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Khanhfucious
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Post subject: Adjusting idle speed  Posted: Mon Apr 02, 2007 7:19 pm |
| "Proby" |
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Joined: Fri Jan 19, 2007 3:30 pm
Posts: 230
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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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vision.dynamix Headlight Services
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studum
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Post subject: Posted: Mon Apr 02, 2007 8:36 pm |
| SLi nOOb |
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Joined: Thu Jan 18, 2007 4:04 pm
Posts: 131
Location: Cambridge, Ontario, Canada
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I thought it was done automatically by the ECM and not adjustable...
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Ryan - 2000 LGT Limited - Swapped to 5spd
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shazapple
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Post subject: Posted: Mon Apr 02, 2007 9:12 pm |
| SLi O.G. |
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Joined: Thu Apr 14, 2005 10:25 am
Posts: 2114
Location: Eastern Canada
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yeah, it isnt adjustable. Why do you want to change it?
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Lee - Misc Moderator
1998 Subaru Legacy L
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Khanhfucious
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Post subject: Posted: Mon Apr 02, 2007 9:59 pm |
| "Proby" |
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Joined: Fri Jan 19, 2007 3:30 pm
Posts: 230
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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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vision.dynamix Headlight Services
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Huffer
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Post subject: Posted: Mon Apr 02, 2007 11:07 pm |
| Admin |
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Joined: Wed Sep 07, 2005 11:41 am
Posts: 15486
Location: Eastlake, OH / Wellington, NZ
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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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My signature is now a shout-out to the SLi veterans who keep this site flowing with good knowledge and informative opinion. You KNOW who you are, so keep it up!
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scottzg
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Post subject: Posted: Mon Apr 02, 2007 11:15 pm |
Joined: Thu Jun 23, 2005 5:14 pm
Posts: 742
Location: San Jose, "The Capital of Silicon Valley"
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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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1990 subaru legacy- i miss you!
1999 outback 30th deluxe deluxe megafantastic orgasmmobile
subaru has more R&D money than the aftermarket.
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Wiscon_Mark
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Post subject: Posted: Tue Apr 10, 2007 12:26 pm |
| t3h ch33se |
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Joined: Tue May 03, 2005 8:10 pm
Posts: 12578
Location: Stevens Point, WI
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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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~Mark
2003 Subaru Forester X 5MT 245,xxx miles
1995 LEGACY OUTBACK 5MT (SOLD)
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jey
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Post subject: Posted: Fri Apr 13, 2007 2:01 pm |
| SLi Supporter! |
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Joined: Thu Apr 14, 2005 9:44 am
Posts: 1812
Location: Texas
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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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- Jey
1995 Legacy Wagon EJ257 turbo
2011 Tribeca Limited EZ36
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SammyDaFish
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Post subject: Posted: Fri Apr 13, 2007 2:46 pm |
Joined: Thu Jul 20, 2006 7:44 am
Posts: 161
Location: Woodstock, NY
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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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- Juinior
www.trdsupra.com
1995 Legacy L Wagon - WRX suspension, STi exhaust, lowered, whiteline rear sway, greddy emanage, DIS-2 and a crazy turbo motor that's been sitting on an engine stand for a year waiting to go in
1998 Jaguar XJR
1996 Audi A4 Quattro with a long list of very custom mods
1989 Toyota Supra Turbo - Twin Turbo 7M (the long haul project)
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