Weird Idle problem

geolebon · February 12th, 2007, 10:36 AM

I have a 1999 Convertible GT. The car runs fine except when I come to a stop, the idle drops to about 400RPM ( when warm ) and feels like it wants to stall. This happens for just a second and the idle returns to normal. Dealer is clueless. Please HELP....

Drgnracin72 · February 12th, 2007, 10:44 AM

IAC senser. idle air control valve. its wht makes your car idle. it gets dirty sometimes and you have to remove it and just spray it out with some carb cleaner, put a few q-tips in there and clean it out. do you know where the plenum on your car is? its is the little thing tht sticks right off of the front of the plenum held by two bolts

Drgnracin72 · February 12th, 2007, 10:47 AM

heres a pic of it

ibanez570x · February 12th, 2007, 11:33 AM

I know using that pic was just an excuse to show off your super charger..... :-)

neckbonekat · February 12th, 2007, 11:38 AM

Is that a home made CAI?

Drgnracin72 · February 12th, 2007, 11:50 AM

i dont have a supercharger anymore, and no its not homeade, its all procharger stuff

ibanez570x · February 12th, 2007, 11:59 AM

no more supercharger? why?

Drgnracin72 · February 12th, 2007, 12:20 PM

becasue i blew up that motor, now have a fully built stroker, with a lot of n2o, and am going to do twin turbos

ibanez570x · February 12th, 2007, 01:30 PM

what did you end up doing with the SC?

Drgnracin72 · February 12th, 2007, 02:43 PM

sold it to sonicblue on this website. he got a helluva deal on it. i had it for sale for a long time and finally lowered it to get id of it.

anyways back to the subject, its probably your iac. try it out and let us know how it runs after you clean it?

MustangMatt96GT · February 12th, 2007, 07:52 PM

How come i cant see many pictures that people post? I use safari for my browser. Im asking this, because i would like to clean my IAC but dont know exactly how. Thanks and if you would like to email me a picture or two of it i would aprecate it. gearhead99@gmail.com
Thanks

MustangMatt96GT · February 12th, 2007, 07:53 PM

Guess what nevermind cuz the picture showed up i dont know why it wouldnt before thou.

neckbonekat · February 13th, 2007, 01:54 AM

Originally Posted by MustangMatt96GT

How come i cant see many pictures that people post? I use safari for my browser. Im asking this, because i would like to clean my IAC but dont know exactly how. Thanks and if you would like to email me a picture or two of it i would aprecate it. gearhead99@gmail.com
Thanks

I have a MAC too. Download firefox. It makes things much easier on alot of web sites..

geolebon · February 13th, 2007, 07:09 AM

Dealer arlready replaced the IAC, still have the problem. Dealer has no answer. The car idles great except when I come to a full stop. The instant the wheels stop moving is when the idle drops for a second and returns to normal. By the way the car is a 5 speed and this happens when the clutch is not engaged coming to a stop.

ibanez570x · February 13th, 2007, 11:07 AM

yea my 2000 did the same exact thing.... cleaned the IAC throttle body and plennum.... no more issues.... last thing... do you have a powerful stereo? big amps as the car comes to a stop can drain the power and make your RPM's go down...

OcOnnor220 · February 13th, 2007, 08:32 PM

That happens to me when I dont shift properly and then stop and put the car in neutral, I think its abuse to the clutch thats making your car idle like that cause I gummed out my engine thoroughly last month. I usually make sure I shift properly and smoothly but since I drive the car everyday...sometimes the mind wanders...and at a red light idle the engine will ALMOST stall for just a second and then idle at the rpm again. This especially happens if I do that and have the AC on. But if I take off again and ease into every gear, making sure I dont ride the clutch and shift smoothly it won't do it again. If any of this sounds like you it may not be your intake...I dont know.

allpaidfor · February 13th, 2007, 11:18 PM

hey wouldn't hurt to check your spark plug wires. (start from the coil pack) this happened to my car a couple of months ago after i replaced my plugs and wires. i found one of the wires just barely makin it on the plug itself. may or may not be in your case, but mines ok now.

WAR-PARTY · February 17th, 2007, 09:10 PM

vacum leak, not easy to find.

February 12th, 2007, 10:36 AM	#1
geolebon Newbie Join Date: Feb 2007 Posts: 2 iTrader: 0 reviews	Weird Idle problem I have a 1999 Convertible GT. The car runs fine except when I come to a stop, the idle drops to about 400RPM ( when warm ) and feels like it wants to stall. This happens for just a second and the idle returns to normal. Dealer is clueless. Please HELP....

February 12th, 2007, 10:44 AM	#2
Drgnracin72 I Post Entirely Way Too Much Join Date: Jan 2006 Location: somewhere in oklahoma Posts: 10,635 iTrader: 2 reviews	IAC senser. idle air control valve. its wht makes your car idle. it gets dirty sometimes and you have to remove it and just spray it out with some carb cleaner, put a few q-tips in there and clean it out. do you know where the plenum on your car is? its is the little thing tht sticks right off of the front of the plenum held by two bolts __________________ RIP ΜΟΛΩΝ ΛΑΒΕ Political Correctness is a doctrine, fostered by a delusional, illogical, liberal minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a turd by the clean end. One Big Ass Mistake America SHEEPDOGS

February 12th, 2007, 11:38 AM	#5
neckbonekat I Post Entirely Way Too Much 2005 Cadillac STS V8 ???????????????? Join Date: Dec 2006 Location: Upstate NY Posts: 6,344 iTrader: 3 reviews	Is that a home made CAI? __________________ ITEMS FOR SALE! 4.10 GEARS + BEARING KIT

February 12th, 2007, 11:50 AM	#6
Drgnracin72 I Post Entirely Way Too Much Join Date: Jan 2006 Location: somewhere in oklahoma Posts: 10,635 iTrader: 2 reviews	i dont have a supercharger anymore, and no its not homeade, its all procharger stuff __________________ RIP ΜΟΛΩΝ ΛΑΒΕ Political Correctness is a doctrine, fostered by a delusional, illogical, liberal minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a turd by the clean end. One Big Ass Mistake America SHEEPDOGS

February 12th, 2007, 12:20 PM	#8
Drgnracin72 I Post Entirely Way Too Much Join Date: Jan 2006 Location: somewhere in oklahoma Posts: 10,635 iTrader: 2 reviews	becasue i blew up that motor, now have a fully built stroker, with a lot of n2o, and am going to do twin turbos __________________ RIP ΜΟΛΩΝ ΛΑΒΕ Political Correctness is a doctrine, fostered by a delusional, illogical, liberal minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a turd by the clean end. One Big Ass Mistake America SHEEPDOGS

February 12th, 2007, 11:33 AM	#4
ibanez570x Regular Join Date: Oct 2006 Location: Maryland Posts: 203 iTrader: 0 reviews	I know using that pic was just an excuse to show off your super charger..... :-)

February 12th, 2007, 11:59 AM	#7
ibanez570x Regular Join Date: Oct 2006 Location: Maryland Posts: 203 iTrader: 0 reviews	no more supercharger? why?

February 12th, 2007, 01:30 PM	#9
ibanez570x Regular Join Date: Oct 2006 Location: Maryland Posts: 203 iTrader: 0 reviews	what did you end up doing with the SC?

February 12th, 2007, 02:43 PM	#10
Drgnracin72 I Post Entirely Way Too Much Join Date: Jan 2006 Location: somewhere in oklahoma Posts: 10,635 iTrader: 2 reviews	sold it to sonicblue on this website. he got a helluva deal on it. i had it for sale for a long time and finally lowered it to get id of it. anyways back to the subject, its probably your iac. try it out and let us know how it runs after you clean it? __________________ RIP ΜΟΛΩΝ ΛΑΒΕ Political Correctness is a doctrine, fostered by a delusional, illogical, liberal minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a turd by the clean end. One Big Ass Mistake America SHEEPDOGS

February 12th, 2007, 07:52 PM	#11
MustangMatt96GT Proud American 1996 Mustang GT Join Date: Dec 2006 Location: Lakewood, CO Posts: 10,689 iTrader: 3 reviews	How come i cant see many pictures that people post? I use safari for my browser. Im asking this, because i would like to clean my IAC but dont know exactly how. Thanks and if you would like to email me a picture or two of it i would aprecate it. gearhead99@gmail.com Thanks

February 12th, 2007, 07:53 PM	#12
MustangMatt96GT Proud American 1996 Mustang GT Join Date: Dec 2006 Location: Lakewood, CO Posts: 10,689 iTrader: 3 reviews	Guess what nevermind cuz the picture showed up i dont know why it wouldnt before thou.

February 13th, 2007, 07:09 AM	#14
geolebon Newbie Join Date: Feb 2007 Posts: 2 iTrader: 0 reviews	Dealer arlready replaced the IAC, still have the problem. Dealer has no answer. The car idles great except when I come to a full stop. The instant the wheels stop moving is when the idle drops for a second and returns to normal. By the way the car is a 5 speed and this happens when the clutch is not engaged coming to a stop.

February 13th, 2007, 11:07 AM	#15
ibanez570x Regular Join Date: Oct 2006 Location: Maryland Posts: 203 iTrader: 0 reviews	yea my 2000 did the same exact thing.... cleaned the IAC throttle body and plennum.... no more issues.... last thing... do you have a powerful stereo? big amps as the car comes to a stop can drain the power and make your RPM's go down...

February 13th, 2007, 08:32 PM	#16
OcOnnor220 Enthusiast Join Date: Oct 2006 Posts: 520 iTrader: 0 reviews	That happens to me when I dont shift properly and then stop and put the car in neutral, I think its abuse to the clutch thats making your car idle like that cause I gummed out my engine thoroughly last month. I usually make sure I shift properly and smoothly but since I drive the car everyday...sometimes the mind wanders...and at a red light idle the engine will ALMOST stall for just a second and then idle at the rpm again. This especially happens if I do that and have the AC on. But if I take off again and ease into every gear, making sure I dont ride the clutch and shift smoothly it won't do it again. If any of this sounds like you it may not be your intake...I dont know.

February 13th, 2007, 11:18 PM	#17
allpaidfor Newbie Join Date: Jan 2007 Location: corn fields, illinois Posts: 49 iTrader: 0 reviews	hey wouldn't hurt to check your spark plug wires. (start from the coil pack) this happened to my car a couple of months ago after i replaced my plugs and wires. i found one of the wires just barely makin it on the plug itself. may or may not be in your case, but mines ok now. __________________ ok so how much did your parents pay for your car?

February 17th, 2007, 09:10 PM	#18
WAR-PARTY Hardcore Enthusiast 2001 YUGO GT Join Date: Aug 2006 Location: GOAT LOCKER PENSACOLA FL Posts: 1,700 Blog Entries: 1 iTrader: 0 reviews	vacum leak, not easy to find. __________________ How I met my wife! Our first date...

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