update on idleing probs - still doing it

M0T0PSYC0 · May 17th, 2008, 03:16 AM

Ok as i had mentioned before my car after warmed up drops to die then jumps itself upto about 3grand then does it all over, I have gone through all the iac stuff no change, havent messed with the tps yet, but did get new plugs, now the others had been in for awhile and the guy who owned it must have not done it right cus they were gapped at .040, i installed the newones at .052-.056. definatly ran smoother but the prob is still there basically. Except now it just dies and dont jump upto 3 grand, however no when in nuetral with no load basically with clutch out it dont die, were before it still would, so I think im on the right track but could use a few more ideas. And the car has always had premium in it so the injectors shouldnt be too bad at 133k miles though. I dont think its the coils cuz the car doesnt miss or hesitate, however if this helps draw any ideas the car bucks alot from takeoff-3rd gear, and that is annoying as hell in itself, so i think these probs may be related but havent a clue on this one. please help guys

00silvergt · May 17th, 2008, 03:19 AM

did u just clean the IAC or did u replace it? it might be beyond cleaning.

M0T0PSYC0 · May 17th, 2008, 03:22 AM

it was new when i got the car, and laso swapped in another one i knew was good in case it was a bad replacement part, but did it just the same, although definatly runs smoother with the new one, but no change with the dieing and bucking issues

M0T0PSYC0 · May 17th, 2008, 07:01 AM

ok, well i eliminated the tps idea,swapped that out, still the same, any good suggestions guys? I really need some help with this. It's my daily driver but not so much of a driver if its gunna die every time I drive. also I swapped out the k&n cai for the stock unit including cleaned maf also so that wouldnt be the prob either.

MineralGreyGT · May 17th, 2008, 07:04 AM

did you try checking your MAF housing for any cracks, or cleaned the MAF? I had a similar problem but I have a 5-speed and it ended up being a crack in the MAF housing and air was being drawn up from to different locations and was throwing my MAF out of whack.

M0T0PSYC0 · May 17th, 2008, 07:06 AM

thats all fine and I have a 5-speed also

Doc8224 · May 17th, 2008, 08:53 AM

Try spraying some brake cleaner on some of the vacum lines to check for leaks, it will rev up if there is a leak when you hit it with the brake cleaner.

cliffyk · May 17th, 2008, 11:40 AM

Have you disconnected the battery for 5-7 minutes, to reset the KAM (Keep Alive Memory)?

The KAM is where the PCM stores all learned values, including idle air trim, short and long term fuel trims, etc)--resetting it causes the PCM to relearn the values.

M0T0PSYC0 · May 18th, 2008, 02:49 AM

I am gunna check for vaccum leaks tonight, and as far as battery disconnect, whenever I am swapping stuff around to check it out i always leave disconnected for at least 20 minutes, but usually 30 or more

May 17th, 2008, 03:16 AM	#1
M0T0PSYC0 Regular 1999 Mustang GT 13.8 Join Date: May 2008 Location: Otsego, MI Posts: 142	update on idleing probs - still doing it Ok as i had mentioned before my car after warmed up drops to die then jumps itself upto about 3grand then does it all over, I have gone through all the iac stuff no change, havent messed with the tps yet, but did get new plugs, now the others had been in for awhile and the guy who owned it must have not done it right cus they were gapped at .040, i installed the newones at .052-.056. definatly ran smoother but the prob is still there basically. Except now it just dies and dont jump upto 3 grand, however no when in nuetral with no load basically with clutch out it dont die, were before it still would, so I think im on the right track but could use a few more ideas. And the car has always had premium in it so the injectors shouldnt be too bad at 133k miles though. I dont think its the coils cuz the car doesnt miss or hesitate, however if this helps draw any ideas the car bucks alot from takeoff-3rd gear, and that is annoying as hell in itself, so i think these probs may be related but havent a clue on this one. please help guys __________________ 99 forrest green vert: -Diablosport Predator & Tune (removed for cheap gas use) -Motive 3.90 gears -MRT Catted H -Flowmaster American Thunder catback -Eibach Sportlines -Tokico D-Spec shocks & struts My Garage

May 17th, 2008, 03:19 AM	#2
00silvergt Regular 2000 Mustang Gt Join Date: Jun 2006 Location: Pennsylvania Posts: 428	did u just clean the IAC or did u replace it? it might be beyond cleaning. __________________ Tuned by Joe at Tricktuners.com

May 17th, 2008, 03:22 AM	#3
M0T0PSYC0 Regular 1999 Mustang GT 13.8 Join Date: May 2008 Location: Otsego, MI Posts: 142	it was new when i got the car, and laso swapped in another one i knew was good in case it was a bad replacement part, but did it just the same, although definatly runs smoother with the new one, but no change with the dieing and bucking issues __________________ 99 forrest green vert: -Diablosport Predator & Tune (removed for cheap gas use) -Motive 3.90 gears -MRT Catted H -Flowmaster American Thunder catback -Eibach Sportlines -Tokico D-Spec shocks & struts My Garage

May 17th, 2008, 07:01 AM	#4
M0T0PSYC0 Regular 1999 Mustang GT 13.8 Join Date: May 2008 Location: Otsego, MI Posts: 142	ok, well i eliminated the tps idea,swapped that out, still the same, any good suggestions guys? I really need some help with this. It's my daily driver but not so much of a driver if its gunna die every time I drive. also I swapped out the k&n cai for the stock unit including cleaned maf also so that wouldnt be the prob either. __________________ 99 forrest green vert: -Diablosport Predator & Tune (removed for cheap gas use) -Motive 3.90 gears -MRT Catted H -Flowmaster American Thunder catback -Eibach Sportlines -Tokico D-Spec shocks & struts My Garage

May 17th, 2008, 07:04 AM	#5
MineralGreyGT Regular Join Date: Jun 2007 Posts: 376	did you try checking your MAF housing for any cracks, or cleaned the MAF? I had a similar problem but I have a 5-speed and it ended up being a crack in the MAF housing and air was being drawn up from to different locations and was throwing my MAF out of whack. __________________ Studies show that 92% of kids listen to rap. If you are one of the 8% who still listens to real music put this in your signature.

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May 17th, 2008, 07:06 AM	#6
M0T0PSYC0 Regular 1999 Mustang GT 13.8 Join Date: May 2008 Location: Otsego, MI Posts: 142	thats all fine and I have a 5-speed also __________________ 99 forrest green vert: -Diablosport Predator & Tune (removed for cheap gas use) -Motive 3.90 gears -MRT Catted H -Flowmaster American Thunder catback -Eibach Sportlines -Tokico D-Spec shocks & struts My Garage

May 17th, 2008, 08:53 AM	#7
Doc8224 N/A 4v Guru 2003 Mach 1 Join Date: Oct 2007 Location: N.W. Arkansas Posts: 3,039	Try spraying some brake cleaner on some of the vacum lines to check for leaks, it will rev up if there is a leak when you hit it with the brake cleaner. __________________ *Gone To Basic Training*

May 17th, 2008, 11:40 AM	#8
cliffyk Regular Join Date: Feb 2007 Location: Saint Augustine, FL Posts: 497	Have you disconnected the battery for 5-7 minutes, to reset the KAM (Keep Alive Memory)? The KAM is where the PCM stores all learned values, including idle air trim, short and long term fuel trims, etc)--resetting it causes the PCM to relearn the values. __________________ -cliff knight- My Mustang GT 2003 GT, UPR X, Magnaflow, 180° stat, PP 70mm TB & plenum, Sniper Commando tuned 3.73s, 252 rwHP/296 ft.lb. Multi-fuel: burns gas and rubber...

May 18th, 2008, 02:49 AM	#9
M0T0PSYC0 Regular 1999 Mustang GT 13.8 Join Date: May 2008 Location: Otsego, MI Posts: 142	I am gunna check for vaccum leaks tonight, and as far as battery disconnect, whenever I am swapping stuff around to check it out i always leave disconnected for at least 20 minutes, but usually 30 or more __________________ 99 forrest green vert: -Diablosport Predator & Tune (removed for cheap gas use) -Motive 3.90 gears -MRT Catted H -Flowmaster American Thunder catback -Eibach Sportlines -Tokico D-Spec shocks & struts My Garage

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