IAC help / idle help please

rocket · November 30th, 2010, 01:12 PM

My '90 GT surges at idle going from 400 to about 1200 rpm, sometimes even dying. I replaced the IAC but it wasnt any better, maybe alil worse. When I unplug the IAC it seems to idle fine, no surging. Then when I plug it back in it idles like crap.

Any ideas or hints to try? I unplugged the IAC and shut the car off, now have battery unplugged. Will try plugging it all back in to see if it resets itself, but other than that im kinda at a loss.

AdderMk2 · November 30th, 2010, 02:36 PM

clean your maf, check and replace your O2 sensors, look for vac leaks...

all the normal jazz. However, this seems to be pretty normal when people add mods to their car but dont get it tuned, or tuned properly.

you are probably running too rich at idle

centipede3001 · November 30th, 2010, 03:10 PM

did you set the idle properly ?
Mine was doing the same thing and i looked up the sticky on how to properly set the idle and now my cars idles a lot better but if you have a cam it might always move a little but it should jump from 400-1200

November 30th, 2010, 01:12 PM	#1
rocket Regular 1990 Mustang GT Join Date: Aug 2006 Location: Ankeny, IA Posts: 88 iTrader: 0 reviews	IAC help / idle help please My '90 GT surges at idle going from 400 to about 1200 rpm, sometimes even dying. I replaced the IAC but it wasnt any better, maybe alil worse. When I unplug the IAC it seems to idle fine, no surging. Then when I plug it back in it idles like crap. Any ideas or hints to try? I unplugged the IAC and shut the car off, now have battery unplugged. Will try plugging it all back in to see if it resets itself, but other than that im kinda at a loss. __________________ '90 GT Vortec SI with pro-pipe Eibach pro kit KYB adjustable shocks/struts BBK headers/x-pipe/american thunders

November 30th, 2010, 02:36 PM	#2
AdderMk2 Banned Join Date: Aug 2007 Location: al-Ahhmadi, Kuwait Posts: 991 iTrader: 0 reviews	clean your maf, check and replace your O2 sensors, look for vac leaks... all the normal jazz. However, this seems to be pretty normal when people add mods to their car but dont get it tuned, or tuned properly. you are probably running too rich at idle __________________ [URL="http://providence.craigslist.org/cto/2148862880.html"]1994 Cobra For Sale[/URL] [SIGPIC][/SIGPIC] [QUOTE=Timm10221]Its only a 10 inch Tach that sits right in the center of the dash with LED lights and a Spinner bezel that has dimonds and gold plating.. And when you hit 4500 plus is sounds off (AAHHH SHITT) :cool:[/QUOTE]

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November 30th, 2010, 03:10 PM	#3
centipede3001 Regular Join Date: Dec 2009 Posts: 196 iTrader: 0 reviews	did you set the idle properly ? Mine was doing the same thing and i looked up the sticky on how to properly set the idle and now my cars idles a lot better but if you have a cam it might always move a little but it should jump from 400-1200

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