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

Engine IDLE ISSUES

  • Thread starter Thread starter Prabh114
  • Start date Start date Mar 29, 2021
P

Prabh114

Member
May 28, 2020
13
3
13
Vancouver CANADA
Mar 29, 2021
#1
  • Mar 29, 2021
  • #1
I swapped my 2.3 to a 5.0 and have a few issues currently
Problem:
High idle/surge causing the engine to shake badly. The whole car shakes. Idles 1000-1500 rpms intermittently.
Solutions:
Smoked tested for vacuum leak and upper intake gasket was leaking. Replaced gasket and smoke tested it again. No vacuum leaks now. Timing is set at 12. TPS is at .76 and won’t go over that.

Heres a link too the video I’ve made.
View: https://youtu.be/AknKXvkkN-4


Everything done to the car:
Da1 computer
88 car, 88 harness, 92 motor
Stock motor
Speed density
Egr deleted
Smog deleted
No A/C


questions i have:
Is the 2.3 ignition coil the same as a 5.0?
Any other steps i can take?
 

General karthief

wonder how much it would cost to ship you a pair
Mod Dude
Aug 25, 2016
27,826
10,507
203
polk county florida
Mar 30, 2021
#2
  • Mar 30, 2021
  • #2
What is the firing order?
What is the tps voltage at wide open throttle? ( not related to ill running issues)
Where did the engine come from?
 

Boostedpimp

20+ Year Stangneter
May 8, 2003
1,451
493
154
NJ
Mar 30, 2021
#3
  • Mar 30, 2021
  • #3
How is the engine mounts?
Look over the harmonic balancer?
Did you try a base idle reset?
 

nickyb

I gotta say i never painted my nuts, Never Ever
15 Year Member
Apr 3, 2009
2,964
1,613
153
nevada
Mar 30, 2021
#4
  • Mar 30, 2021
  • #4
You can ream out the holes in the tps it'll move more and you can get it closer to .98. Doesn't look like too much shaking to me? Once you get the tps close then you can base idle it to where you like it.I know 4 banger coil is not the same but a new one is cheap enough( rockauto),amazon....about $20 usdollars.God luck and post results.
 
Last edited: Mar 30, 2021
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
22
Views
502
Fox 5.0 Mustang Tech Friday at 8:28 PM
KRUISR
B
Engine Strange Noise
  • burntokita
  • May 8, 2026
  • Fox 5.0 Mustang Tech
Replies
8
Views
325
Fox 5.0 Mustang Tech May 11, 2026
keel
Engine Stock TB - smoke test - leaking bad
  • R82148V
  • May 18, 2025
  • Fox 5.0 Mustang Tech
  • 2
Replies
28
Views
1K
Fox 5.0 Mustang Tech Jun 5, 2025
R82148V
J
Emission problems
  • jls.zmmr
  • Feb 5, 2026
  • 1994 - 1995 Specific Tech
Replies
2
Views
208
1994 - 1995 Specific Tech Feb 7, 2026
AeroCoupe
2
Running very very rich
  • 2esoteric
  • Oct 31, 2025
  • Fox 5.0 Mustang Tech
Replies
4
Views
303
Fox 5.0 Mustang Tech Oct 31, 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?