• Mustang Forums
  • 1996 - 2004 SN95 Mustang -General/Talk-

2002 Gt Idle Issue

  • Thread starter Thread starter Brandon Terry
  • Start date Start date Sep 24, 2017
  • Tags Tags
    4.6 2v idle issues new edge sn95
B

Brandon Terry

New Member
Sep 23, 2017
3
0
0
Sep 24, 2017
#1
  • Sep 24, 2017
  • #1
I have a 2002 GT with full catless exhaust, CAI, Throttle Body, and Tune. When i first fire up my car it has a jumpy idle and has even died on me a couple of times; the wierd part is, is that I can go down the road for half a block and stop and the idle is perfectly fine. It only does it as soon as it is started, but as soon as I drive it, it is perfect. Could it just be the differnt 02 readings from my exhaust and bolt ons? Never noticed it before these mods. I figured the tune would have fixed it but it has kept doing it. Any suggestions on what it could be would be nice.. not a huge problem but I would like to fix it.
P.S. When I turn my car in and immediately flip on the AC it usually will die, it's like any extra use of engine power makes it worse, but it still will be fine after driving it.. not sure if that will help diagnose the problem but thought I would add!
 

wmburns

SN Certified Technician
Aug 14, 2009
5,892
514
204
Houston Texas
Sep 24, 2017
#2
  • Sep 24, 2017
  • #2
The BEST way to answer your questions is with an ODB2 scanner that is capable of reading ODB2 operational PID's.

Here's some information on an affordable Windows based ODB2 scanner. Once you have a high powered ODB2 scanner and see the power it brings to the table you will wonder how any repair could have been done without one. It's a real "game changer".

ForScan ODB2 scanner w ELM327 USB
https://www.stangnet.com/mustang-forums/resources/forscan-odb2-scanner-w-elm327-usb.57/

Here's some more information on how to trouble shoot Idle/IAC issues. This information will help you to understand HOW the PCM uses the various sensors to control the idle. The ODB2 scanner will help to answer the question about what the PCM "thinks" the various sensor readings are.

Troubleshoot IAC idle problems 1996-2004
https://www.stangnet.com/mustang-forums/resources/troubleshoot-iac-idle-problems-1996-2004.13/
 
You must log in or register to reply here.

Similar threads

M
01 mustang 3.8 fuel pressure issue
  • Mhaley2006
  • May 29, 2026
  • 1996 - 2004 SN95 Mustang -General/Talk-
Replies
0
Views
71
1996 - 2004 SN95 Mustang -General/Talk- May 29, 2026
Mhaley2006
M
What's it Worth? 2000 GT
  • Mustang5L5
  • May 8, 2026
  • What is it Worth?!?!?
Replies
6
Views
240
What is it Worth?!?!? Jun 13, 2026
KRUISR
SURGING IDLE / NO IDLE CHECKLIST FOR 1996–1998 MUSTANG GT (4.6L 2V) - Work In Progress
  • Noobz347
  • Aug 30, 2025
  • 1996 - 2004 SN95 Mustang -General/Talk-
Replies
0
Views
681
1996 - 2004 SN95 Mustang -General/Talk- Aug 30, 2025
Noobz347
Engine 1986 GT Overheating issues
  • 86 5O GT
  • Jan 25, 2026
  • Fox 5.0 Mustang Tech
Replies
18
Views
478
Fox 5.0 Mustang Tech Jan 29, 2026
86 5O GT
SURGING IDLE / NO IDLE CHECKLIST FOR 1999–2004 MUSTANG GT (4.6L 2V) - Work In Progress
  • Noobz347
  • Aug 30, 2025
  • 1996 - 2004 SN95 Mustang -General/Talk-
Replies
0
Views
815
1996 - 2004 SN95 Mustang -General/Talk- Aug 30, 2025
Noobz347
Share:
Bluesky Email Share Link
  • Mustang Forums
  • 1996 - 2004 SN95 Mustang -General/Talk-
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?