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

MAF Question need your expert advice!

  • Thread starter Thread starter Slo5Oh89
  • Start date Start date Jan 30, 2012

Slo5Oh89

Member
Oct 8, 2009
226
3
19
Washington, IL
Jan 30, 2012
#1
  • Jan 30, 2012
  • #1
Guys I got a MAF for free I was told its a 75MM Cobra MAF. I have a '89 semi stock 5 speed with 19 pound injectors. I will say it made a noticable difference. IF this sensor is the wrong one can I swap out the stock sensor and put it in this bigger housing? Help or ideas?

Numbers on sensor?
F4SF-12B579-AA
AFH70-02A
 

Blown88GT

Founding Member
Nov 13, 1999
2,283
524
164
Palm Beach Gardens, FL
Jan 30, 2012
#2
  • Jan 30, 2012
  • #2
Sensor is OK, but meter is not, unless it's calibrated for 19lb injectors
What is make of meter? I think Cobras were 70mm.
F4SF = 1994 T-Bird
 

Slo5Oh89

Member
Oct 8, 2009
226
3
19
Washington, IL
Jan 30, 2012
#3
  • Jan 30, 2012
  • #3
It is a ford branded MAF. So do I have to get a different MAF? And if so what are the sugguestions? I do have a MAC CIA but am maything thinking about a Anderson power pipe
 

txstang84

15 Year Member
May 21, 2005
1,639
42
69
Tuscola, tx
Jan 30, 2012
#4
  • Jan 30, 2012
  • #4
Does it work well? If yes, leave it there lol

Fwiw, I *think* the 94-95 'bird and Mustang 5.0s shared the same MAF part numbers...might wanna do some looking though. And blown88gt is right, 5.0 Cobras were 70mm...
 

Mustang5L5

That is…until I whipped out my Bissell
Mod Dude
Feb 18, 2001
43,183
17,886
224
Massachusetts
Jan 31, 2012
#5
  • Jan 31, 2012
  • #5
That's a 4.6L T-bird MAF and not really compatible with the Fox 5.0.

It may work and get the car driving, but unless you put the car ona dyno with a wideband and see the A/F ratio, you don't really know what it's doing.
 

Slo5Oh89

Member
Oct 8, 2009
226
3
19
Washington, IL
Jan 31, 2012
#6
  • Jan 31, 2012
  • #6
Is it possible to put the stock sensor in that bigger housing?
 

f8tlfiveo

My wife likes my spool and blow-off valve.
Aug 8, 2007
1,585
102
64
Lancaster, PA
Jan 31, 2012
#7
  • Jan 31, 2012
  • #7
Yes it is possible, but you would need a tuning device to be able to change the mass air transfer to match the meter. You could put your sensor in a 3.5 inch tube if you want. You would just need to be able to change your transfer to match. I have a slot sensor from a 2005 up mustang that I am using in a 3.5 inch tube. But I have a quarterhorse tuning device, so I can make the changes for this to work. It will most likely not work without a quarterhorse or tweecer.
 

Mustang5L5

That is…until I whipped out my Bissell
Mod Dude
Feb 18, 2001
43,183
17,886
224
Massachusetts
Jan 31, 2012
#8
  • Jan 31, 2012
  • #8
Long story short....that meter is not ideal for you
 

Slo5Oh89

Member
Oct 8, 2009
226
3
19
Washington, IL
Jan 31, 2012
#9
  • Jan 31, 2012
  • #9
10-4!
 

jrichker

StangNet's favorite TOOL
In Remembrance. Thank you for your contributions
Mar 10, 2000
27,512
2,811
234
Dublin GA
Jan 31, 2012
#10
  • Jan 31, 2012
  • #10
The MAF body and sensor are designed to match each other. Therefore you can't swap sensors between different part number MAF bodies and maintain proper calibration. The assembly is designed to match the computer’s internal program, and swapping a different MAF can upset the computer's calibration. In other words, your monster MAF probably won't match the calibration of your 5.0 Mustang computer.

The only other MAF that is a one for one swap for a 93 and earlier 5.0 Mustang is the 94-95 Mustang MAF.

94-95 Mustang GT MAF - $40-$100. It is 70 MM instead of the stock 55 MM on regular stangs built prior to 94. It uses a slip on duct on the side that goes to the throttle body and a 4 bolt flange on the other. You need a flange adapter to fit the stock slip on air ducting that goes to the air box. Wiring plugs right in with no changes. *1 *2

Once your replacement 70MM MAF is in place, disconnect the battery for about 10 minutes. When you reconnect the battery and start the engine, the computer will relearn the settings for the new MAF.

*1.) Metal flange adapter http://www.kustomz.com/cat3.html Buy the TR70 for $44.95. Or spend some time on eBay looking for one that may fit.

*2.) MAF & sensor interchange
The 94-95 Mustang 5.0 MAF & sensor is also found on:
1995-94 Mustang 3.8L F2VF-12B579-A2A,
1994-92 Crown Victoria 4.6L F2VF-12B579-A2A,
1995-94 Mustang, Mustang Cobra 5.0L F2VF-12B579-A2A,
1994-92 Town Car 4.6L F2VF-12B579-A2A,
1994-92 Grand Marquis 4.6L F2VF-12B579-A2A,
Evidently the –A1A, -A2A, AA, etc. on the end of the part number is a minor variant that did not change the operating specs. You should be able to ignore it and have everything work good.
 
You must log in or register to reply here.

Similar threads

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
683
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
816
1996 - 2004 SN95 Mustang -General/Talk- Aug 30, 2025
Noobz347
Progress Thread Giving an abandoned 88 GT project a new chance at life
  • jaketractor
  • Jan 9, 2025
  • Fox 5.0 Mustang Tech
  • 2
Replies
27
Views
2K
Fox 5.0 Mustang Tech Jul 20, 2025
Noobz347
A
95 Gt intermittent backfire
  • A_A_Ron
  • May 26, 2025
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
Replies
0
Views
398
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- May 26, 2025
A_A_Ron
A
MAF Voltage Readings.
  • PonyGTrider
  • Oct 15, 2023
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • 2
Replies
34
Views
4K
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- Jun 4, 2024
limp
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?