I HAVE A 86 LX 5.0 HO. NEED TO KNOW HOW TO GO FROM SPEED DENSITY SETUP TO MAF. I'M GOING TO BUY USED MAF SENSOR,TUBING,COMPUTER,AND AIR FILTER. WANT TO KNOW IF I CAN ONLY PUT IN A FEW WIRES FROM A FACTORY MAF WIRE HARNESS TO KEEP IT SIMPLE.ANY HELP IS APPRECIATED.THANKS.
jegs sells a kit to do the swap for like $70. I got mine from a local mustang shop for 40. Your going to have to splice in to some wires and add some pin to you harness. Its pretty simple job. Some body im sure has the diagrams they will post for you.
i converted my 88 very easy, go to isp web site order just the harnes which is only like $45, bought a 89computer and hooked it up in like an hour.. easy..
i bought used parts and a conversion harness. you can do it without the conversion harness if you got the pigtail harness from the maf donor car. its been years since i did it, but it was cake. do a tech search on here and corral.net, the online how-to is on one of these sites. i think its just adding a pin or two to the harness and moving one or two wires in the harness, then swapping computers and youre done.
MASS air conversion instructions from http://www.stangnet.com/tech/maf/massairconversion.html FREE
A9L (5 Speed) computer from junkyard $100-$150
A9P (Auto or in a pinch, 5 Speed) computer from junkyard $100-$150
70MM MAF from 94-95 Mustang GT - $40-$70
MASS Air wiring harness kit $30-$85
The whole thing is probably less than $300 using junkyard parts.
A9L computers are 5 speed only
A9P computers are automatic, but will work with a 5 speed.
The conversion harness seems to work well for most folks. It avoids the compatibility problems in using a harness from the junkyard. Simple and cheap, actually less work that swapping the wiring harness.
Conversion Harness kits & parts http://www.mass-air.com/ http://fordfuelinjection.com/index.php?p=54
If the idea of moving & soldering wires scares you, here's a list of compatible Mass Air wiring harnesses.
Copied from bbunt302
Just for reference, here's a list of all the compatible years:
89 harness should work for 86-89 as long as you're using mass air.
90 harness will only work in a 90. (B/c of air bags and dual dash connectors)
91 through early 92 harnesses should be compatible (single dash connector, fuel pump relay under driver's seat)
Late 92 through 93 harnesses should be compatible (single dash connector, fuel pump relay under the hood)
Larger MAF to go with Mass Air conversion:
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
*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.