HomeForumsTechnical – GeneralEngine355 irregular idle

This topic contains 10 replies, has 5 voices, and was last updated by Profile photo of Slow355 Slow355 9 years, 6 months ago.

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  • #4858
    Profile photo of Slow355
    Slow355
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    Member since: March 2, 2015
    Posts: 322

    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

    #4859
    Profile photo of NickVR
    NickVR
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    Member since: March 2, 2015
    Posts: 264
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    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.

    • This reply was modified 9 years, 6 months ago by Profile photo of NickVR NickVR.
    • This reply was modified 9 years, 6 months ago by Profile photo of NickVR NickVR.
    #4864
    Profile photo of Slow355
    Slow355
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    Member since: March 2, 2015
    Posts: 322

    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

    #4866
    Profile photo of VRSenator065
    VRSenator065
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    • Adelaide SA
    • VR Senator LSx454 1960 Kombi (project) 1921 Nash Hot Rod (future project)

    • View build HERE
    Member since: February 17, 2015
    Posts: 5 777
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    ^^great info Nick, is that for all injected Holdens?

    #4869
    Profile photo of ACE PERFORMANCE TUNING
    ACE PERFORMANCE TUNING
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    Member since: March 14, 2015
    Posts: 48
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    Yes 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.

     

    #4875
    Profile photo of Slow355
    Slow355
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    Member since: March 2, 2015
    Posts: 322

    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

    #4878
    Profile photo of VRSenator065
    VRSenator065
    Participant
    • Adelaide SA
    • VR Senator LSx454 1960 Kombi (project) 1921 Nash Hot Rod (future project)

    • View build HERE
    Member since: February 17, 2015
    Posts: 5 777
    Supporter

    No car ever has enough power, no matter what the upgrade 2 weeks later it feels slow…

    #4904
    Profile photo of Slow355
    Slow355
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    Member since: March 2, 2015
    Posts: 322

    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

    #4909
    Profile photo of NickVR
    NickVR
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    Member since: March 2, 2015
    Posts: 264
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    Yes 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.

    #4915
    Profile photo of cava454
    cava454
    Moderator
    Member since: February 20, 2015
    Posts: 2 390
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    Only thing irregular is that plenum.

    #4992
    Profile photo of Slow355
    Slow355
    Participant
    Member since: March 2, 2015
    Posts: 322

    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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