• Mustang Forums
  • 1996 - 2004 SN95 Mustang -General/Talk-
  • SN95 4.6L Mustang Tech

96 to 99 engine swap questions

  • Thread starter Thread starter smenzel444
  • Start date Start date Jun 20, 2006
S

smenzel444

New Member
Jun 10, 2006
4
0
0
Jun 20, 2006
#1
  • Jun 20, 2006
  • #1
I'm planning on puttin a 99 4.6 SOHC in my 96 GT. I notice a couple problems already. I have the complete engine with harness and TB. Any advice would be appreciated.

1. The 99 has the coil on plug setup, can I use this with my cars wiring?

2. The fuel rail doesn't have a return, it has an electronic regulator or something on the left bank. What do I do with my original return line?

I was thinking of just using my 96 fuel rails, but then what will happen with the electronic regulator plug?

I could also use my 96 coils and harness, but I see some other differences in the wiring on the 99.

I think I'll quit now and let some of you experts tell me what's up.

Thanks a ton.
 

squares98

Member
Aug 20, 2004
852
0
17
Orange,ca
Jun 20, 2006
#2
  • Jun 20, 2006
  • #2
search
but yes you reuse your coil packs, and fuel rails
 

Gearbanger 101

Straight Outta Locash
20+ Year Stangneter
Aug 10, 2002
9,457
1,377
234
Ontario, Canada
Jun 20, 2006
#3
  • Jun 20, 2006
  • #3
Transfer all the stuff from your '96 engine over to the '99 long block. Don't bother trying to incorporate the COP set up or return less fuel system to your current set up. There's no advantage to it.
 

CanadaStang

New Member
Sep 7, 2003
2,093
1
0
Mb
Jun 20, 2006
#4
  • Jun 20, 2006
  • #4
You'll also need to tap the aluminum cross-over on the intake for the second temp sensor. If you don't have the aluminum cross-over, or you don't want to remove it to get it tapped, look on the side of the block for a plug that you can remove and screw the sensor in. Some people [I can't seem to think of who it was ] use a T fitting in the one provided sensor hole and then screw the two sensors into it.
 
You must log in or register to reply here.

Similar threads

Resolved Holley terminator integration into CCRM
  • BrandonMP
  • Feb 25, 2026
  • SN95 4.6L Mustang Tech
Replies
1
Views
237
SN95 4.6L Mustang Tech Feb 27, 2026
BrandonMP
C
99 mustang gt no signal to fire coils
  • Cerana04
  • Oct 4, 2025
  • SN95 4.6L Mustang Tech
Replies
0
Views
127
SN95 4.6L Mustang Tech Oct 4, 2025
Cerana04
C
E
Chasing Vacuum leak 99 GT
  • EBNS_2005
  • May 2, 2026
  • 1996 - 2004 SN95 Mustang -General/Talk-
Replies
2
Views
141
1996 - 2004 SN95 Mustang -General/Talk- May 3, 2026
X-cam34
X
M
Help! 2003 GT misfire when hot
  • Modular03
  • Feb 10, 2026
  • SN95 4.6L Mustang Tech
Replies
4
Views
362
SN95 4.6L Mustang Tech Feb 13, 2026
Mustang5L5
Electrical/engine bay harness questions
  • djj62478
  • May 29, 2026
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
Replies
7
Views
224
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- Jun 6, 2026
djj62478
Share:
Bluesky Email Share Link
  • Mustang Forums
  • 1996 - 2004 SN95 Mustang -General/Talk-
  • SN95 4.6L 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?