need help with legendary idle issues!!

bl_rdrgz · January 27th, 2012, 11:03 PM

Alright so 1st off its a totally stock 91 GT auto. Has 123k miles. It was driving perfect then I stopped at a stop light longer than usual and rpms suddenly dropped. Almost like it is on the verge of dying. It does this when I start up and when I stop and idle for to long. I have had problems with the iac and I already replaced that. Any suggestions are greatly appreciated!

bl_rdrgz · January 28th, 2012, 09:46 PM

OK well I just changed tps. Problem still there. It takes it about a minute to actually drop rpms

StangBanger302 · January 28th, 2012, 09:59 PM

Check for vaccuum leaks.

bl_rdrgz · January 28th, 2012, 11:54 PM

Already did. That's the 1st thing I checked for. It happens about 1 min after stopped. I'm totally stumped. Also I cleaned the MAF. still no change. I need ideas.

StangBanger302 · January 29th, 2012, 01:12 AM

Clogged cats? I'm bad at diagnosing stalling issues.

bl_rdrgz · January 29th, 2012, 01:50 AM

Not running cats. Got o/r h-pipe. Sorry I forgot to mention. But other than that its stock.

bl_rdrgz · January 29th, 2012, 01:51 AM

Thanks for the suggestions guys.

StangBanger302 · January 29th, 2012, 01:51 AM

Hows your tuneup? Plug, wires etc.

MIGHTYJO3YOUNG · January 29th, 2012, 03:48 AM

Good place to start.

Mustang idle surge and base idle reset

If you just put the new tps on and didn't calibrate it I would check that first.

bl_rdrgz · January 29th, 2012, 12:40 PM

Just did a tune up about 500 miles ago. And calibrate the Tps? I set it at .98 volts.

428CJ · January 29th, 2012, 12:59 PM

You could try replacing your ECT and ACT sensors.

bl_rdrgz · January 29th, 2012, 11:15 PM

Just changed ECT. PROBLEM GONE!!!!

ReefBlue1994 · January 29th, 2012, 11:22 PM

When you said you changed your ECT,where is it actually located?im having the same problem.is it in the hose by the Intake?

Sent from my Autoguide iPhone app

bl_rdrgz · January 30th, 2012, 12:03 AM

Yes. Its on the metal tubing its right by injector number 4 I believe. Its right on top. Took me 10 min to fix. Also make sure you check all vacuum line thoroughly. Spray starter fluid all over engine. Compartment ment. One place at a time. Have to cleaned IAC AND MAF?

ReefBlue1994 · January 30th, 2012, 12:47 AM

No but I have an aftermarket CAI and it's relatively new with the MAF so I figure it's my ECT because it only does it on cold mornings.

Sent from my Autoguide iPhone app

bl_rdrgz · January 30th, 2012, 03:56 PM

OK. Well I hope that fixes your problem as well. Please let us know. Your answer may help others

ReefBlue1994 · January 30th, 2012, 04:12 PM

I just went and picked mine up,and installed it,I'll post tomorrow morning letting you know if it worked!

Sent from my Autoguide iPhone app

bl_rdrgz · January 30th, 2012, 04:43 PM

Alright sweet!!

ReefBlue1994 · January 30th, 2012, 04:53 PM

Now it's throwing a check engine light...could this be from tightening the bolt to tight/frayed wires?what do you guys think?

Sent from my Autoguide iPhone app

ryanw · January 30th, 2012, 05:14 PM

Pull the battery cable for 30 min, it should reset the computer, see if the cel comes back

If it comes back, run your codes

January 27th, 2012, 11:03 PM	#1
bl_rdrgz Regular 1991 Mustang GT 5.0 Join Date: Apr 2011 Location: Tulsa,OK Posts: 172 iTrader: 0 reviews	need help with legendary idle issues!! Alright so 1st off its a totally stock 91 GT auto. Has 123k miles. It was driving perfect then I stopped at a stop light longer than usual and rpms suddenly dropped. Almost like it is on the verge of dying. It does this when I start up and when I stop and idle for to long. I have had problems with the iac and I already replaced that. Any suggestions are greatly appreciated!

January 28th, 2012, 09:59 PM	#3
StangBanger302 Hardcore Enthusiast 1992 Mustang LX 13.0 @ 105 Join Date: Jun 2010 Location: New York Posts: 2,230 iTrader: 0 reviews	Check for vaccuum leaks. __________________ As I lay rubber down the street I pray for traction I can keep But if I spin, and begin to slide Please dear God, protect my ride

January 29th, 2012, 01:12 AM	#5
StangBanger302 Hardcore Enthusiast 1992 Mustang LX 13.0 @ 105 Join Date: Jun 2010 Location: New York Posts: 2,230 iTrader: 0 reviews	Clogged cats? I'm bad at diagnosing stalling issues. __________________ As I lay rubber down the street I pray for traction I can keep But if I spin, and begin to slide Please dear God, protect my ride

January 29th, 2012, 01:51 AM	#8
StangBanger302 Hardcore Enthusiast 1992 Mustang LX 13.0 @ 105 Join Date: Jun 2010 Location: New York Posts: 2,230 iTrader: 0 reviews	Hows your tuneup? Plug, wires etc. __________________ As I lay rubber down the street I pray for traction I can keep But if I spin, and begin to slide Please dear God, protect my ride

January 29th, 2012, 03:48 AM	#9
MIGHTYJO3YOUNG Enthusiast 1992 mustang Lx 13.4@ 106 Join Date: Dec 2006 Location: MD Posts: 569 iTrader: 0 reviews	Good place to start. Mustang idle surge and base idle reset If you just put the new tps on and didn't calibrate it I would check that first. __________________ 1992 5.0 lx_soon to be powered by a m122 GT500 supercharger

January 28th, 2012, 09:46 PM	#2
bl_rdrgz Regular 1991 Mustang GT 5.0 Join Date: Apr 2011 Location: Tulsa,OK Posts: 172 iTrader: 0 reviews	OK well I just changed tps. Problem still there. It takes it about a minute to actually drop rpms

January 28th, 2012, 11:54 PM	#4
bl_rdrgz Regular 1991 Mustang GT 5.0 Join Date: Apr 2011 Location: Tulsa,OK Posts: 172 iTrader: 0 reviews	Already did. That's the 1st thing I checked for. It happens about 1 min after stopped. I'm totally stumped. Also I cleaned the MAF. still no change. I need ideas.

January 29th, 2012, 01:50 AM	#6
bl_rdrgz Regular 1991 Mustang GT 5.0 Join Date: Apr 2011 Location: Tulsa,OK Posts: 172 iTrader: 0 reviews	Not running cats. Got o/r h-pipe. Sorry I forgot to mention. But other than that its stock.

January 29th, 2012, 12:40 PM	#10
bl_rdrgz Regular 1991 Mustang GT 5.0 Join Date: Apr 2011 Location: Tulsa,OK Posts: 172 iTrader: 0 reviews	Just did a tune up about 500 miles ago. And calibrate the Tps? I set it at .98 volts.

January 29th, 2012, 12:59 PM	#11
428CJ Regular Join Date: Oct 2010 Location: Boise, Id Posts: 142 iTrader: 0 reviews	You could try replacing your ECT and ACT sensors. __________________ 1988 Mustang: 5 speed, hurst shifter, plenty slow.

January 29th, 2012, 11:15 PM	#12
bl_rdrgz Regular 1991 Mustang GT 5.0 Join Date: Apr 2011 Location: Tulsa,OK Posts: 172 iTrader: 0 reviews	Just changed ECT. PROBLEM GONE!!!!

January 29th, 2012, 11:22 PM	#13
ReefBlue1994 Regular 1993 Mustang GT Join Date: Jan 2012 Location: Wfalls, Texas Posts: 344 iTrader: 0 reviews	When you said you changed your ECT,where is it actually located?im having the same problem.is it in the hose by the Intake? Sent from my Autoguide iPhone app __________________ 1993 Mustang GT (Reef Blue on platinum) 105k Miles, still strong. BBK CAI Dual Flowmasters Hurst Shortshifter Smog Delete Gatorback pulleys. FULL LED Tailights NEWEST ADDITION: Eaton M90 supercharger kit

January 30th, 2012, 12:03 AM	#14
bl_rdrgz Regular 1991 Mustang GT 5.0 Join Date: Apr 2011 Location: Tulsa,OK Posts: 172 iTrader: 0 reviews	Yes. Its on the metal tubing its right by injector number 4 I believe. Its right on top. Took me 10 min to fix. Also make sure you check all vacuum line thoroughly. Spray starter fluid all over engine. Compartment ment. One place at a time. Have to cleaned IAC AND MAF?

January 30th, 2012, 12:47 AM	#15
ReefBlue1994 Regular 1993 Mustang GT Join Date: Jan 2012 Location: Wfalls, Texas Posts: 344 iTrader: 0 reviews	No but I have an aftermarket CAI and it's relatively new with the MAF so I figure it's my ECT because it only does it on cold mornings. Sent from my Autoguide iPhone app __________________ 1993 Mustang GT (Reef Blue on platinum) 105k Miles, still strong. BBK CAI Dual Flowmasters Hurst Shortshifter Smog Delete Gatorback pulleys. FULL LED Tailights NEWEST ADDITION: Eaton M90 supercharger kit

January 30th, 2012, 03:56 PM	#16
bl_rdrgz Regular 1991 Mustang GT 5.0 Join Date: Apr 2011 Location: Tulsa,OK Posts: 172 iTrader: 0 reviews	OK. Well I hope that fixes your problem as well. Please let us know. Your answer may help others

January 30th, 2012, 05:14 PM	#20
ryanw I Post Entirely Way Too Much 1991 Ford Mustang GT Join Date: May 2007 Location: San Diego, California Posts: 6,063 iTrader: 0 reviews	Pull the battery cable for 30 min, it should reset the computer, see if the cel comes back If it comes back, run your codes __________________ DART 331ci stroker, AFR 185 heads, Trick Flow R intake, Accufab 70mm tb, 75mm pro m Maf, 30lb injectors, jba headers, 2 1/2" x pipe flowmaster super 10 mufflers, 255 fuel pump, 3:27 gears

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January 30th, 2012, 04:12 PM	#17
ReefBlue1994 Regular 1993 Mustang GT Join Date: Jan 2012 Location: Wfalls, Texas Posts: 344 iTrader: 0 reviews	I just went and picked mine up,and installed it,I'll post tomorrow morning letting you know if it worked! Sent from my Autoguide iPhone app __________________ 1993 Mustang GT (Reef Blue on platinum) 105k Miles, still strong. BBK CAI Dual Flowmasters Hurst Shortshifter Smog Delete Gatorback pulleys. FULL LED Tailights NEWEST ADDITION: Eaton M90 supercharger kit

January 30th, 2012, 04:43 PM	#18
bl_rdrgz Regular 1991 Mustang GT 5.0 Join Date: Apr 2011 Location: Tulsa,OK Posts: 172 iTrader: 0 reviews	Alright sweet!!

January 30th, 2012, 04:53 PM	#19
ReefBlue1994 Regular 1993 Mustang GT Join Date: Jan 2012 Location: Wfalls, Texas Posts: 344 iTrader: 0 reviews	Now it's throwing a check engine light...could this be from tightening the bolt to tight/frayed wires?what do you guys think? Sent from my Autoguide iPhone app __________________ 1993 Mustang GT (Reef Blue on platinum) 105k Miles, still strong. BBK CAI Dual Flowmasters Hurst Shortshifter Smog Delete Gatorback pulleys. FULL LED Tailights NEWEST ADDITION: Eaton M90 supercharger kit

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