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

Foxbody is possessed and will only fire up sometimes help

  • Thread starter Thread starter AJTunno
  • Start date Start date May 8, 2023
  • Tags Tags
    5.0 ecm computer problems foxbody ignition no spark problem
Prev
  • 1
  • 2
First Prev 2 of 2

Noobz347

Stangnet Facilities Maint Tech... Er... Janitor
Admin Dude
Jan 4, 1985
43,093
21,276
234
Box behind Walmart
Jun 5, 2023
#21
  • Jun 5, 2023
  • #21
Somebody should drop that dude a line and have him make an account and post here:

Services - Tuning, Welding, Mechanic, Body Work...

Personal Services Provided / Help Wanted
stangnet.com
 
Last edited: Jun 5, 2023
Reactions: General karthief

rednotch

I'd like to remain having one chocolate starfish
Founding Member
Aug 14, 2000
1,387
621
143
south jersey
Jun 5, 2023
#22
  • Jun 5, 2023
  • #22
He does alot of truck ecu's. Ain't just the fox body stuff craping out these days from age, he doesn't even have the fox stuff listed on his site or ebay page but can do them, there simple compared to newer multi layer boards..
 
A

AJTunno

Member
Jan 21, 2016
19
4
13
Jun 28, 2023
#23
  • Jun 28, 2023
  • #23
So I replaced all the caps and still nothing. It'll fire every now and then and with the spout out it'll stay on sometimes for a few seconds then die. Fuel pump primes when key on like it's supposed to. The sounds in the video on the initial post are the injectors firing and the coil will randomly fire too and it still does this with the key on randomly sometimes. I'm gonna try a different computer and maybe a new distributor thinking the pip sensor is bad but I really don't know at this point any other suggestions are appreciated
 

rednotch

I'd like to remain having one chocolate starfish
Founding Member
Aug 14, 2000
1,387
621
143
south jersey
Jun 28, 2023
#24
  • Jun 28, 2023
  • #24
Did you test the circuits... Just putting new caps on a board if you don't know what your doing or how to test the basic ecu functions isnt the best idea. from the pic your posted of the bad cap I'd expect the trace pad to be pretty trashed under the coating. Better off sending that in for repair.
 
Reactions: limp
A

AJTunno

Member
Jan 21, 2016
19
4
13
Jun 28, 2023
#25
  • Jun 28, 2023
  • #25
rednotch said:
Did you test the circuits... Just putting new caps on a board if you don't know what your doing or how to test the basic ecu functions isnt the best idea. from the pic your posted of the bad cap I'd expect the trace pad to be pretty trashed under the coating. Better off sending that in for repair.
Click to expand...
I'll probably send it in then. I'll research how to test the computer as well but the bottom 2 caps have 5v on the positive side with the key on and the top one has 12v and there's continuity on all the negatives of the caps. Could the pad still be bad even though I'm getting voltage there? I might be able to get my hands on a spare computer so I'm going to try that as well
 

AeroCoupe

lube between the nut and the face. I know my lubes
Founding Member
Oct 28, 2001
5,886
4,010
183
Claremore, OK
Jun 28, 2023
#26
  • Jun 28, 2023
  • #26
If you can get your hands on a known working EEC than that will answer all your questions with regards to your old one. If it were me I would be full press on going this route as it puts to rest whether or not the existing EEC is good or bad and if it needs to be repaired or not.
 
Reactions: limp
A

AJTunno

Member
Jan 21, 2016
19
4
13
Jul 11, 2023
#27
  • Jul 11, 2023
  • #27
Update... I was able to get a a9p out of a running car and the car fired right up. I'm not sure what else was wrong with the other computer or if I somehow did the capacitors incorrectly but the car runs again. Thanks guys for the help
 
Reactions: General karthief, AeroCoupe and limp

Mindseye007

10 years still blowing strong
5 Year Member
Oct 21, 2020
579
135
63
ontario
Apr 22, 2024
#28
  • Apr 22, 2024
  • #28
Noobz347 said:
Somebody should drop that dude a line and have him make an account and post here:

Services - Tuning, Welding, Mechanic, Body Work...

Personal Services Provided / Help Wanted
stangnet.com
Click to expand...
Yes and ditch that annoying piano playing in the background.
 
Prev
  • 1
  • 2
First Prev 2 of 2
You must log in or register to reply here.

Similar threads

B
No spark. 1990 foxbody 5.0 gt
  • Boogi
  • Nov 16, 2025
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
Replies
0
Views
187
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- Nov 16, 2025
Boogi
B
S
Help! No fire!
  • Shawn42850
  • Oct 22, 2022
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
Replies
3
Views
1K
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- Nov 10, 2022
DerrickOlley
D
L
Engine 97 mustang gt manual weird idol when off the throttle and coasting in 3rd, 4th, or 5th
  • Lanezs
  • Jun 9, 2023
  • SN95 4.6L Mustang Tech
Replies
3
Views
2K
SN95 4.6L Mustang Tech Dec 20, 2023
Yel2002GTAuto
Y
Engine A ton of codes
  • Andresquintana.mma
  • Aug 2, 2021
  • Fox 5.0 Mustang Tech
Replies
7
Views
1K
Fox 5.0 Mustang Tech Aug 4, 2021
Andresquintana.mma
A
Engine 1990 Fox wont rev over 3500 RPMS
  • alex.sweitzer
  • Oct 27, 2020
  • Fox 5.0 Mustang Tech
  • 2 3
Replies
57
Views
14K
Fox 5.0 Mustang Tech Mar 21, 2021
alex.sweitzer
A
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?