maf/injectors questions

**geps91stang** · 07-27-2012, 05:18 PM

Hi everyone I've got a question about maf and injectors on my 91 gt. It seems my maf sensor has went bad on me and it's been a headache trying to get the right one from the local parts store and I really don't wanna pay all the money ford wants for a new stock one. My question is could i go with a #24 or #30lb injector and matching maf on my current setup which is basically stock with the exception of being bored. 030 over and aftermarket computer comparable cam from comp. I do plan down the road to get a heads and intake combo to match the cam I have now or would I have to have it tuned to run right with this setup. Also if its ok to go this route what else is needed like bigger throttle body ect thanks everyone.

**frankstang** · 07-27-2012, 05:27 PM

There's no need for 24/30# injectors. You'll end up causing yourself bigger headaches than you have now.
Are you sure the meter is bad ? How did you confirm ? I have never seen a stock meter go bad, but I guess it does happen.
Assuming it is the meter, stock Fox 55mm meters are available for a pittance on most Mustang site classifieds. Another option is to use a 70mm meter from a '94-'95 5.0 Mustang as they are curved very similarly.

If you can, borrow a known good stock meter from someone and see what happens. I have a stock '91 meter and an SN94-95 meter laying around, but unfortunately I'm in Pgh. and you're in Connellsville.

**geps91stang** · 07-27-2012, 05:41 PM

I did the test using a multimeter I had 12v from computer to maf I only had 11.94v from the 2 grounds which should be no less then 12v from what I've been told also with car at normal operating temp I have a base idle of. 098v but when I manually move the throttle and watch the multimeter it jumps around and never goes above 3.37 volts i've tested and retested many times with the same results so Idk

**frankstang** · 07-27-2012, 08:01 PM

Here's what I found in a 2 minute search. I'm sure there are plenty more.

http://www.ebay.com/itm/MASS-AIR-FLO...884ad4&vxp=mtr
http://www.ebay.com/itm/MUSTANG-91-S...8e2a3d&vxp=mtr
http://www.ebay.com/itm/1989-1990-19...3d378b&vxp=mtr

**geps91stang** · 07-31-2012, 01:01 PM

Another question what should the fuel pressure be on a stock 5.0 with koeo im getting 30lbs of pressure at the rail with a new regulator and fuel filter.