Strange Idle

fateisajester · November 4th, 2008, 11:07 AM

Well my car was not idleing correctly so i did the base idle reset and it idles great now, except for one thing. After its been running for about 5 mins, it will idle up at 1600 and not go back down. i have to restart the car in order for it to idle correctly again. At first i though it was just the computer trying to learn the new idle set up but its been a few days now and its still doing it.

any ideas?

Nice 5.0 · November 4th, 2008, 09:16 PM

Check for a vacuum leak and look at your IAC motor.

e3sean · November 4th, 2008, 10:42 PM

thats been happening alot lately. the most common things. vaccume leaks,iac bad or dirty,computer bad,tps sensor off,o2 sensors,timing, it is getting colder the temp could have something to do with it.

fateisajester · November 5th, 2008, 08:47 PM

Originally Posted by e3sean

thats been happening alot lately. the most common things. vaccume leaks,iac bad or dirty,computer bad,tps sensor off,o2 sensors,timing, it is getting colder the temp could have something to do with it.

i checked for vacuum leaks
it does it with the a/c off so not the iac
possibly a bad ecu but doubt it
tps is at .99
i dont know how to check the o2 sensors
timing is at 12^adv
I live in florida and its still getting in the 90s

the strangest part about the whole deal is when its idling bad, I can turn the key off and on real fast(just enough to kill the ign for a split second) and it startes idling fine again.

I freaking hate efi!!!

anyone else have any ideas?

::edit:: btw, i ran the codes on it and only got smog related codes.

cisco191roush · November 6th, 2008, 08:16 PM

I got the same problem on my 91 I can't figure out what the problem might be, got new IAC, oxigen sensors, new vaccum lines, tps sensor and the problem still there.

fateisajester · November 7th, 2008, 09:51 AM

Well im going to pull the tps today and try to clean it. maybe that has something to do with it.

jcashmoney018 · November 7th, 2008, 10:47 AM

i would say it probably is ur ecu or the oxygen sensors. If it dosent go back down after you clean your tps the check your ecu. It also might be a compter problem.

vfast · November 7th, 2008, 09:19 PM

clean the egr valve

fateisajester · November 8th, 2008, 03:29 AM

Originally Posted by vfast

clean the egr valve

egr isnt even hooked up. The wires are but the vac line isnt. Do you think that could cause the prob?

flamed 98 gt · November 8th, 2008, 08:04 PM

I had the same issue. Come to find out I had a bad ground from the block. Also I reinstalled the salt and pepper shaker plugs. Now it idles about 850 after it warms up.

americanmuscle90 · November 9th, 2008, 12:38 PM

Check the IAC and it's wiring you could have a short somewhere that is causing the IAC to be commanded open more than it should be. start at the IAC and test the wiring all the way to the computer.

November 4th, 2008, 11:07 AM	#1
fateisajester Regular 1989 Ford Mustang 3 mins Join Date: Sep 2008 Location: Orlando, FL Posts: 378 iTrader: 0 reviews	Strange Idle Well my car was not idleing correctly so i did the base idle reset and it idles great now, except for one thing. After its been running for about 5 mins, it will idle up at 1600 and not go back down. i have to restart the car in order for it to idle correctly again. At first i though it was just the computer trying to learn the new idle set up but its been a few days now and its still doing it. any ideas? __________________

November 4th, 2008, 10:42 PM	#3
e3sean I Post Entirely Way Too Much 1988 lx 9.68@142 Join Date: Nov 2007 Location: goldsboro NC Posts: 5,609 iTrader: 0 reviews	thats been happening alot lately. the most common things. vaccume leaks,iac bad or dirty,computer bad,tps sensor off,o2 sensors,timing, it is getting colder the temp could have something to do with it. __________________

November 7th, 2008, 09:51 AM	#6
fateisajester Regular 1989 Ford Mustang 3 mins Join Date: Sep 2008 Location: Orlando, FL Posts: 378 iTrader: 0 reviews	Well im going to pull the tps today and try to clean it. maybe that has something to do with it. __________________

November 7th, 2008, 09:19 PM	#8
vfast Banned Join Date: Aug 2005 Location: shimmy shack takeout Posts: 1,084 iTrader: 0 reviews	clean the egr valve __________________ EVERYONE IS ENTITLED TO MY OPINION:cool: 6'ers are for kids 1965 chevelle SS 421 sbc 6 speed, 3.90 gears,alum d-shaft, brodix heads,roller cam,925 AED carb...grocery getter[COLOR="Red"]RIP[/COLOR]

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November 4th, 2008, 09:16 PM	#2
Nice 5.0 Regular 1993 12.9 @ 105 Join Date: Jan 2007 Location: Raleigh NC Posts: 299 iTrader: 0 reviews	Check for a vacuum leak and look at your IAC motor.

November 6th, 2008, 08:16 PM	#5
cisco191roush Newbie 1991 hatchback Gt Join Date: May 2008 Location: chattanooga tn Posts: 36 iTrader: 0 reviews	I got the same problem on my 91 I can't figure out what the problem might be, got new IAC, oxigen sensors, new vaccum lines, tps sensor and the problem still there.

November 7th, 2008, 10:47 AM	#7
jcashmoney018 Newbie Join Date: Sep 2008 Posts: 15 iTrader: 0 reviews	i would say it probably is ur ecu or the oxygen sensors. If it dosent go back down after you clean your tps the check your ecu. It also might be a compter problem.

November 8th, 2008, 08:04 PM	#10
flamed 98 gt Regular 1990 5.0 LX Notch Join Date: Sep 2006 Location: The Colony, TX Posts: 375 iTrader: 0 reviews	I had the same issue. Come to find out I had a bad ground from the block. Also I reinstalled the salt and pepper shaker plugs. Now it idles about 850 after it warms up.

November 9th, 2008, 12:38 PM	#11
americanmuscle90 Newbie 1990 mustang gt n/a Join Date: Sep 2008 Location: washington Posts: 17 iTrader: 0 reviews	Check the IAC and it's wiring you could have a short somewhere that is causing the IAC to be commanded open more than it should be. start at the IAC and test the wiring all the way to the computer.

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