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Old 03-19-2006, 02:05 PM   #1
Scooby Newbie
Member#: 44482
Join Date: Sep 2003
Location: Durham Region, Ontario CANADA
2004 Impreza 2.5TS
& 2007 Spec.B

Default fast idle problem - need advice please

I'm new to Subarus and would appreciate any help available from those more knowledgable... thanks

2004 Impreza TS2.5 wagon. No mods. 61k km (40k miles)

At cold start, fast idle ranges between 1700 & 2000 RPM. When driving away cold, fast idle increases. With each upshift, idle will remain high, even 2-3k RPM and very slowly drop to about 1800 RPM if the clutch is kept depressed.

After engine warms up to operating temps, idle remains fast for another 20 minutes or so of driving time.

Dealer has been unable to resolve (normally very good dealer service)
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Old 03-19-2006, 04:44 PM   #2
Scooby Newbie
Member#: 90249
Join Date: Jun 2005
Chapter/Region: RMIC
Location: Denver, CO
2006 WRX Ltd.


Inherent problem with the throttle on our cars. Subaru NA is working on a fix right now for mine. Take a look at my other threads- hope it helps.

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Old 03-20-2006, 01:10 AM   #3
Scooby Newbie
Member#: 109729
Join Date: Mar 2006
Chapter/Region: SCIC
Location: Santa Ana, CA
2007 GTI
Reflex Silver


i have the exact same issue in my '06 wrx wagon.

and i thought i was going crazy
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Old 03-20-2006, 05:26 AM   #4
Scooby Specialist
Member#: 62410
Join Date: May 2004
Chapter/Region: AKIC
Location: its bristol baby
2004 wrx w/o engine


the 04 isn't drive by wire, so in your case check the center wire of the tps sensor and make sure it's .5 volts closed throttle, if it's not adjust it, then reset the ecu. this can cause wierd idle on n/a cars. so can a bad coolant temp sensor, but that usually sets a code.
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Old 03-20-2006, 09:37 AM   #5
Scooby Specialist
Member#: 39514
Join Date: Jul 2003
Chapter/Region: SWIC
Location: Avondale, AZ
2003 WRX 2.5L Hybrid
Mostly Blue


Loosen the cable that routes to the Cruise control box. It is down near the turbo. I loosened mine to have 1/4 inch play in the cable and the issue you described above went away.
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