Bad idle since battery change

magenb · Postby **magenb** » Fri Aug 22, 2014 9:18 am

Hi Everyone,

I had a dead battery last night and nrma came out and replaced it, but no I seem to have a problem with idle. When coming to a stop it take a couple of second for it to rest at idle. It will continue to try to find idle in the same manner if you just let the car roll out of gear for as long as you are rolling, but setting on idle once stopped.

06 NC.

Any ideas?

93_Clubman · Postby **93_Clubman** » Fri Aug 22, 2014 11:02 am

If the NC ECU is anything like NA & NB ECU, then after being depowered the ECU needs to do a bit of relearning, ie it needs to be dríven to encounter differing speeds & conditions - should sort itself out over a day or so depending on how much it's dríven.

Regie · Postby **Regie** » Fri Aug 22, 2014 9:36 pm

yep, i had my battery out the other day.

Same problem as yours, I've done about 60kms since and its just about sorted itself out.

Its normal

magenb · Postby **magenb** » Tue Aug 26, 2014 1:44 pm

Ok seems to be settling down, but only after 300km..

JayMo · Postby **JayMo** » Wed Sep 03, 2014 9:57 pm

Howdy

Check your MAF... this may or may not be your problem, but in my car, the MAF was dirty, but the computer learned around it... unplug the battery to work on the stereo, crap idle, computer works around it and eventually settles it... unplug the battery to work on the stereo again, crap idle! and repeat!

Worked out the previous owner put in an oiled filter which is not the best in an NC, so i now do the MAF every second (10k) service. I got a slight improvement in economy and get to unplug the battery and play with the stereo whenever I want