help..car dies when stopping!!!

[bill302]

2002 gt stang the motor dies when i stop. i will pull codes tommorrow but what can i do to try and fix it tonight. has anyone had this problem before. its a friends stang when he gets here i'm going to clean maf and iac and reset computer to see if that helps what else to do?and to reset computer can i unhook battery for 30 mins.right?

 

[DropTopPony]

sounds like an iac issue, clean it out. Hopefully thats all it is.

 

[bill302]

i'll clean it and reinstall. he has deleted the pcv valve and is running 2 filters i don't think this would affect anything.... to reset computer disconnect the battery?

 

[00GTMarine]

Same thing happened to me and after cleaning the IAC she ran perfectly~I hope thats it too, easy fix

 

[Mike97gt]

tap the IAC with a hammer and see if it's better after that.

even if it is you need a new IAC

 

[bill302]

Same thing happened to me and after cleaning the IAC she ran perfectly~I hope thats it too, easy fix

would your stang idle right after you cranked it.because his stang idles great until you give it some gas and upon returning to idle it stumbles and dies most all the time...

 

[00GTMarine]

Mine stumbled right when I cranked it...let us know how it turns out after you clean and tap the iac and the maf

 

[bill302]

o.k. thanks for the advise...

 

[04gtdrop]

i just started having this same problem as of two days ago!!!! mine is a 2004 GT. Do you think cleaning the MAF and IAC will help? how do i clean it with out breaking it?

thx

 

[bill302]

click on links below it demonstrates how to clean maf and iac it demonstrated on sn95s but the application is similar on your stang...
http://www.muscularmustangs.com/maf.php
http://www.muscularmustangs.com/iac.php

 

[bill302]

well cleaned maf and iac no change run seafoam through entire system intake and gas system. added 93 octane problem cleared up i'm suspecting bad gas ...problem solved and thanks for all the help....

 

[00GTMarine]

As high as gas is right now there should be no such thing as bad gas....those bastards

 

[DerekStangGT]

take a hammer and LIGHTLY tap the IAC valve a few times to break up the carbon buildup. i did that on mine when it started to die ~10k miles ago. it ran great after that, and i just had to "tap" the IAC again last week when it started acting up again. i just dont wanna shell out $80 for a new IAC valve

EDIT:damn, Mike beat me to it....hah. Mike i wanna know honestly how many times people come in for dying, and the techs tap the IAC to correct, then charge 1.5 for an IAC r/r. haha

 

[Kilgore Trout]

I would rather use a long handled screwdiver than an actual hammer to tap the IAC myself...

 

[DerekStangGT]

I would rather use a long handled screwdiver than an actual hammer to tap the IAC myself...

i didnt say to use a sledge. a hammer is fine, but if you are such a hauss like trout, and have too much strenth, you can use a long handled screwdriver. most people have a hammer though.

 

[KronicRacer]

if it happens again pull the code if it says PO4xx evap emmissions system leak detected (small/gross leak) culprits are the filler cap or the neck assembly to tank itsself, what happened to mine recently. basically the fuel tank cant get pressureized to what it should be at, making a no no condition.

things to look out for:
*drip by fuel tank(passenger side)
*smell of raw fuel
*the above mentioned code

 

[Y2K_MustangVert]

I have had this happening for the past couple months, and just replaced the IAC and it didn't help at all. Here is a stupid question, and I don't mean to hijack the thread, but when you install a new IAC should you disconnect the battery so that it can relearn the idle?

 

[Kilgore Trout]

It never hurts to reset the PCM (disconnect battery) anytime you are making changes to the car such as replacing or upgrading parts.

Custom tunes are NOT LOST when resetting PCM.