Welcome to the North American Subaru Impreza Owners Club Saturday July 22, 2017
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
Go Back   NASIOC > NASIOC Technical > Normally Aspirated Powertrain

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.
* Registered users of the site do not see these ads. 
Thread Tools Display Modes
Prev Previous Post   Next Post Next
Old 07-21-2003, 12:09 PM   #1
Scooby Guru
Member#: 935
Join Date: Feb 2000
Chapter/Region: MWSOC
Location: ಠ_ಠ
Tony Mason Fan Club

Default Idle Air Controller

I ran a search but couldn't find the info I was looking for. Can anyone help me deduce this problem?

My car had a rough idle; cylinders misfiring, engine shaking, the works. It also affected the car when in gear at low RPMs; it would hesitate, not responding to the accelerator until it was past halfway then surging to the power it should be providing at that level of throttle. It would not do this when revving out of gear.

Anyway, I was directed to several areas. Spark plugs and wires are both less than a year and ten thousand miles old. I checked them and everything was tight. I have also been told the forward Oxygen sensor may be at fault, but further investigation has led me away from that.

I was also directed to the Idle air controller. I pulled it off and cleaned it with a rag (it was black and filthy), and also cleaned out the hole into which the sensor goes. It had no effect for about half an hour of driving, but after a while there was no hesitation when starting in gear, and the engine idled better, though not as smooth as it used to.

This weekend the problem returned. Same rough misfiring idle, same hesitation starting in gear. To test the success of cleaning the controller, I cleaned it again (it had almost nothing on it), and the same thing happened, a half hour later it was almost back to normal.

What I want to know is, is this a sign the idle air controller is the culpret, or is there something else that I'm affecting when I clean it? I'm trying to get hold of an idle air controller to test locally, but I also wanted to see if anyone may have a diagnosis I haven't considered.

Yotsuya is offline   Reply With Quote

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Idle Air Control Valve: Anyone had this replaced? IceClimber Service & Maintenance 7 04-04-2015 05:33 PM
IDLE AIR CONTROL for '02 WRX WRX-Mike110 Private 'Wanted' Classifieds 0 01-03-2004 04:59 AM
WRX Idle/Air control valve djerickd Private 'Wanted' Classifieds 11 12-02-2003 11:37 AM
Idle Air Controller SubaruImpreza_power Normally Aspirated Powertrain 3 09-19-2003 02:04 PM
idle air control valve, after a turbo mod mild_se7en Normally Aspirated with bolt-on Forced Induction Powertrain 1 08-10-2002 07:45 AM

All times are GMT -4. The time now is 09:32 AM.

Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2017 Axivo Inc.
Copyright ©1999 - 2017, North American Subaru Impreza Owners Club, Inc.