Car Is Cutting Out! Help!

March 12th, 2006, 03:17 AM	#1
streetstang06 Newbie Join Date: Jan 2006 Posts: 17	Car Is Cutting Out! Help! I need help with my car. The check engine light never came on and every time i turn on any type of air conditioning or heater whether it defrost or vent, my car will cut out. It doesn't do it while i'm actually driving but if i take it out of gear and coast it nearly kills itself. Letting it idle i can hear it drop rpm's really fast but then it catches itself before it dies. It is a 1998 mustang gt. 4.6 L. five speed.

March 12th, 2006, 08:59 AM	#2
lemon Enthusiast Join Date: Aug 2005 Posts: 665	check your iac valve. sometimes carbon builds up, and starts catching the valve portion ... sometimes it gets caught closed. when coasting, your throttle is closed, so the iac kicks in to keep the engine running. and if it gets caught up closed, your engine will shutoff.

March 12th, 2006, 09:43 PM	#3
Twist 2 Go Hardcore Enthusiast Join Date: Aug 2005 Location: Chesapeake, Virginia Posts: 1,716	definetly sounds like an iac problem. time to replace it. sometimes you can clean them, but they usually stick again in no time. __________________ 88 Mustang Coupe 2006 FFW Richmond True Street Runner-Up www.rickscarcare.net http://img146.imageshack.us/img146/2158/ricksadql2.jpg

March 12th, 2006, 10:30 PM	#4
JRuckas Grandpa Join Date: Aug 2005 Posts: 1,107	that damn iac... everytime i turn around, someones iac is shot... hey tim(white99stang), how is your iac buddy

March 13th, 2006, 08:54 AM	#5
99mustang232 MM Fanatic 1999 Ford Mustang V6 Join Date: Sep 2005 Location: newport news, va Posts: 3,719	this is why i have a spare sitting in my garage, not to mention it helps troubleshooting it is a worth while investment.

September 11th, 2006, 07:31 PM	#6
98StangGT Newbie Join Date: Jun 2006 Posts: 16	my car does the same thing, did the IAC fix ur prob? or i need to fix mine

September 13th, 2006, 06:21 AM	#7
Beatz Newbie Join Date: Aug 2006 Posts: 14	I REPLACED MINE AND FOR ABOUNT A WEEK IT WAS RUNNING NICE AND SWEET BUT NOW ITS THE SAME THING OVER AND OVER ? ;-/

September 13th, 2006, 07:25 AM

C MY 4D

Black Mamba

2003 Cobra

11.14@124.36

Join Date: Aug 2006

Location: Hampton, VA

Posts: 1,453

vacuum leak

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September 13th, 2006, 01:43 PM

itschristorres8

SP00LIN V6

2000 Mustang V6

unknown @390

Join Date: Aug 2006

Location: south florida

Posts: 14,605

Re: Car Is Cutting Out! Help!

Originally Posted by streetstang06

I need help with my car. The check engine light never came on and every time i turn on any type of air conditioning or heater whether it defrost or vent, my car will cut out. It doesn't do it while i'm actually driving but if i take it out of gear and coast it nearly kills itself. Letting it idle i can hear it drop rpm's really fast but then it catches itself before it dies. It is a 1998 mustang gt. 4.6 L. five speed.

thats sounds pretty damm dangerous

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437rwhp and 402rwtq through a V6 on a stock bottom end

September 13th, 2006, 04:39 PM	#10
98StangGT Newbie Join Date: Jun 2006 Posts: 16	Mines doing the same thing, and I have a 98 mustang GT too, 4.6 5 speed, I replaced MAF, New Plugs, new o2 sensors, new TPS, cleaned my IAC, and previous owner put a new intake manifold, old one was cracked, so I have no clue wat I should try next

September 14th, 2006, 09:17 PM	#11
wolffer Regular Join Date: Aug 2006 Posts: 60	I would try looking for a vacuum leak in the heater control if it has one, I could look at my 97 cobra later,also check and see if the battery power drops when the problem occors,something in the charging system may be messed up. the air conditioner is turned on in defrost but not in vent so you might be able to rule out the compresser, my 97 has the original battery in it and it couldnt start my boat but it starts my car just fine for now and turning on my ac does not kill my engine but it does make my supercharger sound a little sick. use a digital vom and check charging system.

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