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 Post subject: Adjusting idle speed
PostPosted: Mon Apr 02, 2007 7:19 pm 
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Anyone know how I can raise my idle a couple hundred RPM? Its idling around 500-600 right now and I want it a little higher.



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PostPosted: Mon Apr 02, 2007 8:36 pm 
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I thought it was done automatically by the ECM and not adjustable...



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PostPosted: Mon Apr 02, 2007 9:12 pm 
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yeah, it isnt adjustable. Why do you want to change it?



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PostPosted: Mon Apr 02, 2007 9:59 pm 
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Damn. I have a humm from the motor that only happens when my car idles low. When I barely rest my foot ont he pedal and it raises the RPMs to around 750ish, the hum goes away.



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PostPosted: Mon Apr 02, 2007 11:07 pm 
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It is adjustable.
You have to have a dealership use the Subaru Select Monitor - they can set upper and lower idle limits.

I did this on my 99 Impreza once, it was idling at 600 so I had it raised to 700.



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 Post subject:
PostPosted: Mon Apr 02, 2007 11:15 pm 
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you can also set the idle screw so the throttle is always a little [more] open. Subaru says not to do this, but i do it to crank the idle to teach ppl to drive stick. Just mark the factory position with a paint pen.



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PostPosted: Mon Apr 09, 2007 10:09 pm 
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I found this
http://www.northursalia.com/techdocs/pd ... rottle.pdf

so yeah, no touchy screwy



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PostPosted: Tue Apr 10, 2007 12:26 pm 
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Khanhfucious wrote:
Damn. I have a humm from the motor that only happens when my car idles low. When I barely rest my foot ont he pedal and it raises the RPMs to around 750ish, the hum goes away.


You have any sort of intake mod?



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 Post subject:
PostPosted: Wed Apr 11, 2007 11:57 am 
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I have the hum whether my intake is on or off



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 Post subject:
PostPosted: Fri Apr 13, 2007 2:01 pm 
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scottzg wrote:
you can also set the idle screw so the throttle is always a little [more] open. Subaru says not to do this, but i do it to crank the idle to teach ppl to drive stick. Just mark the factory position with a paint pen.


I use this screw too, no problems. If you change the idle by a lot, you can potentially skew the TPS's reading (it will think your throttle is like 0.5% open when the car is idling). To fix this you have to loosen your TPS and adjust that a little too.

Messing with the idle can be a real pain, though, because the ECU and the IAC does compensate for anything you do with that screw. So you can successfully raise the idle speed to 750, but then you shut the car off and the next time you start it up it will compensate and be back down to 600 again, I found, so you might be fighting a losing fight with the ECU with this whole process.



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 Post subject:
PostPosted: Fri Apr 13, 2007 2:46 pm 
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jey wrote:
scottzg wrote:
you can also set the idle screw so the throttle is always a little [more] open. Subaru says not to do this, but i do it to crank the idle to teach ppl to drive stick. Just mark the factory position with a paint pen.


I use this screw too, no problems. If you change the idle by a lot, you can potentially skew the TPS's reading (it will think your throttle is like 0.5% open when the car is idling). To fix this you have to loosen your TPS and adjust that a little too.

Messing with the idle can be a real pain, though, because the ECU and the IAC does compensate for anything you do with that screw. So you can successfully raise the idle speed to 750, but then you shut the car off and the next time you start it up it will compensate and be back down to 600 again, I found, so you might be fighting a losing fight with the ECU with this whole process.


that's exactly why the throttle plate stop is factory set and should not be changed. the ECU sets target idle and will try to compensate until it can achieve it.



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