Hey there,
Upon return of a cross country trip, my Supra gained a few problems. Whole trip was fine even though from day one tuner complained about voltage. Towards the end of the trip after a rain storm and colder weather, i noticed the car would run rich at cold start. Its ran like this ever since. Almost sounds cammed or rotary till it warms up. Ive connected the laptop to run logs and with key on, cranking, and running it seems to disconnect during cranking. Ive cleaned the IAC since I went through a ton of weather, didnt help. Noticed a ground wire chassis to engine was loose. That fixed the disconnecting when cranking issue but still runs funny on cold start. Voltage reads 13.6 at battery and fuse box but 12.9 at ecu when running and no accessories on. Do you recommend another ground? Back probe anything? Relay? Anything else?
Car is 95 Supra, Aristo non vvti 2jzgte, G4+ pnp
Thank you!