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

Motor shuts down under boost

  • Thread starter Thread starter QUIKSVT
  • Start date Start date Jul 15, 2006

QUIKSVT

New Member
May 19, 2006
93
0
0
Jul 15, 2006
#1
  • Jul 15, 2006
  • #1
I have a 95 Cobra, stock motor. S-trim w/ FMU and the stock 24 lb. injectors with the inline pump Vortech supplied. The stock pulley, 3.3" I believe produces 5.5-6 psi and the car runs fine, feels rich to me. Sooo, a friend of mine loaned me a smaller pulley. I think its 2.75" give or take. I bolted it on, drove the car. It showed about 8.5 psi the ONE time it made a good pull. The rest of the time, it would get into boost and I think the computer was cutting the ignition. Motor shuts down, CEL flashes on for a second and as soon as you let out of it, it comes right back to normal. Like the computer intermittantly just cut ignition/fuel or both. Any ideas? I know people run 8-9 psi with no tune and an FMU without problems, and the 24 lb injectors SHOULD be alright up to that point. Could the FMU be increasing fuel pressure too much? Is the computer not understanding whats happening?
 
You must log in or register to reply here.

Similar threads

X
VE Table Not Dialed? Send Me Your Datalog.
  • X-cam34
  • Feb 8, 2026
  • Digital Self-tuning Forum
  • 2 3
Replies
49
Views
1K
Digital Self-tuning Forum May 1, 2026
X-cam34
X
1
Engine Motor swap from a 2003 Explorer
  • 1996mustang new
  • Oct 9, 2025
  • SN95 4.6L Mustang Tech
Replies
7
Views
517
SN95 4.6L Mustang Tech Oct 16, 2025
squeak93
J
Engine No power after idle
  • JustinTilley86
  • Aug 10, 2024
  • Fox 5.0 Mustang Tech
  • 2
Replies
34
Views
2K
Fox 5.0 Mustang Tech Sep 23, 2024
General karthief
0
V6 to V8 Swap info
  • 02_2v_Curtis
  • Jan 11, 2026
  • 1996 - 2004 SN95 Mustang -General/Talk-
Replies
0
Views
571
1996 - 2004 SN95 Mustang -General/Talk- Jan 11, 2026
02_2v_Curtis
0
Progress Thread Progress Thread- From6to8's 1994 Cobra Supercharger install
  • from6to8
  • Sep 25, 2025
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • 20 21 22
Replies
420
Views
9K
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- May 6, 2026
from6to8
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?