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put the powerFC back in and it no longer blows that fuse, car started a bit rough first time nfi whats going on unless its a stuffed stock ecu

Yep, my original ecu

Yep disconnected battery first, I'll try the powerfc again

stock AFM - sorry I forgot to mention, its a S2 r33 gtst any ideas what that fuse actually hooks up with so I can check it? The climate control unit comes on when switched to ACC and when i press A/C I can hear the relay in the engine compartment click but nothing else happens. Hard to imagine anything wouldve fried when all that changed was the ecu

Hey guys Took out the powerFC I had in the car and put the stock ECU back in. Car started for about 1 second and then stopped. When I tried to start it again it cranks but doesn't fire up. I had a look in the fuse box under the dash and the "aircon" (エアコン) 10A fuse was blown, I replaced this, tried to start and the same thing happened - it started for 1-2 seconds then died, after that it sounds like it is turning over but wont start up. No other fuses I can see are blown at all. Only mods are the pod filter and FMIC, nothing else has changed except for me taking the powerfc out and putting the stock ecu back.