This topic contains 10 replies, has 5 voices, and was last updated by 
Slow355 9 years, 7 months ago.
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So after respraying my car, once driving again i have noticed that it cant hold an idle. It idles fine once started but once u drive and slow to a stop idle gets a real camy kinda feel happening. Will drop to 200 then dart to 1200. Kinda have to ride the loud pedal to hold it at normal idle. Once this is done it will steady idle.
I will replace filter as the k and n getting old and have a feeling dirty filter played havoc with idle a while ago. Should note that batterie went flat several times during respray.
I have been told that the iac needs to learn how it should act. There is a way of resetting it and reteaching it? Have driven for few months now, sometimes its good and sometimes its horrible.
Has no engine lights or fault codes.
munch munch ls1s for lunch
Best 1/4 mile 13.1@105mph 60ft-1.8sec Reaction time .8 sec 0/100-4.8sec
NickVR
- Adelaide
- VR V8 Exec, VR SS, VF Redline Reserve
View build HERE
Posts: 264
I have to do this IAC relearn procedure when my battery goes flat.
1 Disconnect the battery (about 10mins should do)
2 Reconnect when time has passed.
3 Start the car and instantly rev the car to 3k or around that doesn’t need to be exact. (hold throttle down a bit when starting if you want)
4 Hold it there until you hear the car change the revs by itself.
5 Keep your foot steady until it’s finished and the revs are maintained.
6 Release the accelerator
7 Then put your foot on the brake and put it into reverse. Let it learn the idle (a few seconds should do it)
8 Then with your foot still on the brake put it into drive. Let it learn the idle (a few seconds should do it)
9 Shift back into park.
10 Then put the A/C on. Let it learn the idle (a few seconds should do it)This will complete the idle relearn procedure. Steps 7-10 can be done when you drive it next but I do it straight away because sometimes it won’t learn during a drive.
Thanks mate I’ll try onc home!!!
munch munch ls1s for lunch
Best 1/4 mile 13.1@105mph 60ft-1.8sec Reaction time .8 sec 0/100-4.8sec
VRSenator065
- Adelaide SA
- VR Senator LSx454 1960 Kombi (project) 1921 Nash Hot Rod (future project)
View build HERE
Posts: 5 777^^great info Nick, is that for all injected Holdens?
ACE PERFORMANCE TUNING
- PENRITH
- L98 VX SS ON NITROUS AND VS 304
View build HERE
Posts: 48Yes same for all delco ecu’s vn-vt. Idle reset threshold is 2000rpm so bit over for 5 sec.
Battery just needs disconnecting and that will reset the ecu ,10 min does nothing
except waste time.
Pretty much as above go all through the gears then go for a drive so it
re learns everything.
If that doesn’t fix your issue then you have other problems.
It’s a holden, always other problems. Like not enough powa waaaaaa
munch munch ls1s for lunch
Best 1/4 mile 13.1@105mph 60ft-1.8sec Reaction time .8 sec 0/100-4.8sec
VRSenator065
- Adelaide SA
- VR Senator LSx454 1960 Kombi (project) 1921 Nash Hot Rod (future project)
View build HERE
Posts: 5 777No car ever has enough power, no matter what the upgrade 2 weeks later it feels slow…
Tip of the hat to nick n Ace, worked a treat purs like a kitten once again. Not stalling at lights with worlds camiest idle!!
Now if i can find some devonish seats, bigger cam n stainless zaust my problems would be solved
munch munch ls1s for lunch
Best 1/4 mile 13.1@105mph 60ft-1.8sec Reaction time .8 sec 0/100-4.8sec
NickVR
- Adelaide
- VR V8 Exec, VR SS, VF Redline Reserve
View build HERE
Posts: 264Yes same for all delco ecu’s vn-vt. Idle reset threshold is 2000rpm so bit over for 5 sec.
Battery just needs disconnecting and that will reset the ecu ,10 min does nothing
except waste time.
Pretty much as above go all through the gears then go for a drive so it
re learns everything.
If that doesn’t fix your issue then you have other problems.
Wasn’t sure on the time thing. Thought the ecu might hold power in some way. Didn’t realise that it would reset instantly.
Only thing irregular is that plenum.
Lol Cav was waiting for a coment like that!
munch munch ls1s for lunch
Best 1/4 mile 13.1@105mph 60ft-1.8sec Reaction time .8 sec 0/100-4.8sec
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