MAF sensor problem -

Go Back > Ford Mustang Tech > 5.0L (1979-1995) Mustang

5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

MAF sensor problem

Thread Tools Search this Thread
Old 12-14-2013, 03:34 PM   #1
Join Date: Dec 2013
Vehicle: 1993 Ford Mustang LX
Location: TN
Posts: 1
Default MAF sensor problem

Background. I just bought my first Mustang. It is a 93 LX with tons of mods. GT40 heads, 30lbs injectors, V1 Supercharger, Holly lower intake, Cam, bbk 70mm throttle body, and some other stuff. Here is the ad where I bought it.

After sitting for a few hours I have to give it gas for a few minutes to keep it running otherwise the RPM's will drop <700 and it will die. I took it into the shop and the mechanic replaced the Idle Air Control valve with a stock one. This didn't fix the problem and I think it may be the Mass Airflow Sensor. It has a stock sensor but is running 30lb injectors and a V1 Supercharger. I called the mechanic and he told me it would need a different IAC because of the charger but that sounds like BS to me. He was recommended by my dad but I am not impressed. Anyway, I can see the sensor and it would be easy to replace I just need to know which MAF sensor I need to get. And also will I need a different IAC valve because of the SC?

I performed the koeo test. It gave me codes 31, 81, and 82. It froze here for about 5 minutes and never put out the separator code or the cmm codes. In addition when I performed the koer test it did nothing until the tester eventually turned off. I looked for the EGR and it has been removed but I guess not deleted from the computer so I'm getting the code. Any way what should I do here?
Dirgruntled3lf is offline   Reply With Quote
Old 12-14-2013, 07:10 PM   #2
6th Gear Member
mattdel's Avatar
Join Date: Nov 2006
Vehicle: 1986 LX, 87 GT Hatch, 89 GT Vert
Location: Spfld, MA
Posts: 9,240
Send a message via AIM to mattdel

Some people purchase an IAC adjuster plate that allows fine tuning of idle with forced induction applications, but your problem is the MAF. You need one calibrated for 30# injectors.
mattdel is offline   Reply With Quote
Old 12-14-2013, 07:17 PM   #3
5th Gear Member
Join Date: Jul 2012
Vehicle: 1990 lx hatch 5.0
Location: ohio
Posts: 3,199

I agree with mattdel

either get a maf that is calibrated for 30lb injectors or at least get a maf housing that has a 30lb sample tube.

I run 30s with stock maf, but I have a C&L maf housing with a calibrated sample tube.
dawson1112 is offline   Reply With Quote
Old 12-14-2013, 09:22 PM   #4
2nd Gear Member
Join Date: Sep 2011
Vehicle: 89 Mustang
Location: Ohio
Posts: 325

I agree you need a larger MAF, but you also need a dyno tune with chip for the supercharger. Find someone in your area that has tuned Fox Mustangs with superchargers before.
89 Coupe, 369 big bore, AFR, custom Comp cam, Kooks, 3" exhaust, 11.6 @ 121 mph
04 Cobra, JLT 12" CAI, Magnaflow, Borla, Stifflers, FTBR Rr Susp, MM Frt Susp, 12.4 @ 115 mph
67 Cougar, XR7 GT, 462 FE, 4 spd, Edelbrock heads, PI intake, Global West
reldla1996 is offline   Reply With Quote


Similar Threads
Thread Thread Starter Forum Replies Last Post
Code troubleshooting Jb145700 4.6L V8 Technical Discussions 8 09-24-2015 05:08 PM
OBD: The Adventure Begins (PO402 and PO401), DPFE/EGR test procedures TfcCDR V6 (1994-2004) Mustangs 1 09-14-2015 01:08 PM
Time for a new clutch? MasterLanMan 4.6L (1996-2004 Modular) Mustang 6 09-13-2015 09:21 PM
2005 GT Intermittent Low Rail Pressure Throttle Drop zanemoseley 2005-2014 Mustangs 6 09-06-2015 01:58 PM
Speedometer issue after tuning articman General Tech 0 09-04-2015 05:42 AM

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump


All times are GMT -5. The time now is 07:16 AM.

This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. FordŽ is a registered trademark of the Ford Motor Company