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

Surging issue

  • Thread starter Thread starter 3StrokedBLOWN06
  • Start date Start date Apr 25, 2009
3

3StrokedBLOWN06

New Member
Apr 23, 2009
1
0
0
Apr 25, 2009
#1
  • Apr 25, 2009
  • #1
I have an 86 capri 5.0 and I hit a bump, after that I noticed a surging problem (which has been off and on for a while) come back.. Before this I always cleaned/replaced IAC.It used to fix the problem. But this time I tried cleaning the IAC,TPS, and the throttle body, Ive replaced spark plugs, cleaned the distributor cap, tested the IAC by unplugging it and seeing if the idle drops (it does), checked for leaks (dont know how good of a job I did), and the car still wont idle right. When first starting it idles at about 3000 for 2 seconds then goes down to 650. Then if I drive it normal it stays at 650. but if I punch it, it drops to 0, then up to 500.It is surging the whole time. The car has died twice and I cant figure out what the hell its doing. Sorry about the long post I just have no idea how to fix this.
Im getting desperate. lol
 

BlownFiveLiter

have car, will race....wait, it doesn't run
15 Year Member
Nov 29, 1999
3,133
18
108
Chicagoland
Apr 25, 2009
#2
  • Apr 25, 2009
  • #2
I moved your post out of the Surging Idle Checklist thread, since that one's more meant to serve as a guide to fixing surging issues, not so much for asking questions in. Start with the first post in that thread and follow it along, step by step. It will very likely contain the solution to your idle issue.
 
You must log in or register to reply here.

Similar threads

C
Engine Idle cuts out
  • claypoolxx
  • Mar 7, 2026
  • Fox 5.0 Mustang Tech
  • 2
Replies
20
Views
468
Fox 5.0 Mustang Tech Saturday at 5:11 PM
alutwon
Engine Surging idle on start-up
  • keel
  • Aug 11, 2025
  • Fox 5.0 Mustang Tech
Replies
16
Views
747
Fox 5.0 Mustang Tech Oct 31, 2025
keel
7
Engine Random hanging idle
  • 706 Saleen
  • Feb 11, 2026
  • Fox 5.0 Mustang Tech
Replies
9
Views
422
Fox 5.0 Mustang Tech Feb 19, 2026
86HO5.0
8
B
Engine Strange Noise
  • burntokita
  • May 8, 2026
  • Fox 5.0 Mustang Tech
Replies
8
Views
321
Fox 5.0 Mustang Tech May 11, 2026
keel
Dies at start up, mild surge
  • Dontknowchit
  • May 15, 2025
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • 2
Replies
20
Views
733
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- Jun 9, 2025
Noobz347
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?