Put new battery in and now it idles poorly

[325YOY]

I just reconnected the battery in my '89 325i manual and now it idles rough and very low. When it comes to a stop it wants do die but seeks a bumpy but level 600 rpm. It ran perfect before I disconnected the battery a hour ago. Any ideas? TIA

[Alkasquawlik]

The ECU needs time to relearn.
It will sort itself out.

[325YOY]

The ECU needs time to relearn.
It will sort itself out.

I had this happen to one of my Audi's and it took a few minutes. What should I expect with the E30? Thanks for the response (and relief).

[Alkasquawlik]

I had this happen to one of my Audi's and it took a few minutes. What should I expect with the E30? Thanks for the response (and relief).

It should be fine within the next day or so. I just pulled my battery to install my HIDs and it idled rough for the rest of the day, but the next morning it was back to normal.

[thedeal]

I've pulled and replaced my battery plenty of times and never had this happen!

[kenika65]

^ you must have installed the battery quickly to prevent the internal memory battery's from dieing...

[payney8]

Yup. Also i believe its around 150kms whatever that is in miles.

[325YOY]

Ironed itself out on its' own today. Thanks for the input from all of you. On the good side though, I'm willing to bet I blew all the carbon off the plugs.:D

[dashboardmonkey]

my 88 sits in the driveway with the battery disconnected. I start it once every couple weeks and it idles just fine........interesting

[SIR E30]

That would explain my problem.. thanks :D