Idle jumping high in stop n go traffic

ReDHaTyGuY · 01-19-2009, 08:18 PM

me and my Gf have a 03 wrx that she purchaced used with 80k on it .. im just getting around to asking this, this past summer when it was fairly hot out and we would be driving in stop n go traffic .. when we would come to a stop the car would idle really high like 3k.. if she would turn the car off and restart it it would idle fine untill we started driving again and came to another stop.. now it only did this when it was really hot out.. ive been searching for some answer's and have came across a few possiblities but im looking for some more input on this... the car is stock as far as i know with the exception of a AEM cold air intake... i was thinking maybe the iacv needs cleaned or something of that nature.. im going to be doing a 90k service here soon so i wanna try n fix this problem while im at it

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pro934 · 01-19-2009, 09:44 PM

I'd be willing to bet you are on the right track with the IACV. Hot weather tends to make your car run rich as well, the air is less dense than cold air. Maybe get your AFR's checked as well. You may have purchased a car that was returned back to stock and the previous owner still has a tune on it that is making you car act funny.

skimobile · 01-19-2009, 10:02 PM

IACV is good to clean out but I'll bet a paycheck that the problem you are referring to is the result of the Cruise Control cable pulling on the throttle body.
If you follow the cable to the firewall on the passenger side you'll see the black pastic box of the control unit. This unit distorts slightly under heat and pulls on the cruise contol cable, causing the problem you refer to.
The easy fix is to make sure you increase cable slack on the cruise control cable at the cable adjustment point on the throttle body. Again, that is the PASSENGER side cable on the top of the throttle body. Just loosen the jam nut, adjust the cable to increase slack and retighten the cable adjustment & jam nuts.
I had the same exact problem and it never returned after slack was added to the cable.

GUN-IT · 01-19-2009, 11:05 PM

Clean your MAF sensor with MAF sensor spray cleaner. It may be throwing your computer if it's too dirty and causing it to run rich...........

subeerex · 01-20-2009, 10:46 AM

MAF/IACV the most likely causes. These are sencitive buggers!

...they don't take much.

Subie Gal · 01-20-2009, 11:38 AM

Front 02 sensor beginning to fail will also cause these symptoms.

scooter4483 · 02-03-2009, 01:45 PM

Quote:

Originally Posted by skimobile

IACV is good to clean out but I'll bet a paycheck that the problem you are referring to is the result of the Cruise Control cable pulling on the throttle body.
If you follow the cable to the firewall on the passenger side you'll see the black pastic box of the control unit. This unit distorts slightly under heat and pulls on the cruise contol cable, causing the problem you refer to.
The easy fix is to make sure you increase cable slack on the cruise control cable at the cable adjustment point on the throttle body. Again, that is the PASSENGER side cable on the top of the throttle body. Just loosen the jam nut, adjust the cable to increase slack and retighten the cable adjustment & jam nuts.
I had the same exact problem and it never returned after slack was added to the cable.

i wanna try this first as i have the stop and go traffic idle go up to 2k rpms. how do i do this? any pictures?

WMCCook29 · 02-03-2009, 02:04 PM

Here's a photo of what you need to adjust (bottom right corner, the actual jam nut is just out of the picutre): http://69.213.167.230/tr/wrx/images/...L/P8160014.jpg

p2adan · 02-03-2009, 02:12 PM

When driving my 08 2.5i while slow rolling in 1st with the clutch in, it would rev the RPM's to about 2.5k. I think this was intentional so that when you engage the gears again there is less wear on the tranny/differentials. Correct me if I'm wrong, but it could be something else as well.

1sicWRX · 02-03-2009, 02:18 PM

Clean MAF, clean IACV, check functionality of the a/f ratio sensor(front 02) put stock air box back on...

dauss · 02-03-2009, 02:35 PM

Head to the dealer and get the recall fixed.

scooter4483 · 06-05-2009, 09:45 AM

how do u give the cable slack? based off the pic, what is the point of losenning that nut on that clamp? i read the recall is for when the cable in the lever gets loose not what i have going on.

01-19-2009, 08:18 PM	#1
ReDHaTyGuY Scooby Newbie Member#: 200618 Join Date: Jan 2009	Idle jumping high in stop n go traffic me and my Gf have a 03 wrx that she purchaced used with 80k on it .. im just getting around to asking this, this past summer when it was fairly hot out and we would be driving in stop n go traffic .. when we would come to a stop the car would idle really high like 3k.. if she would turn the car off and restart it it would idle fine untill we started driving again and came to another stop.. now it only did this when it was really hot out.. ive been searching for some answer's and have came across a few possiblities but im looking for some more input on this... the car is stock as far as i know with the exception of a AEM cold air intake... i was thinking maybe the iacv needs cleaned or something of that nature.. im going to be doing a 90k service here soon so i wanna try n fix this problem while im at it * Registered users of the site do not see these ads.

01-20-2009, 10:46 AM	#5
subeerex Scooby Specialist Member#: 87430 Join Date: May 2005 Chapter/Region: SCIC Location: iFontanaE Vehicle: 02/5 BugEye-Peanut Sedona Red Silver	MAF/IACV the most likely causes. These are sencitive buggers!...they don't take much.

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01-19-2009, 09:44 PM	#2
pro934 Scooby Specialist Member#: 169234 Join Date: Jan 2008 Chapter/Region: NWIC Location: Spanaway Vehicle: 2005 STI WRB Reffing the Kumite from the South	I'd be willing to bet you are on the right track with the IACV. Hot weather tends to make your car run rich as well, the air is less dense than cold air. Maybe get your AFR's checked as well. You may have purchased a car that was returned back to stock and the previous owner still has a tune on it that is making you car act funny.

01-19-2009, 10:02 PM	#3
skimobile Scooby Specialist Member#: 92114 Join Date: Jul 2005 Chapter/Region: NESIC Location: Westerly, RI Vehicle: 03 WRX Bugeye 2.61L Hybrid Track Toy	IACV is good to clean out but I'll bet a paycheck that the problem you are referring to is the result of the Cruise Control cable pulling on the throttle body. If you follow the cable to the firewall on the passenger side you'll see the black pastic box of the control unit. This unit distorts slightly under heat and pulls on the cruise contol cable, causing the problem you refer to. The easy fix is to make sure you increase cable slack on the cruise control cable at the cable adjustment point on the throttle body. Again, that is the PASSENGER side cable on the top of the throttle body. Just loosen the jam nut, adjust the cable to increase slack and retighten the cable adjustment & jam nuts. I had the same exact problem and it never returned after slack was added to the cable.

01-19-2009, 11:05 PM	#4
GUN-IT Scooby Newbie Member#: 199693 Join Date: Jan 2009 Chapter/Region: South East Location: Georgia Vehicle: 2005 STI Crystal Grey Metallic	Clean your MAF sensor with MAF sensor spray cleaner. It may be throwing your computer if it's too dirty and causing it to run rich...........

01-20-2009, 11:38 AM	#6
Subie Gal GC84Ever Super Moderator Member#: 301 Join Date: Sep 1999 Chapter/Region: NWIC Location: WA Vehicle: 2001 2.5 RS/70 Van 02 WRX Rally Stud	Front 02 sensor beginning to fail will also cause these symptoms.

02-03-2009, 02:04 PM	#8
WMCCook29 Scooby Specialist Member#: 152685 Join Date: Jun 2007 Chapter/Region: NESIC Location: Boston Vehicle: 2005 VF34 WRX Wagon WRB	Here's a photo of what you need to adjust (bottom right corner, the actual jam nut is just out of the picutre): http://69.213.167.230/tr/wrx/images/...L/P8160014.jpg

02-03-2009, 02:12 PM	#9
p2adan Scooby Newbie Member#: 176574 Join Date: Apr 2008 Chapter/Region: NWIC Location: Portland Vehicle: 2008 2.5i Black	When driving my 08 2.5i while slow rolling in 1st with the clutch in, it would rev the RPM's to about 2.5k. I think this was intentional so that when you engage the gears again there is less wear on the tranny/differentials. Correct me if I'm wrong, but it could be something else as well.

02-03-2009, 02:18 PM	#10
1sicWRX Scooby Specialist Member#: 104631 Join Date: Jan 2006 Location: NorCal Vehicle: 99 911 Carrera 03 Land Rover Disco SE7	Clean MAF, clean IACV, check functionality of the a/f ratio sensor(front 02) put stock air box back on...

02-03-2009, 02:35 PM	#11
dauss Scooby Specialist Member#: 108369 Join Date: Feb 2006 Chapter/Region: MAIC Location: Silver Spring, MD Vehicle: 2005 CGM WRX Wagon 68HTA	Head to the dealer and get the recall fixed.

06-05-2009, 09:45 AM	#12
scooter4483 Scooby Specialist Member#: 71834 Join Date: Oct 2004 Chapter/Region: MWSOC Location: western chicago suburb Vehicle: 2005 WRX w/ premium WR Blue	how do u give the cable slack? based off the pic, what is the point of losenning that nut on that clamp? i read the recall is for when the cable in the lever gets loose not what i have going on.