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

1989 Fox Runs Rough When Cold And Code ?s

  • Thread starter Thread starter tjmi69
  • Start date Start date Apr 1, 2015
Prev
  • 1
  • 2
First Prev 2 of 2

tjmi69

New Member
Apr 1, 2015
29
0
1
lansing,mi
Apr 8, 2015
#21
  • Apr 8, 2015
  • #21
Alright I went to check the timing and my car won't stay running with the spout removed? Any ideas
 

liljoe07

5 Year Member
Feb 18, 2009
1,622
363
124
Cartersville,Ga
Apr 8, 2015
#22
  • Apr 8, 2015
  • #22
Timing is too retarded if it wont stay running with no Spout. Advance the timing enough so it stays running.
 

tjmi69

New Member
Apr 1, 2015
29
0
1
lansing,mi
Apr 8, 2015
#23
  • Apr 8, 2015
  • #23
Alright cool. I'll try that tonight. Thanks
 

tjmi69

New Member
Apr 1, 2015
29
0
1
lansing,mi
Apr 9, 2015
#24
  • Apr 9, 2015
  • #24
Alright guys. I set my timing tonight to about 14 degrees when I took it down to 10 it wouldn't even stay running. When I plugged the spout back in it jumped to about 22 degrees. Is this normal?
 

liljoe07

5 Year Member
Feb 18, 2009
1,622
363
124
Cartersville,Ga
Apr 9, 2015
#25
  • Apr 9, 2015
  • #25
Yes, that is normal for the timing to advance when the spout is plugged in.
 

tjmi69

New Member
Apr 1, 2015
29
0
1
lansing,mi
Apr 9, 2015
#26
  • Apr 9, 2015
  • #26
I knew it was normal to advance I just wasn't sure if it was normal to advance that much. What about it not staying running at 10 degrees?
 

Mustang5L5

That is…until I whipped out my Bissell
Mod Dude
Feb 18, 2001
43,324
18,049
224
Massachusetts
Apr 9, 2015
#27
  • Apr 9, 2015
  • #27
First thing i'd so is take care of the code 12 and 13, but doing the idle reset procedure.

Pull the IAC plug with engine running and adjust idle stop screw to a low idle. If the engine won't run with the IAC unplugged, open the screw up a lot, start the engine, and then back it down.

Then shut off the engine, plug the IAC back in and reset the computer by unhooking the battery for 30 mins. Then hook it up and restart. Drive around a bit and let it relearn idle.

Then rerun the codes
 

liljoe07

5 Year Member
Feb 18, 2009
1,622
363
124
Cartersville,Ga
Apr 9, 2015
#28
  • Apr 9, 2015
  • #28
tjmi69 said:
I knew it was normal to advance I just wasn't sure if it was normal to advance that much. What about it not staying running at 10 degrees?
Click to expand...

You would need to check that the balancer hasn't spun. You just need to see where 0 on the balancer is in relation to the pointer, when #1 piston is at top dead center.
 

tjmi69

New Member
Apr 1, 2015
29
0
1
lansing,mi
Apr 9, 2015
#29
  • Apr 9, 2015
  • #29
Alright thanks guys.will try all this tonight
 
Prev
  • 1
  • 2
First Prev 2 of 2
You must log in or register to reply here.

Similar threads

2
Running very very rich
  • 2esoteric
  • Oct 31, 2025
  • Fox 5.0 Mustang Tech
Replies
4
Views
419
Fox 5.0 Mustang Tech Oct 31, 2025
Noobz347
S
Fuel ‘88 GT Runs Rich Cold — Fixes Itself When I Unplug Sensors (ECT, MAF, O2, etc.)
  • Sufarry
  • Nov 6, 2025
  • Fox 5.0 Mustang Tech
Replies
12
Views
991
Fox 5.0 Mustang Tech Nov 9, 2025
Mustang5L5
8
Engine Rough idle and aggressive sputtering when accelerating
  • 88vertible
  • Aug 13, 2025
  • Fox 5.0 Mustang Tech
Replies
4
Views
1K
Fox 5.0 Mustang Tech Dec 13, 2025
Jarhead67
J
Engine Ran my code reader and
  • Mindseye007
  • Aug 10, 2024
  • Fox 5.0 Mustang Tech
Replies
3
Views
664
Fox 5.0 Mustang Tech Aug 19, 2024
Mindseye007
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
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?