• Mustang Forums
  • 1996 - 2004 SN95 Mustang -General/Talk-

Auto-to-manual Conversion Idling Problem (t5 Swap)

  • Thread starter Thread starter NandoGT
  • Start date Start date Dec 26, 2014
N

NandoGT

New Member
Dec 26, 2014
1
0
1
Dec 26, 2014
#1
  • Dec 26, 2014
  • #1
Just got back my 01 gt from getting a manual swap done and I am having idling problems.
On a cold start, the engine will start and rev up to 2000rpm by itself and die as the rpm's drop unless i add a little bit of gas. After doing this just once, the car won't die but will proceed to rev up to 1000rpm (It cycles after around every 20 seconds). As far as everything else goes, no issues just having this idling problem.
I figure that it could be that I just need a tune but wanted to get some input on it before having to spend $300-400 on a tuner.
Also Yes, I did swap everything including the ECU.




Any help appreciated guys, opened an account here to hopefully get some opinions from others that have done these swaps before.
 

Master baiter

Member
Dec 26, 2014
46
3
8
texas
Dec 31, 2014
#2
  • Dec 31, 2014
  • #2
Was it a used ecu or a new one? May just need the computer flashed. Been thinking of doing same swap and have heard rumors that you can have ford flash the auto computer to work. I would check and start there first. Being as it started after the swap I would lean more that way then thinking of a censor.
 
You must log in or register to reply here.

Similar threads

B
Stuck
  • bshipley
  • Aug 27, 2026
  • 1996 - 2004 SN95 Mustang -General/Talk-
Replies
1
Views
118
1996 - 2004 SN95 Mustang -General/Talk- Aug 28, 2026
squeak93
D
Yet another v8 swap
  • dulcimerbob
  • Sep 19, 2026
  • 1974 - 1978 Mustang II Talk & Tech
  • 3 4 5
Replies
87
Views
2K
1974 - 1978 Mustang II Talk & Tech Wednesday at 8:33 PM
dulcimerbob
D
M
01 mustang 3.8 fuel pressure issue
  • Mhaley2006
  • May 29, 2026
  • 1996 - 2004 SN95 Mustang -General/Talk-
Replies
4
Views
440
1996 - 2004 SN95 Mustang -General/Talk- Aug 9, 2026
JohnKay
J
S
Need help asap
  • shaggyman65
  • Dec 24, 2025
  • 1996 - 2004 SN95 Mustang -General/Talk-
Replies
2
Views
299
1996 - 2004 SN95 Mustang -General/Talk- Dec 24, 2025
shaggyman65
S
F
Fox 1990 Mustang GT 5.0 A9L – Engine suddenly shuts off but immediately restarts when key turned
  • FishermansFriend
  • Aug 9, 2026
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
Replies
16
Views
609
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- Aug 30, 2026
General karthief
Share:
Bluesky Email Share Link
  • Mustang Forums
  • 1996 - 2004 SN95 Mustang -General/Talk-
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?