• Mustang Forums
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • 1994 - 1995 Specific Tech

1994 Mustang Gt erratic idle

  • Thread starter Thread starter Dack1
  • Start date Start date May 21, 2020
D

Dack1

Member
May 1, 2020
3
1
13
Iowa
May 21, 2020
#1
  • May 21, 2020
  • #1
Okay everyone, I'm looking for some help. I have a 94 mustang gt with a 302. It was a manual car and we swapped it to a c4. It has Windsor Jr heads, e303 cam, trick flow intake, K & N CAI, 70mm bbk throttle body, and 24 pound injuctors. I have a couple issues that are stumping us and we're looking for some help. 1. We have an idle issue, it likes to start and die, it acts like it is constantly searching for a signal. 2. It has a ton of blow by, i actually took it to the track for the first time and it literally blew the oil dipstick right out of the tube and blew oil all over. And 3. It likes to get really warm really fast, it can idle for 10 minutes or so and be close to 190+. Any insight would be greatly appreciated. Thank you.
 

96pushrod

I think they're a little easier to get off
5 Year Member
May 15, 2018
1,530
871
133
Savannah
May 22, 2020
#2
  • May 22, 2020
  • #2
Well the car getting up to temp quickly is by design. The electric fan doesn’t cut on till the car gets up to temp, so if it levels off at 190* then it’s doin it’s job.

You have to either get the car tuned, or buy a quarterhorse setup and learn the system. I’d recommend having a reputable shop do it, then maybe you can learn some along the way.

Bottom line is the car isn’t going to be very happy with the changes you’ve made without compensating for it in the computer.

For the blow by: is there a pcv? Is it clogged? Lots of blow by can be indicative of ring seal issues. I’d buy a vacuum gauge at the Parts house and see what the gauge is doing. They are great diagnostic tools.
 
Reactions: revhead347
You must log in or register to reply here.

Similar threads

Y
Engine 1994 Ford Mustang Gt Rod Knock/Stuck Lifter
  • yaboity
  • Jun 7, 2025
  • 1994 - 1995 Specific Tech
Replies
2
Views
275
1994 - 1995 Specific Tech Jun 8, 2025
AeroCoupe
B
High 2k idle(1988 Mustang GT 5.0 non maf)
  • BurtHurts75
  • May 28, 2025
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
Replies
5
Views
302
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- May 29, 2025
BurtHurts75
B
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
733
1996 - 2004 SN95 Mustang -General/Talk- Aug 30, 2025
Noobz347
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
898
1996 - 2004 SN95 Mustang -General/Talk- Aug 30, 2025
Noobz347
K
Engine 2000 Mustang GT - Fuel issue post-blown spark plug repair
  • kenster1092
  • Feb 26, 2026
  • SN95 4.6L Mustang Tech
Replies
4
Views
345
SN95 4.6L Mustang Tech Mar 10, 2026
kenster1092
K
Share:
Bluesky Email Share Link
  • Mustang Forums
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • 1994 - 1995 Specific 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?