dek0026

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

gizmotoy

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.

dek0026

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?

rcheung

iTrader: (15)

dek0026

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.

scottatyamaha

iTrader: (21)

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

dek0026

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

cfdfireman1

iTrader: (11)

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

dek0026

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.

cfdfireman1

iTrader: (11)

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

heel2toe

iTrader: (41)

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?

Papi4baby

iTrader: (1)

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.

dek0026

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.

cfdfireman1

iTrader: (11)

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

dek0026

really. i can believe that.