So my LED on the stock head unit bugged out on me and froze when trying to change the time for day light savings time. i disconnected the negative battery cable and get the time set fine. Now! the car won't idle at lights. It just revs from 0 rpms to 800 rpms and then craps out. i have a hesitation (big time) at high rpms.

i can't drive to work today in traffic. i am bringing it to the dealer today to see if i can get flashed again. ridiculous!!

thanks for responding to the attention-getting title

 

I don't even think that's possible. When it gets flashed, it overwrites what was previously there. You have some other pretty serious problem.

 

yeah i don't know what it could be. i don't drive it hard. all i did was unhook the battery cable and now it is all weird.

anybody have any input?

 

 

edited.

talked to the service department and was told that it never relearned the idle and they will have to manually do it. so rcheung you were right. apparently ECUs own me.

 

Correct it would take my EVO 8 sometime also to relearn the idle if I ever disconnected my battery.

 

should i even bother going to the dealer or just give it time to relearn?

 

no, just let it idle that's all the dealer is going to do. 10 min will do it.

 

i let it idle for about 10 minutes but that didn't quite do it. i drove it around a lot and the idling is getting better and better. just stalled a few times and looked stupid.

so this is a lesson to a noob when disconnecting the battery.

 

It takes 10 minutes or so after the car is warmed up.

 

I know it takes time for the ecu to relearn how the car idles and that is probably the issure however is there any chance that you have a loose connection at the neg battery terminal?

 

If it really did loose it, you might have a bad ECU, the maps are saved to memory chips that wont forget the information if they loose power.

 

after letting it idle for 10 minutes and driving it around in city-like driving with lots of opportunities to idle, it was still acting funny when i got home to put it away. today when i started it and went to work, it runs absolutely fine.

i am sure many are rolling their eyes at this thread but it is a lesson learned. i never experienced that with any car i owned.

 

Now it has to learn how to idle with the AC on.

 

really. i can believe that.