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

Electrical 1990 lx - TFI module failure?

  • Thread starter Thread starter redlxhatch1990
  • Start date Start date Jan 9, 2019
R

redlxhatch1990

Member
Sep 16, 2018
11
2
13
Chicago
Jan 9, 2019
#1
  • Jan 9, 2019
  • #1
Hello everyone,

I had recently solved a bad miss I was having with new livewire 8mm spark plug wires and the performance distributors speadin demon coil. The car was running great until it died on me randomly while driving. I read the the new coil gives a hotter spark and am assuming that caused my tfi module to overheat? If this makes sense to others I will go ahead and replace my tfi module, not sure what else would cause it to die while driving. Has anyone else had this happen after a new coil is installed? I checked all connections and they look solid. I am looking into relocating the tfi module as soon as I get the car back home to avoid a would be 3rd tfi replacement.

Also, I was unable to get the car to start back up. When my last tfi went out it would start up after cooling down for a bit. Can they get completely fried one time and never work again even after cool down?

Thanks in advance!
 

Shakerhood

20+ Year Stangneter
Oct 28, 2004
3,355
207
114
Ohio
Jan 10, 2019
#2
  • Jan 10, 2019
  • #2
I have been trying to locate a few original Motorcraft TFI's to keep as spares, seems like all the aftermarket ones fail.
 

jrichker

StangNet's favorite TOOL
In Remembrance. Thank you for your contributions
Mar 10, 2000
27,512
2,811
234
Dublin GA
Jan 10, 2019
#3
  • Jan 10, 2019
  • #3
@redlxhatch1990

Did you clean the distributor pad where the TFI module mounts and liberally apply the heatsink compound?
 
Reactions: Shakerhood and General karthief

dgollem

20+ Year Stangneter
May 5, 2004
211
33
49
Waldorf MD
Jan 10, 2019
#4
  • Jan 10, 2019
  • #4
Sometimes the PIP sensor in the distributor will fail and cause similar intermittent propblems. Not expensive but a little work to change as you have to pull and disassemble the distributor.
 
R

redlxhatch1990

Member
Sep 16, 2018
11
2
13
Chicago
Jan 10, 2019
#5
  • Jan 10, 2019
  • #5
Thanks for the replies everyone, it was the tfi as i expected. I am going to relocate it for peace of mind.
 
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
547
Fox 5.0 Mustang Tech Jun 5, 2026
KRUISR
W
1993 LX 5.0 dies after ignition parts replacement
  • Warhorse85
  • Aug 16, 2025
  • Fox 5.0 Mustang Tech
  • 5 6 7
Replies
122
Views
3K
Fox 5.0 Mustang Tech Nov 4, 2025
General karthief
1990 Mustang with no-start condition - Fixed and how-to
  • TTSaleen
  • Mar 22, 2026
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
Replies
0
Views
102
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- Mar 22, 2026
TTSaleen
8
Electrical Crank-no start ... no spark ... no injector pulse, was it something I did? (redux)
  • 85gtCOBRA
  • Oct 28, 2025
  • Fox 5.0 Mustang Tech
Replies
2
Views
497
Fox 5.0 Mustang Tech Oct 29, 2025
85gtCOBRA
8
W
  • Locked
Fox Wifes 1993 LX 5.0 dies after replacing ignition parts
  • Warhorse85
  • Aug 16, 2025
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
Replies
9
Views
280
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- Aug 17, 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?