Big Problem

MoneyMike02GT · February 12th, 2007, 02:12 PM

i need help or advice because my car is lagging bad. its a 2000 GT, whenever i get on the gas my car will stutter and will barely pick up from start off to around 5000-5500 rpm and then does the same thing after i switch gears. the car runs fine whenever i first start it up in the morning and take it down the road though. if i let it set overnight it runs fine for the first 5 minutes or so and then goes back to the stuttering. i cleaned my iac the day before this started happening. but i dont think i messed anything up because it ran fine for the next few hours. but after i let it set over the night it started acting up the next morning. so if any of you have heard of one doing this let me know something. thanks.

vettekiller · February 12th, 2007, 02:47 PM

Did you say the problem occured after you took off the iac.If you did,did you replace the gasket and what did you clean it with?If you used carb cleaner that will cause it to stick.Also it possibly be o2 sensor.it sounds like it is happening whe the car goes into closed loop.Give me some more info and i can help you.

MoneyMike02GT · February 12th, 2007, 02:52 PM

yeah it occured after i cleaned it. i was on another forum and a guy told me to use ether on it so thats what i used. and no i didnt replace the gasket because it was in good shape.

MoneyMike02GT · February 12th, 2007, 02:53 PM

but sometimes after i run the car when i have to stop at a redlight or stop sign the car will almost quit when it goes to idle.

MoneyMike02GT · February 12th, 2007, 02:55 PM

like i said before, i dunno what happens when the engine is cold but it runs perfect until about 3 or 4 minutes of running it and then it goes back to stuttering around and jerking when i get on the gas

Skidmark · February 13th, 2007, 04:08 AM

Sounds like it has a lean mixture issue, try checking the MAF sensor and see if it needs cleaned. The computer while the engine is cold will run it rich until the sensor tells it that it's warm. So it's after this point that your having the problem. Could be something as simple as a vaccum leak. So i'd tend to start looking in that direction.

97_4.6L_Stang · February 13th, 2007, 01:13 PM

plugs maybe. take it to a goodyear or somewhere with a good diagnostic tool. not the autozone thing. it will monitor the cylinders for missfire. and will monitor fuel to see if its lean

White99stang · February 13th, 2007, 03:23 PM

i think it might be a 02 senser issue also, the question is when you actually floor it does it run fine cause thats when it goes into open loop and then when you are just driving normal it studders, cause mine is doing the same thing now and i need to get underthere and see if i burnt one of my 02 sensors on my headers.

MoneyMike02GT · February 13th, 2007, 06:01 PM

even when i do floor mine it still stutters its like it isnt getting enough gas or something.

MoneyMike02GT · February 13th, 2007, 06:02 PM

but my check engine light isnt on or anything

White99stang · February 13th, 2007, 06:16 PM

i say check your plugs first, i am guessing you don't have a cowl hood, cause water would get it my engine bay when i rained and get down inside my cop and cause a misfire till it dried out

vettekiller · February 16th, 2007, 06:08 AM

When the car is warm take the iac off and see if it is opening.You should not use ether to clean any parts on the intake they are coated and the ether strips it off.Use 3m throttle cleaner it cleans and lubricates and doesn't harm the coating.What happens is the carbon was cleaned off and when it heated up it crusted the iac closed enough to have a good idle when cold as it warms up it doesn't have enough air to breath.Replace the iac and gasket clean the intake side and throttle with 3m throttle cleaner only!

DanishStallion · February 16th, 2007, 07:12 AM

how many miles?

if 50k+ and you never changed your coil pack.

then thats your most likely answer

SWEET2KSTANG · February 16th, 2007, 07:28 AM

i have 85k with stock coils. i agree with the ether and coating issue, but another thing i would look at is the fuel filter.

MoneyMike02GT · February 28th, 2007, 03:17 AM

ok i replaced my iac and gasket but the problem is still there. now my engine sounds really loud, louder than usual and my exhaust tone has changed drastically. my exhaust sounds crackling and my engine just gets really loud and shitty sounding. any ideas on what that could be?

MoneyMike02GT · February 28th, 2007, 05:32 AM

and when i give it gas it sounds like it just revs really high and get really loud but my clutch isnt slipping or anything. i cant figure it out at all.

Casper98GT · February 28th, 2007, 08:42 AM

Maybe you threw a rocker

February 12th, 2007, 02:12 PM	#1
MoneyMike02GT Newbie Join Date: Jan 2007 Posts: 24	Big Problem i need help or advice because my car is lagging bad. its a 2000 GT, whenever i get on the gas my car will stutter and will barely pick up from start off to around 5000-5500 rpm and then does the same thing after i switch gears. the car runs fine whenever i first start it up in the morning and take it down the road though. if i let it set overnight it runs fine for the first 5 minutes or so and then goes back to the stuttering. i cleaned my iac the day before this started happening. but i dont think i messed anything up because it ran fine for the next few hours. but after i let it set over the night it started acting up the next morning. so if any of you have heard of one doing this let me know something. thanks.

February 13th, 2007, 04:08 AM	#6
Skidmark Newbie Join Date: Feb 2007 Location: XENIA, OHIO Posts: 2	Sounds like it has a lean mixture issue, try checking the MAF sensor and see if it needs cleaned. The computer while the engine is cold will run it rich until the sensor tells it that it's warm. So it's after this point that your having the problem. Could be something as simple as a vaccum leak. So i'd tend to start looking in that direction. __________________ DISABLED VETERAN LOVER OF ALL THINGS FORD SMITTEN BY THE MUSTANG

February 13th, 2007, 01:13 PM	#7
97_4.6L_Stang Regular Join Date: Jan 2007 Posts: 106	plugs maybe. take it to a goodyear or somewhere with a good diagnostic tool. not the autozone thing. it will monitor the cylinders for missfire. and will monitor fuel to see if its lean __________________ 97 Mustang GT, MAC CAI, Underdrive Pulleys, Flowmaster Exhaust, BBK Offroad H-Pipe, 3:73 Gear, Autologic Chip, B&M Short Throw Shifter, Centerforce Clutch, Msd, Eibach Sportline Springs

February 16th, 2007, 07:12 AM	#13
DanishStallion Enthusiast Join Date: Sep 2006 Posts: 566	how many miles? if 50k+ and you never changed your coil pack. then thats your most likely answer __________________ http://i90.photobucket.com/albums/k2...79/clubsig.jpg www.irmustangs.eamped.com

February 16th, 2007, 07:28 AM	#14
SWEET2KSTANG MM Fanatic 2000 mustang gt 12.01@114.69 Join Date: Oct 2006 Location: N.W. AR Posts: 3,567	i have 85k with stock coils. i agree with the ether and coating issue, but another thing i would look at is the fuel filter. __________________ stock long block, bolt ons, slicks, and a little squeze 1/4 E.T. 12.06@114.69 Only two defining forces have ever offered to die for you: 1. Jesus Christ 2. The American G. I. One died for your soul, the other for your freedom.

February 12th, 2007, 02:47 PM	#2
vettekiller Newbie Join Date: Feb 2007 Posts: 4	Did you say the problem occured after you took off the iac.If you did,did you replace the gasket and what did you clean it with?If you used carb cleaner that will cause it to stick.Also it possibly be o2 sensor.it sounds like it is happening whe the car goes into closed loop.Give me some more info and i can help you.

February 12th, 2007, 02:52 PM	#3
MoneyMike02GT Newbie Join Date: Jan 2007 Posts: 24	yeah it occured after i cleaned it. i was on another forum and a guy told me to use ether on it so thats what i used. and no i didnt replace the gasket because it was in good shape.

February 12th, 2007, 02:53 PM	#4
MoneyMike02GT Newbie Join Date: Jan 2007 Posts: 24	but sometimes after i run the car when i have to stop at a redlight or stop sign the car will almost quit when it goes to idle.

February 12th, 2007, 02:55 PM	#5
MoneyMike02GT Newbie Join Date: Jan 2007 Posts: 24	like i said before, i dunno what happens when the engine is cold but it runs perfect until about 3 or 4 minutes of running it and then it goes back to stuttering around and jerking when i get on the gas

February 13th, 2007, 06:01 PM	#9
MoneyMike02GT Newbie Join Date: Jan 2007 Posts: 24	even when i do floor mine it still stutters its like it isnt getting enough gas or something.

February 13th, 2007, 06:02 PM	#10
MoneyMike02GT Newbie Join Date: Jan 2007 Posts: 24	but my check engine light isnt on or anything

February 16th, 2007, 06:08 AM	#12
vettekiller Newbie Join Date: Feb 2007 Posts: 4	When the car is warm take the iac off and see if it is opening.You should not use ether to clean any parts on the intake they are coated and the ether strips it off.Use 3m throttle cleaner it cleans and lubricates and doesn't harm the coating.What happens is the carbon was cleaned off and when it heated up it crusted the iac closed enough to have a good idle when cold as it warms up it doesn't have enough air to breath.Replace the iac and gasket clean the intake side and throttle with 3m throttle cleaner only!

February 28th, 2007, 03:17 AM	#15
MoneyMike02GT Newbie Join Date: Jan 2007 Posts: 24	ok i replaced my iac and gasket but the problem is still there. now my engine sounds really loud, louder than usual and my exhaust tone has changed drastically. my exhaust sounds crackling and my engine just gets really loud and shitty sounding. any ideas on what that could be?

February 28th, 2007, 05:32 AM	#16
MoneyMike02GT Newbie Join Date: Jan 2007 Posts: 24	and when i give it gas it sounds like it just revs really high and get really loud but my clutch isnt slipping or anything. i cant figure it out at all.

February 28th, 2007, 08:42 AM	#17
Casper98GT Hardcore Enthusiast Join Date: Aug 2005 Location: NEW HAMPSHIRE Posts: 2,317	Maybe you threw a rocker __________________ Ford/Toyota tech. -93 LX, X303 heads, F-cam, Trickflow u/l, 1.6 RR, FR wires, MSD cap/rotor, Elec. fan, a/c delete, smog delete, sn95 fuel rails with BBK regulator, 75mm TB and EGR, Vortech S-trim w/intercooler, 42lb inj/PMAS, 3.55's -

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