WooglinsAudi

Recently my heater core hose sprung a leak in my 1996 a4 2.8 manual. About 3 days later the leak got bad enough that my coolant level indicator came on. I fixed the leak and refilled the system. There was a bunch of antifreeze stuck in the bottom of the battery compartment. Now three days later the car is idiling really rough after its warm and hesitates on take off. It also blows a bunch of white smoke out of the tail pipe. Could the antifreeze have messed up the electronics? Any idea what it could be? Also, the smoke coming out is white and smells like gas and water, not antifreeze.

AudiMick

If you disconnected the battery all of the learned setup info was lost . So it's running on the default MAP. It will take a few days for the computer to relearn the correct settings. Often it will run rough especially on idle. It takes multiple full cycles to do this. Short trips where the motor doesn't warm up don't set the READY flag.

Check to see if you have "pending" codes using your vag.com. The CPU is not close to the battery so coolant should not have damaged it.

Steam is normal, probably running rich.