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 Post subject: yep. another idle thread.....
PostPosted: Wed Sep 30, 2015 8:12 am 
First Gear
Joined: Wed Oct 24, 2012 6:30 pm
Posts: 218
My 93 2.2 na-t a/t is having idle issues. After sitting 2 months the iac must have been stuck. Out of desperation.. i adjusted the throttle stop screw. (Idiot move) i cleaned the iac and set the screw back to where i thought it was... now the car either idles high like 1500 or too low like almost stalling on pedal lift. Low enough for the torque convertor to stall. How can i reset things back to normal. The only time it idles properly is in park. If it idles too high or too low i put it in park and it settles where it should.


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 Post subject: Re: yep. another idle thread.....
PostPosted: Thu Oct 01, 2015 8:47 pm 
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So you adjusted the idle stop screw on the throttle body? If so the TPS is likely out of adjustment which has the idle switch in it. You can try adjusting the TPS's idle switch per the third scan in the TPS set, but I've known people to just replace the throttle body with one that has not been adjusted.

http://main.experiencetherave.com/subar ... sting1.jpg
http://main.experiencetherave.com/subar ... sting2.jpg
http://main.experiencetherave.com/subar ... sting3.jpg

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 Post subject: Re: yep. another idle thread.....
PostPosted: Fri Oct 16, 2015 11:21 pm 
First Gear
Joined: Wed Oct 24, 2012 6:30 pm
Posts: 218
Thanks! my tps was never ever touched, and worked perfect prior to me touching the screw, so i adjusted the screw so 0.030 was the idle switch on /off point. worked like a charm. thanks


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 Post subject: Re: yep. another idle thread.....
PostPosted: Thu Nov 12, 2015 6:47 am 
First Gear
Joined: Wed Oct 24, 2012 6:30 pm
Posts: 218
More problems. Intermittent super lean idle. When lean vacuum goes to -15hg. Normally 19-20hg @ idle. Leans out so bud it will misfire. If i blip the throttle it will go way rich. And sweep back and forth rich lean rick lean and settle super lean. And other times perfect idle -19 to -20 vacuum and ideal afr at idle. Time for a new iac? Ive cleaned it several times now


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 Post subject: Re: yep. another idle thread.....
PostPosted: Fri Nov 13, 2015 7:35 pm 
Second Gear
Joined: Fri Jul 09, 2010 1:41 am
Posts: 353
Location: Bend, Oregon
or at least a known good one from the parts section. they are pretty expensive new. pulling one from a wrecking yard has more often then not yielded IAC's that were no better if not worse then the original. Ebay has loads of used ones in the 60-80 range which is still pretty steep considering you still don't know if it will work for sure.

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 Post subject: Re: yep. another idle thread.....
PostPosted: Fri Nov 13, 2015 7:39 pm 
First Gear
Joined: Wed Oct 24, 2012 6:30 pm
Posts: 218
TurnNburn wrote:
or at least a known good one from the parts section. they are pretty expensive new. pulling one from a wrecking yard has more often then not yielded IAC's that were no better if not worse then the original. Ebay has loads of used ones in the 60-80 range which is still pretty steep considering you still don't know if it will work for sure.

I bought a new subaru one. I noticed the little slider piece that opens and closes has like a green plastic coating on it, the original when it was off was shiny metal . friggen spendy!!!!!


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 Post subject: Re: yep. another idle thread.....
PostPosted: Wed Nov 18, 2015 9:34 am 
First Gear
Joined: Wed Oct 24, 2012 6:30 pm
Posts: 218
Still battling crap running.....i took a vid Image


It will idle up then idle down when it idles up vacuum is a bit higher when it idles down vacuum drops and goes pretty lean. Not sure what to think. This was right after iac replacement with oem new iac and ecu reset


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 Post subject: Re: yep. another idle thread.....
PostPosted: Sat Nov 21, 2015 5:55 am 
Fifth Gear
Joined: Fri Jun 20, 2008 8:17 am
Posts: 6192
Location: Lakewood, Wa 98439
Did you calibrate the iac correctly?

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 Post subject: Re: yep. another idle thread.....
PostPosted: Sat Nov 21, 2015 7:32 pm 
First Gear
Joined: Wed Oct 24, 2012 6:30 pm
Posts: 218
cj91legss wrote:
Did you calibrate the iac correctly?

probably not!? how is that done? I just did an ecu reset , did an idle relearn like how we do the 05+ cars


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 Post subject: Re: yep. another idle thread.....
PostPosted: Sat Nov 21, 2015 7:51 pm 
Fifth Gear
Joined: Fri Jun 20, 2008 8:17 am
Posts: 6192
Location: Lakewood, Wa 98439
I think this should help you diagnose the IAC and make sure it's values are set correctly.

http://experiencetherave.com/subaru_man ... C_Diag.zip

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91 L-TW Wagon with a full Swap -RIP
92 SS Prefaced, GD dash swapped, 22T/205 Hybrid 20 psi - BEAST!
93 SS Bone Stock Gone!
94 TW Bone Stock Gone!
91 SS 4EAT Sold!
98 LGT 4EAT
98 LGT Wagon 4EAT


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