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

94 GT Stalls when warm. MAF?

  • Thread starter Thread starter Valicy
  • Start date Start date Nov 22, 2023
V

Valicy

Member
Feb 12, 2020
17
3
13
Washington
Nov 22, 2023
#1
  • Nov 22, 2023
  • #1
Car was running and sat for a few years being started occasionally. Started having a loping idle. Then it would stall when it warmed up a little and wouldn't restart until it was cold again. Pumped out old gas. Replaced the distributor/coil/spark plugs/wires and it runs much better but is still stalling when warm and won't restart. (Thought it was the pickup coil and it just needed a tuneup overall) It will continue to run if I unplug the MAF sensor and it's giving me a 158 code for the MAF Sensor voltage and a 334 for dpfe circuit. I've cleaned the MAF 2 times and it's not any better. Looks like there is a little blob on 1 side of 1 of the resistors on the MAF so I'm thinking it might be bad. It looks like it's receiving voltage and ground fine. Anything I should check before I replace the MAF? I've read somewhere it could be a stuck injector from old fuel also. Thanks for any info.

Edit: Got it to idle with MAF unplugged and timing was a little off so I got that adjusted to 10* BTC. Plugged it back in with it running and it seemed to idle fine but as soon as you give it gas it doesn't want to idle anymore. (Revs up fine) The check engine light isn't currently on but it's not wanting to idle when warm. Sprayed starter fluid around to check for vacuum leaks and didn't really find much. I did clean out the IAC and so maybe that's why it won't idle when warm.
 
Last edited: Nov 22, 2023

General karthief

wonder how much it would cost to ship you a pair
20+ Year Stangneter
Aug 25, 2016
27,913
10,562
203
polk county florida
Nov 22, 2023
#2
  • Nov 22, 2023
  • #2
Go back over it checking for vacuum leaks, pull the upper to get to the hidden ones, check pcv and grommet.
Most idle stall issues are vacuum related.
 
V

Valicy

Member
Feb 12, 2020
17
3
13
Washington
Nov 23, 2023
#3
  • Nov 23, 2023
  • #3
General karthief said:
Go back over it checking for vacuum leaks, pull the upper to get to the hidden ones, check pcv and grommet.
Most idle stall issues are vacuum related.
Click to expand...
Can't find any vacuum leaks but I took the maf sensor out and I'm not getting any resistance from pin A to any of the other pins like every guide says I should have. So I'm gonna pick one up tomorrow and see if that fixes it.

I'm also getting 1.6v between pin c and d at idle. Supposed to be like 0.6v.
 
Last edited: Nov 23, 2023
V

Valicy

Member
Feb 12, 2020
17
3
13
Washington
Nov 26, 2023
#4
  • Nov 26, 2023
  • #4
Update: New MAF sensor fixed the running problem but I still had a surging idle when hot that went from 400-1000rpm. Cleaned throttle body and IAC valve. Helped a little but still surging. Adjusted the idle screw on the throttle body a little bit and now it idles consistently at about 700-750rpm. Didn't have any vacuum leaks that I was able to find.
 
Reactions: Potomus Pete
You must log in or register to reply here.

Similar threads

G
Idle surging after warm up
  • GALLY3309
  • Jun 10, 2026
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
Replies
1
Views
113
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- Jun 10, 2026
Noobz347
T
Help with a 95 5L crank no start
  • TheBubbaJoe
  • Nov 4, 2025
  • 1994 - 1995 Specific Tech
Replies
3
Views
443
1994 - 1995 Specific Tech Nov 5, 2025
AeroCoupe
E
2007 GT Stalls when lights or a/c turned on
  • ejscarfo
  • Jun 22, 2026
  • 2005 - 2009 Specific Tech
Replies
2
Views
128
2005 - 2009 Specific Tech Jun 29, 2026
ejscarfo
E
S
Engine Stalls when downshifting/coasting
  • Scott_S
  • Nov 5, 2025
  • Fox 5.0 Mustang Tech
Replies
11
Views
698
Fox 5.0 Mustang Tech Nov 6, 2025
Mustang5L5
S
Fox '87 GT can't get to stay running
  • spilly
  • Mar 29, 2026
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • 2
Replies
27
Views
779
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- Jun 20, 2026
spilly
S
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?