp mode).  After you drive it for a few miles, it
goes into limp mode.  If you shut the car off and restart, sometimes it will go back to shifting
ok, sometimes it won't (I assume a hard code vs a soft code).

If it is of any importance, when it does shift, it shifts fine - very smooth, very quick.  This is
the same with up and downshifts.

Today I tried to pull the main ecu as well as  the tranny ecu in a hope to reset any hard codes,
but within a few miles of leaving the office, the limp mode came back.  It shifted ok for the few
couple miles, stopped for a red light, and immediately upon accelerating again, the limp mode was
back.

Any further insight into what this might be?  Any reason it would shift 1-2-3 but not 4? 
Thanks guys!

Adam
Z1 Performance
www.z1auto.com
631-863-3820




Adam
Z1 Performance
www.z1auto.com
631-863-3820