• Mustang Forums
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • Fox 5.0 Mustang Tech

90 Idle Problems

  • Thread starter Thread starter fastLX50
  • Start date Start date May 12, 2012
F

fastLX50

New Member
Jan 12, 2002
3
0
1
ohio
May 12, 2012
#1
  • May 12, 2012
  • #1
Ok here is what i have been dealing with. When i start the car sometimes it idles fine and then sometimes all of a sudden it will race up to 2000 RPM on its own. When i disconnect the IAC idles fine, as soon as i plug it back in idle races up again. I have two IAC valves tried them both and they both do it.
checked the TPS voltage and is good.
Any thoughts.
 

jrichker

StangNet's favorite TOOL
In Remembrance. Thank you for your contributions
Mar 10, 2000
27,512
2,813
234
Dublin GA
May 12, 2012
#2
  • May 12, 2012
  • #2
Checklist”[/URL][/u] [/b]for help with all your idle/stall problems. You can guess at the problem and throw parts at it, or you can use the checklist to help you find the problem quickly and inexpensively. The checklist is right here in the Stangnet 5.0 Tech forum and you don’t have navigate to some other unknown web site. It‘s free and doesn’t cost anything: at last count there were more than 103,000 visits and still climbing

The quick and easy way to dump the codes is in there too, and all you need to do it is a paper clip! The first two posts contain all the fixes & updates. At last count there were 24 possible causes and fixes for surging idle/stall problems. I continue to update it as more people post fixes or ask questions.
 
You must log in or register to reply here.

Similar threads

J
Engine Stalling
  • josh40tay
  • Oct 20, 2026
  • Fox 5.0 Mustang Tech
Replies
4
Views
192
Fox 5.0 Mustang Tech Oct 21, 2026
JD1964
7
Engine Random hanging idle
  • 706 Saleen
  • Feb 11, 2026
  • Fox 5.0 Mustang Tech
Replies
9
Views
815
Fox 5.0 Mustang Tech Feb 19, 2026
86HO5.0
8
P
Fuel New Eldebrock 1406 problems 1985 GT 5.0
  • Paddyman
  • Oct 22, 2026
  • Fox 5.0 Mustang Tech
Replies
4
Views
160
Fox 5.0 Mustang Tech Monday at 5:18 AM
manicmechanic007
G
Idle surging after warm up
  • GALLY3309
  • Jun 10, 2026
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
Replies
1
Views
239
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- Jun 10, 2026
Noobz347
S
Mach 1 iac valve in a 4.6 gt
  • solodriverz
  • Jun 3, 2026
  • SN95 4.6L Mustang Tech
Replies
1
Views
159
SN95 4.6L Mustang Tech Jun 5, 2026
squeak93
Share:
Bluesky Email Share Link
  • Mustang Forums
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • Fox 5.0 Mustang Tech
Menu
Log in

Register

  • Forums
  • What's new
  • Media
  • Resources
  • Contact
  • Sponsor
X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?

X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?