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

check engine light

  • Thread starter Thread starter old_blue
  • Start date Start date Jan 21, 2004

old_blue

15 Year Member
Nov 3, 2003
1,783
282
124
Jan 21, 2004
#1
  • Jan 21, 2004
  • #1
Will a check engine light NOT come on when something is wrong? I have an 89 GT, if I dont run it for a week or 2 then it has problems firing and almost seems like I have the firing order wrong which I know is correct. Then when it does start and I step on the gas there is a decent size hesitation. The check engine light does not come on, but will it throw error codes anyways??

Also, if I run the car everyday or run it every other day it runs fine and fires up fine. I wanted to say fuel pump or something to do with the fuel but I guess it could be spark too. I am going to tune her up in the near future after I get her registered just wanted to know if anyone might have any ideas??
 
1

1hot5.0

Founding Member
Sep 6, 2002
1,615
0
0
Surprise, Arizona
Jan 21, 2004
#2
  • Jan 21, 2004
  • #2
Check your ignition timing. Set it at 10* so you can get it running. Next clean your maf sensor. Then I would check your tps voltage, and finally reset your computer. I would definitly do that tuneup as quick as you can.

As far as the check engine light not going on, you still should be able to recieve codes from the computer. RESET YOUR BATTERY AFTER YOU PULL CODES.
 

old_blue

15 Year Member
Nov 3, 2003
1,783
282
124
Jan 21, 2004
#3
  • Jan 21, 2004
  • #3
Kewl thanks!
 
You must log in or register to reply here.

Similar threads

R
Electrical 1987 Map Light
  • Riley Barth
  • May 30, 2026
  • Fox 5.0 Mustang Tech
Replies
8
Views
254
Fox 5.0 Mustang Tech Jul 6, 2026
Riley Barth
R
B
Engine Another no start after washing engine bay
  • bruno
  • Apr 26, 2026
  • Fox 5.0 Mustang Tech
  • 2
Replies
24
Views
681
Fox 5.0 Mustang Tech May 7, 2026
AeroCoupe
Electrical 88 EEC Injectors batch firing ?
  • Dustin 86GT
  • Dec 8, 2025
  • Fox 5.0 Mustang Tech
Replies
10
Views
429
Fox 5.0 Mustang Tech Jan 8, 2026
gkomo
A
Check Engine codes jumping around
  • azactor
  • Jan 9, 2026
  • 1996 - 2004 SN95 Mustang -General/Talk-
Replies
1
Views
184
1996 - 2004 SN95 Mustang -General/Talk- Jan 10, 2026
gkomo
P
Repeated P2004 DTC trouble code with no apparent symptoms
  • poehitman
  • Mar 11, 2026
  • SN95 V6 Mustang Tech
Replies
2
Views
184
SN95 V6 Mustang Tech Mar 12, 2026
poehitman
P
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?