MAF conversion on AOD-to-T5 swapped car...A9L or A9P

Hmm never heard if this. when I did my aod swap I left my A9P in and I have never had any issues, my buddy put a A9L into his after his swap w/o issues other than he didn't really notice that much if any difference over the P. Most of the stuff I have read on conversions is they use the '89 harness and the A9P with success and most seem to like the A9P. I thought about getting the A9L until after my buddy swapped his + I did some reading and found the A9L has good spark & injector maps so I left things alone. Sounds like if you get the "P" you shouldn't have any issues although this is a new one to me .

Using a manual ECM in an Auto setup and it frying is a Reality

The problem is the difference in the harnesses and a mis match of the SIGRTN for the NGS for a T-5 and the NSS for the AOD. Start voltage is routed through the NSS in Auto setups and not in Manual setup. This is were the Frying happens, as the SIGRTN is a sourced ground and a 12 blast will fry it and cause holly hell in the ECM when a A9L is used in an Auto setup.

The O2 harness plugs into a 8 PIN black connector on the passenger side fenderwell. In that connector is a PIN for the NDS circuit, a PIN for Auto and a PIN for Manual. On the Auto 02 harness the NDS is connected to the Auto PIN and in Manual 02 harness the NDS PIN is connected to the Manul PIN. You should be able to switch the NDS from Auto to Manual and Be Fine......Hope this Helps..

Also this is what i was told.

a9l final timming 27.5deg
a9p final timming 30deg

i left my a9p intact when i did my 5sp swap over 8 yrs ago and i have had zero issues.

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You can use the A9P in an auto or manual setup, just can't use the A9L in an auto setup with out making the proper changes to the Harness.