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

Hard Missfire Problems!

  • Thread starter Thread starter 97venom
  • Start date Start date Oct 7, 2009
9

97venom

New Member
Apr 28, 2009
3
0
0
West Des Moines, IA
Oct 7, 2009
#1
  • Oct 7, 2009
  • #1
standard bore 302, MSD ignition, GT40 heads, Vortech S1 supercharer with 8 lb pulley, Edelbrock intake, BBK 75mm throttle body, BBK shorty headers, Flowmaster pipes, i think e303 cam, 42# injectors, 255 T-Rex fuel pump

Tranny: t5, short shifter, 4.10 rear gears, King Cobra clutch

Suspension: BBK shocks, BBK 2" lowering springs, BBK sway bars

This is all on a 92 gt just got the car bought it with a hard missfire. It has msd btm and Boost retard control. I think that it could be as simple as a bad coil but just drove it home tonight and thought I'd see if anyone had any thoughts.... I've never really messed with btm I'm fairly certain that is a spark issue and not a fuel problem. runs fine at idle but under load especially after 1st gear it acts like it looses all spark like it dies for a second. Maybe a computer issue??? Any thoughts would be great thanks for taking the time to read!
 

liljoe07

5 Year Member
Feb 18, 2009
1,622
363
124
Cartersville,Ga
Oct 7, 2009
#2
  • Oct 7, 2009
  • #2
Whats the plug gap set at?
 

Dino Dino Bambino

15 Year Member
Jun 13, 2007
1,670
87
79
Cyprus
Oct 8, 2009
#3
  • Oct 8, 2009
  • #3
Hard Missfire Problems!
Click to expand...

Sounds like Miss Fire needs to meet Mr. Fire.
Seriously, I think you have an ignition problem especially if the tach needle jumps around as the engine misfires. You could try swapping your stock ignition back in place of the MSD. Remember the adage MSD = My Spark Died
 

Celeb

20+ Year Stangneter
Sep 8, 2002
736
13
59
Here and there
Oct 8, 2009
#4
  • Oct 8, 2009
  • #4
What's your timing set at?
 
You must log in or register to reply here.

Similar threads

A
95 Gt intermittent backfire
  • A_A_Ron
  • May 26, 2025
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
Replies
0
Views
393
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- May 26, 2025
A_A_Ron
A
A
SOLD For Sale: 1993 Ford Mustang Cobra Modified
  • anjteal93
  • Sep 5, 2025
  • Fox Body Mustangs For Sale (1979-93)
Replies
13
Views
1K
Fox Body Mustangs For Sale (1979-93) Oct 26, 2025
Mindseye007
Progress Thread Progress Thread- From6to8's 95 GT/Saleen Supercharged 331 install
  • from6to8
  • Mar 22, 2026
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • 2
Replies
24
Views
712
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- May 6, 2026
from6to8
Engine 1990 LX 5.0L EFI Mustang Fuel Management Problems - HELP!
  • 5.0LXStanger
  • May 25, 2025
  • Fox 5.0 Mustang Tech
  • 2 3
Replies
45
Views
2K
Fox 5.0 Mustang Tech Jul 11, 2025
5.0LXStanger
Fuel AFR is driving me nuts
  • BotchedNotch
  • Mar 22, 2024
  • Fox 5.0 Mustang Tech
Replies
4
Views
924
Fox 5.0 Mustang Tech Jun 7, 2024
CAMTWO1070
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?