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

Timing not advancing

  • Thread starter Thread starter Bigred86foureye
  • Start date Start date Dec 14, 2019
  • Tags Tags
    351w swap advance foxbody timing
B

Bigred86foureye

Member
Oct 29, 2018
27
1
13
Stafford, Va
Dec 14, 2019
#1
  • Dec 14, 2019
  • #1
Just swapped in a 351w carb Into my 86 foxbody and for some reason the timing isn't advancing under acceleration . It is mildly built. Any help on why this might be happening or what causes this?
 

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
Dec 14, 2019
#2
  • Dec 14, 2019
  • #2
Need to know more about the build/swap, ecu, efi, distributor, that kind of stuff
 
B

Bigred86foureye

Member
Oct 29, 2018
27
1
13
Stafford, Va
Dec 14, 2019
#3
  • Dec 14, 2019
  • #3
351w 670cfm holley street warrior carb, gt40p heads msd ready to run distributor , older 6al box, bbk long tubes, edelbrock air gap rpm intake manifold, sve 3 core radiator and double fan, and cvf pulley system
 
Last edited: Dec 14, 2019

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
Dec 14, 2019
#4
  • Dec 14, 2019
  • #4
Ok, from what I remember about vacuum advance on carb'd cars there are two types, find out what type of advance your distributor uses. It is vacuum advance right?
 
B

Bigred86foureye

Member
Oct 29, 2018
27
1
13
Stafford, Va
Dec 15, 2019
#5
  • Dec 15, 2019
  • #5
General karthief said:
Ok, from what I remember about vacuum advance on carb'd cars there are two types, find out what type of advance your distributor uses. It is vacuum advance right?
Click to expand...
https://www.summitracing.com/parts/msd-8354/
It the msd ready to run billet ignition. Has vacuum advance
 

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
Dec 15, 2019
#6
  • Dec 15, 2019
  • #6
The instructions should show where to plug in the vacuum line to the carb.
MSD Ignition · Customer service

(915) 855-7123
 
B

Bigred86foureye

Member
Oct 29, 2018
27
1
13
Stafford, Va
Dec 15, 2019
#7
  • Dec 15, 2019
  • #7
I was wrong. It's an electrical advance. The box controls it
 
You must log in or register to reply here.

Similar threads

F
Engine 1988 Foxbody idle issues
  • fernandosgarage55
  • Apr 28, 2026
  • Fox 5.0 Mustang Tech
  • 2
Replies
26
Views
402
Fox 5.0 Mustang Tech Apr 30, 2026
AeroCoupe
B
Acceleration Vibration
  • Blown02svt
  • Dec 31, 2025
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
Replies
13
Views
585
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- Jan 5, 2026
General karthief
K
2000 3.8 v6
  • Kinglife2121
  • Nov 2, 2025
  • 1996 - 2004 SN95 Mustang -General/Talk-
Replies
0
Views
95
1996 - 2004 SN95 Mustang -General/Talk- Nov 2, 2025
Kinglife2121
K
F
Difference between 83-86 EFI and 87-97 gas tanks?
  • ForeverDrivin
  • Mar 30, 2026
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
Replies
5
Views
159
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- Mar 30, 2026
ForeverDrivin
F
S
Preparation for Holley Terminator X install – Foxbody 306 (electrical fan, alternator, MSD Ignition, etc)
  • So_Flo
  • Mar 1, 2026
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • 2
Replies
22
Views
1K
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- Mar 4, 2026
General karthief
Share:
Bluesky Email Share Link
  • Mustang Forums
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • Fox 5.0 Mustang Tech
  • Fox Engine Swaparoo
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?