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

efi idling problems

  • Thread starter Thread starter '88WhtNtchBck$
  • Start date Start date Sep 23, 2007
8

'88WhtNtchBck$

New Member
Aug 17, 2007
33
0
0
Jersey
Sep 23, 2007
#1
  • Sep 23, 2007
  • #1
any advise to fix my idle? My car was apart for awhile and now it idles high, i bought a new iacv and tps, but it still idles at like 1500 rpms, sometimes when i'm sitting at a light it comes back down but then it seems to be too low,
 

BK_CAULEY

it's built for speed not longevity, woman
Dec 26, 2006
0
10
49
Thomasville, ga
Sep 23, 2007
#2
  • Sep 23, 2007
  • #2
that sounds like a vaccum leak to me. make sure you have on all the proper gaskets when installing new parts. and check for work or cracked vaccum lines.

this should help you locate the lines for inspection.


if no lines are broke or cracked and you cant find a leak. see the surging idle checklist.

http://forums.stangnet.com/showthread.php?t=698148
 

Attachments

  • mustangFoxFordVacuumDiagram.webp
    37.3 KB · Views: 128

jrichker

StangNet's favorite TOOL
In Remembrance. Thank you for your contributions
Mar 10, 2000
27,512
2,811
234
Dublin GA
Sep 23, 2007
#3
  • Sep 23, 2007
  • #3
See "Surging Idle Checklist for help with all your idle/stall problems. The first two posts contain all the updates to the fixes. I continue to update it as more people post fixes or ask questions.
 
You must log in or register to reply here.

Similar threads

7
Engine Random hanging idle
  • 706 Saleen
  • Feb 11, 2026
  • Fox 5.0 Mustang Tech
Replies
9
Views
426
Fox 5.0 Mustang Tech Feb 19, 2026
86HO5.0
8
F
Engine 1988 Foxbody idle issues
  • fernandosgarage55
  • Apr 28, 2026
  • Fox 5.0 Mustang Tech
  • 2
Replies
26
Views
400
Fox 5.0 Mustang Tech Apr 30, 2026
AeroCoupe
D
Engine Throttle sticky even after cable replacement
  • dqureshi06
  • Aug 16, 2025
  • Fox 5.0 Mustang Tech
Replies
6
Views
296
Fox 5.0 Mustang Tech Aug 17, 2025
AeroCoupe
Engine Surging idle on start-up
  • keel
  • Aug 11, 2025
  • Fox 5.0 Mustang Tech
Replies
16
Views
750
Fox 5.0 Mustang Tech Oct 31, 2025
keel
8
Engine Rough idle and aggressive sputtering when accelerating
  • 88vertible
  • Aug 13, 2025
  • Fox 5.0 Mustang Tech
Replies
4
Views
1K
Fox 5.0 Mustang Tech Dec 13, 2025
Jarhead67
J
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?