legacycentral bbs

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.

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
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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

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

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.

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!!!!!

Still battling crap running.....i took a vid


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

Did you calibrate the iac correctly?

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

I think this should help you diagnose the IAC and make sure it's values are set correctly.

http://main.experiencetherave.com/subar ... C_Diag.zip