weird idle question

davidstivers09 · March 3rd, 2011, 08:40 PM

Occasionally when I start my car it will idle weird, it'll keep going up and down, but it won't ever shut off it stays running, once I get going it goes away, most of the time it starts and idles like normal, it only does it every once in a while, in suggestions on what could be causing this?

SALEEN961 · March 4th, 2011, 08:37 AM

Mine will idle up and down too. It doesn't do it all the time but when it does it starts like someone flipped a switch and lopes from 600rpm to 900rpm. I think my car just wants to pretend it's cammed every now and then, but in all seriousness I do wonder what causes it. BTW my car is also a '99.

Is anyone else having this problem?

Tang Stang · March 4th, 2011, 08:49 AM

Probably a slightly "gunked up" IAC or a dirty MAF. It wouldn't hurt to clean both of those.

Nito2v · March 4th, 2011, 02:56 PM

Mine idles like that with the heater on.. around 1000-1100 then goes down to 800rpms and stays there. :shrugs

austintylerr · March 4th, 2011, 04:19 PM

Originally Posted by SALEEN961

Mine will idle up and down too. It doesn't do it all the time but when it does it starts like someone flipped a switch and lopes from 600rpm to 900rpm. I think my car just wants to pretend it's cammed every now and then, but in all seriousness I do wonder what causes it. BTW my car is also a '99.

Is anyone else having this problem?

Mine started doing this last week, and I was actually about to post a thread when I seen this one.
I'm gonna clean my MAF and IAC and I'll let you know if it makes a difference

davidstivers09 · March 6th, 2011, 11:22 AM

I'm going to do the same, and I will also post my results.

zinsavage123 · March 6th, 2011, 11:25 AM

maf or do a tune0up if you havnt already

Rich J · March 6th, 2011, 11:29 AM

Usually you have to clean the IAC a couple times for it to take affect.

Oh and make sure you use MAF cleaner, I don't want to see a thread about your car being weird because you used TB cleaner on a MAF.

It happens.

March 3rd, 2011, 08:40 PM	#1
davidstivers09 Enthusiast 1999 Mustang v6 Join Date: Mar 2010 Location: Indiana Posts: 967 iTrader: 0 reviews	weird idle question Occasionally when I start my car it will idle weird, it'll keep going up and down, but it won't ever shut off it stays running, once I get going it goes away, most of the time it starts and idles like normal, it only does it every once in a while, in suggestions on what could be causing this? __________________ *"I'm a boy who appreciates a good body, regardless of the make."*

March 4th, 2011, 08:49 AM	#3
Tang Stang Hardcore Enthusiast 2004 Mustang GT Join Date: Sep 2010 Location: Imperial, MO Posts: 1,961 iTrader: 2 reviews	Probably a slightly "gunked up" IAC or a dirty MAF. It wouldn't hurt to clean both of those. __________________ Rod @ AzzKicker Cars 2004 Ford Mustang GT-The Driver-BBK CAI, PP TB & Inlet, Steeda UD's, SLP LM1, & 3.73's. 1990 Mercury Cougar XR7-The Meth Addict-5.0L DOHC Stroker w/2.1L KB SC. 1995 Ford F150-Mud Toy-5.0L, 4x4, 33's, & Warn 8274 Winch

March 4th, 2011, 02:56 PM	#4
Nito2v Formally Ur PaNic 2002 Mustang GT 4.6L Join Date: Nov 2010 Location: Pennsylvania Posts: 1,576 iTrader: 3 reviews	Mine idles like that with the heater on.. around 1000-1100 then goes down to 800rpms and stays there. :shrugs __________________ 2002 Ford Mustang 4.6 GT Coupe 4-spd Awesomatic - B&M Hammer - Procharger P1sc - 3 Core Intercooler - SCT Xcal3 - SSS Terminators DGR / Dave Guy Tuned 354 rwhp / 365 rwtq

March 6th, 2011, 11:22 AM	#6
davidstivers09 Enthusiast 1999 Mustang v6 Join Date: Mar 2010 Location: Indiana Posts: 967 iTrader: 0 reviews	I'm going to do the same, and I will also post my results. __________________ *"I'm a boy who appreciates a good body, regardless of the make."*

March 6th, 2011, 11:25 AM	#7
zinsavage123 Hardcore Enthusiast 2001 Mustang GT 12.33@111.23mph Join Date: Aug 2008 Location: baltimore, md Posts: 1,422 iTrader: 3 reviews	maf or do a tune0up if you havnt already __________________ 2001 Mustang GT - mods+pics in garage, tuned by matt@performance evolution 1996 Civic DX - my dd

March 4th, 2011, 08:37 AM	#2
SALEEN961 Regular 1999 V6 Mustang Join Date: Feb 2011 Location: Wayne, PA 19087 Posts: 270 iTrader: 0 reviews	Mine will idle up and down too. It doesn't do it all the time but when it does it starts like someone flipped a switch and lopes from 600rpm to 900rpm. I think my car just wants to pretend it's cammed every now and then, but in all seriousness I do wonder what causes it. BTW my car is also a '99. Is anyone else having this problem?

March 6th, 2011, 11:29 AM	#8
Rich J I'm doing it wrong 04 Grand Cherokee Join Date: Mar 2010 Location: South Eastern, Mass Posts: 5,211 iTrader: 0 reviews	Usually you have to clean the IAC a couple times for it to take affect. Oh and make sure you use MAF cleaner, I don't want to see a thread about your car being weird because you used TB cleaner on a MAF. It happens. __________________ Formerly known as Demon_54 "I feel the same way about disco as I do about herpes." - Hunter S. Thompson

Remove Advertisements Sponsored Links
Ford Mustang Forum Advertisement

Threads Similar to: weird idle question
Thread	Thread Starter	Forum	Replies	Last Post
Weird idle?	-2002GTMustang-	99-04	4	January 25th, 2011 11:05 PM
weird idle..	1987mustanggt	5.0 Mustangs	1	December 19th, 2010 07:38 PM
weird idle	fordrangerguy	5.0 Mustangs	5	July 9th, 2009 09:48 PM
weird idle.	energiesource	99-04	9	June 1st, 2009 08:21 PM
Weird Idle problem	geolebon	99-04	17	February 17th, 2007 09:10 PM

All times are GMT -4. The time now is 07:03 PM.
Contact Us - Modded Mustangs : Ford Mustang Forums - Privacy Statement - Top
Modded Mustangs is ©2005-2008, All Rights Reserved, And is Not Affiliated with Ford Motor Company. Forum is powered by vBulletin ©2000 - 2012, Jelsoft Ent. Ltd. & SEO by vBSEO 3.3.2 ©2009, Crawlability, Inc.