Cars rpm's always pulse's up and Down when coming to stop.. HELP!

[Highroller]

This is has been happening for a while, but it has since gotten worse.. As I start to come to a stop.., instead of my rpms slowly going down right at 2000 rpm they drop to 1500 and start pulsing.. like its going to die.. up.. down.. up down.. then it settles at 600 rpm's.. its very annoying.. the actualy Idle never goes below 600..

I have changed out my IAC.. what do you guys think.. do you think it could be my MAF? I have the Stock MAF on the car..

 

[jeff1414]

mine does the same thing sometimes so hopefully some one can help us out!!!

 

[Highroller]

mine does the same thing sometimes so hopefully some one can help us out!!!

It really started acting up once I switched my MAF back to stock.. Maybe I didn't position the MAF perfectly, I heard they can be tempermental (sp)

 

[jeff1414]

I have never touched mine so i don't know what is wrong. maybe i need a tune up or something..?????

 

[cobra killer]

99-00 is horrible about that.I've almost got it figured out tho.

The 03 model is probalby a TPS or just a dirty IAC..

The 99-00 has a glitch in the template causing it.Im trying a few things and should have an answer/fix shortly..

Tim

 

[jeff1414]

let me know when you figure that out because i would really like to fix this problem but like i said it only happens sometimes. Thanks.......
Jeff

 

[Highroller]

99-00 is horrible about that.I've almost got it figured out tho.

The 03 model is probalby a TPS or just a dirty IAC..

The 99-00 has a glitch in the template causing it.Im trying a few things and should have an answer/fix shortly..

Tim

Could definately be the TPS and IAC, since I took both off during my Plenum, Throttlebody install

please let us know Tim, I wonder if its hurting my ET's?

I will clean my IAC again, and check on my TPS

 

[lasrred99gt]

99-00 is horrible about that.I've almost got it figured out tho.

The 03 model is probalby a TPS or just a dirty IAC..

The 99-00 has a glitch in the template causing it.Im trying a few things and should have an answer/fix shortly..

Tim

mine does it too, especially when cold.

 

[Bgt2000]

mine does that also but it only does it when i have the defroster on so i'm not sure

 

[Brisk281GT]

My eagle talon used to do that pretty violently, I was told by all that it is probably a sensor of some kind.

 

[Highroller]

mine does that also but it only does it when i have the defroster on so i'm not sure

I agree regarding the defroster and or A/C.. I wish I could bring this to FORD and have them check it out, but they will point and laugh when they see my mods.. and there goes my warranty. even though I don't think they have anything to do with this problem

 

[00VERT GT]

i've had the same problem since i've bought my car. Ford does NOT have a fix for it they say it's normal. (even though the ford rep said he had never seen it bofore) -jerks- I have replaced my IAC twice in hope that maybe that might work........nothing. haven't tried replacing the MAF yet. It looks like they aren't very cheap.

 

[281Ponies]

My 00GT does this as well. It’s as if the computer is attempting to adapt - find the correct idle rpm, consistently searching for it but never quite finds it. At best it temporarily seems to settle in at a correct idle only to start searching for it again.

-Cale

 

[Highroller]

My 00GT does this as well. It’s as if the computer is attempting to adapt - find the correct idle rpm, consistently searching for it but never quite finds it. At best it temporarily seems to settle in at a correct idle only to start searching for it again.

-Cale

very good description.. I don't really worry about it dying.. because it settles down around 1k.. but i hate when it happens.. it can't be good