need help with mass air conversion on 86 gt!

here is a site for the information: http://www.stangnet.com/tech/maf/massairconversion.html

take a look here http://forums.stangnet.com/showthread.php?t=726765&highlight=maf+conversion

the 4th wire is another ground wire. Why are you swaping the entire harness instead of just adding in the mass air changes?

There is another post about this 4th wire. The answer I saw was that the single ground on the O2 sensors gets flakey thus causing mixture issues. I thought it said in 94 they added a second ground wire. My 93 has 3 wires but you said this was out of a 88 so maybe it was hit and miss on each vehicle.

It should be running better. Did you make the necessary changes to the MAP sensor etc.? The A9L computer should work fine, but if you are going to the trouble of convertin to mass air, you might as well run a quality aftermarket MAF rather than the stock POS MAF units.

The VSS and fuel pump monitor will not cause your poor performance problems. There was no VSS on cars made before 87 unless they had cruse control.

To find the source of your current poor running problems, dump the codes and see what the computer says is wrong…Codes may be present in the computer even if the Check Engine light isn’t on.

Here's the link to dump the computer codes with only a jumper wire or paper clip and the check engine light, or test light or voltmeter. I’ve used it for years, and it works great. You watch the flashing test lamp or Check Engine Light and count the flashes.

See http://www.troublecodes.net/Ford/





If your car is an 86-88 stang, you'll have to use the test lamp or voltmeter method. There is no functional check engine light on the 86-88's except possibly the Cali Mass Air cars.



89 through 95 cars have a working Check Engine light. Watch it instead of using a test lamp.



Codes have different answers if the engine is running from the answers that it has when the engine isn't running. It helps a lot to know if you had the engine running when you ran the test.

Trouble codes are either 2 digit or 3 digit, there are no cars that use both 2 digit codes and 3 digit codes.

For those who are intimidated by all the wires & connections, see http://www.actron.com/product_detail.php?pid=16153 for what a typical hand scanner looks like. Normal retail price is about $30 or so at AutoZone or Wal-Mart.

Or for a nicer scanner see http://www.midwayautosupply.com/pc-7208-90-equus-digital-ford-code-reader-3145.aspx – It has a 3 digit LCD display so that you don’t have to count flashes or beeps.. Cost is $30.

A9L = '89-'93 Mustang/Manual
X2P = '91-'93 T-Bird/Auto

X2P is a load based strategy EEC with datastream capabilities, or the precursor of the CBAZA setup used for SN95's, it does not use a BP sensor + its pinout is different to the A9x GUFB setups. Make a comparison between both types using the table at http://fordfuelinjection.com/5.0Lpinouts.html .