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 Post subject: disable rolling idle up?
PostPosted: Thu Mar 14, 2013 7:06 pm 
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Joined: Mon Mar 24, 2008 7:47 am
Posts: 124
so as we all know any time the vehicle is moving and throttle position is at idle the ECM idles the engine up to around 2k rpm using the IAC to 'make shifting easier'.

Is there a way to defeat this 'feature'? Its damn annoying in my book. I know I know: disconnect the IAC. I don't like that option because I have a 3tech cam, +8 etc and having the idle up for the electrical load while driving at night is kinda nice.

I looked at the diagram for the IAC controller box hoping VSS would be listed as an input but its not. I searched on here a bit and the only mention I found is that it may be a diode type deal in the gauge cluster.

Thoughts?


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PostPosted: Fri Mar 15, 2013 8:39 am 
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Joined: Mon Mar 24, 2008 7:47 am
Posts: 124
no takers?

Here is what I'm thinking I'm going to try...

According to http://www.teamswift.net/Lihtan/metro/6E2-A-3.png

the idle switch from the TPS is pin B7 and has +5v when in the idle position
the VSS on the back of the instrument panel is pin B15 and is grounded at zero mph

if cut the VSS (B15) and replace it with a relay that goes to ground and is triggered by tapping the idle switch I should be good to go.


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PostPosted: Wed Mar 20, 2013 4:40 pm 
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Joined: Mon Mar 24, 2008 7:47 am
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upon further research, I'm going to have to do something like this:

http://jumperone.com/2011/10/using-relays/

not too bad, just another hoop.


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PostPosted: Wed Mar 20, 2013 4:54 pm 
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My 92 geo vert doenot have it never did.Do you want a picture.?
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PostPosted: Wed Mar 20, 2013 8:49 pm 
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Joined: Tue Oct 24, 2006 3:09 pm
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Location: Palm Springs: Too hot from June to Oct.!
We have a similar system on our '85-'88 cars and it uses the IUA.
If you don't believe me, when you hit the brakes on an MK1 at idle, the brake lights come on and the idle jumps up 50 rpms.
The same thing happens when your headlights, heater/radiator fan, VSS signal kicks in, or an electric load is sensed.

2000 rpms sounds about right. Maybe there is a problem with the speed sensor? :shock:
Our SOHC had a problem similar and we traced it to transmission oil heading up the speedo cable and dousing the VSS with oil.
You have oil under the dash?
There are lots of threads explaining how to fix it.
Give it a good check.

I believe there is a timer inside the ECM which you will have to take into consideration if you attempt to defeat it.

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