idle help - MustangForums.com


Go Back   MustangForums.com > Ford Mustang Tech > 4.6L (1996-2004 Modular) Mustang
Search


4.6L (1996-2004 Modular) Mustang Technical discussions on 1996-2004 4.6 Liter Modular Motors (2V and 4V) within.

idle help

Reply
 
 
 
Thread Tools Search this Thread
Old 03-10-2016, 03:29 PM   #1
spencerlozeau@comcast.net
 
Join Date: Mar 2016
Vehicle: 2004,ford,mustang GT
Location: new hampshire
Posts: 3
Default idle help

hello i could use your help figuring out my idle issue, my rpms drop down every 8+/- secs and lasts about 12+/- secs. i have talked to some people who think it might be my idle air valve, but a new symptom has occurred that is throwing me for a loop, it is now squeaking at the same time, the squeaking gets gradually louder over the 12 secs then stops completely for 8 and so on. so rpms drop and squeaking, any ideas? F.Y.I squeaking sounds like the belt area not up at the valve, this is why i ask...
spencerlozeau@comcast.net is offline   Reply With Quote
Old 03-10-2016, 04:02 PM   #2
Z28KLR
4th Gear Member
 
Z28KLR's Avatar
 
Join Date: Nov 2009
Vehicle: 2001 GT
Location: SoCal
Posts: 1,305
Default

Does this idle condition coincide with having the hvac settings on either A/C or Defroster?

Every time the compressor cycles on and off it places/reduces load on the engine and under those circumstances a slight fluctuation in idle speed is normal. The squeaking would likely be the serpentine belt, and could be due to either the belt itself needing replacement or the tensioner pulley is faulty.
__________________
__________________________________________

2001 Laser Red GT convertible; all of the usual bolt-ons.

1967 Notch; 200 I-6, C4 auto.
Z28KLR is offline   Reply With Quote
Old 03-10-2016, 04:16 PM   #3
spencerlozeau@comcast.net
 
Join Date: Mar 2016
Vehicle: 2004,ford,mustang GT
Location: new hampshire
Posts: 3
Default

i did have the air on but not the A/C, but i did notice a good amount of condensation build up on the A/C lines under the hood which i thought was weird since the A/C was off? Also the belt is pretty new and looks in good condition and if the pulley was going bad wouldn't the squeaking be a pretty continuous thing? it only squeaks when rpms drop...
spencerlozeau@comcast.net is offline   Reply With Quote
Old 03-10-2016, 04:56 PM   #4
WJL
2nd Gear Member
 
WJL's Avatar
 
Join Date: Feb 2013
Vehicle: 1998 Ford Mustang
Location: PA
Posts: 342
Default

IAC or vacuum leak
WJL is offline   Reply With Quote
Old 03-10-2016, 05:08 PM   #5
spencerlozeau@comcast.net
 
Join Date: Mar 2016
Vehicle: 2004,ford,mustang GT
Location: new hampshire
Posts: 3
Default

any tips to troubleshooting that?
spencerlozeau@comcast.net is offline   Reply With Quote
Old 03-11-2016, 08:02 AM   #6
dawson1112
5th Gear Member
 
Join Date: Jul 2012
Vehicle: 1990 lx hatch 5.0
Location: ohio
Posts: 3,199
Default

Sounds like you had the defrost selected, selecting defrost turns the AC compressor on and off in intervals. This is to ensure that during winter months the compressor doesn't seize up from not being used.

The squeaking is most likely due to needing a new belt or it may be have a little moisture on it , it squeaks when the extra load of the compressor is kicked on.


FYI,,, my 00 gt idle will do the same thing when the defrost is selected, minus the squeaking.
__________________
dawson1112 is offline   Reply With Quote

 
 
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
2006 GT Automatic Transmission Issues grippn 2005-2014 Mustangs 6 03-16-2016 02:09 PM
MAC Equal Length shorty header fitment issue, anybody else experienced this? DanHS 5.0L (1979-1995) Mustang 2 03-12-2016 09:57 PM
2013 5.0 idle and exhaust issues. KobraKommander13 5.0L V8 Technical Discussions 2 03-07-2016 12:47 PM
2002 V6 Mustang EGR Valve and DPFE Sensor Problem dahellwitu V6 (1994-2004) Mustangs 2 03-05-2016 07:50 AM
We have a prototype exhaust cutout we would like your opinion on. exhaustfreak New Member Area 0 03-03-2016 08:36 PM


Tags
idle drop, idle issue, idle problem, idle squeaking

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump

 

All times are GMT -5. The time now is 08:48 AM.



This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. FordŽ is a registered trademark of the Ford Motor Company