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Old September 13th, 2010, 11:12 AM   #21
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fyi the oil pressure and temp sender plugs are right by each other so you prob just have them on the wrong sensors
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Old September 13th, 2010, 12:16 PM   #22
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Here's one of the sites to check to double check your steps.

Mustang Mass Air Conversion | StangNet
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Old September 13th, 2010, 10:59 PM   #23
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Ok, I took a look at that article on how to convert to mass air...Its not us using a complete harness, only the MA plug...I used a complete harness and new eec...So should I still need to change pins and whatnot??? I wouldnt think I would being that the harness and eec are from the same exact vehicle, but maybe Im wrong...I dont have a clue...


BTW where are these 2 sensors that are right next to each other located???
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Old September 13th, 2010, 11:30 PM   #24
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i have the same problem, i swapped back to speed dense and fired right up, pump and all.
The main problem i may have found: there are 2 plugs on the drivers side, white and brown I believe, that correspond to one female plug on the A9L harness, leaving one unplugged.

so until i can find out how to integrate speed dense wiring into my MA A9L harness, I have to stick to speed dense :{
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Old September 14th, 2010, 02:39 AM   #25
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If the only problems that u are having are the fuel pump and the guages then wire the fuelpump in so it comes on and runs when u want it to and u probly have the temp and oil guage switched since they are both just little slide over the top same sized connections
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Old September 14th, 2010, 10:12 AM   #26
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tried that, would stay running
it'll fire, then immediately shut off
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Old September 15th, 2010, 09:59 PM   #27
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Ok, I picked up the 89 harness w/o airbag plugs today and it came with an eec. I also picked up 19lb injectors cuz whoever had this car before me has 30lb injectors on it with no supporting mods. I will hopefully get around to doing this all tomorrow. Anyone know if I have to delete the MAP sensor vaccum like they do on aftermarket swaps?
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Old September 16th, 2010, 07:12 AM   #28
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Originally Posted by jwstott01 View Post
Ok, I picked up the 89 harness w/o airbag plugs today and it came with an eec. I also picked up 19lb injectors cuz whoever had this car before me has 30lb injectors on it with no supporting mods. I will hopefully get around to doing this all tomorrow. Anyone know if I have to delete the MAP sensor vaccum like they do on aftermarket swaps?
Yes, you have to remove the vacuum line to the MAP sensor or the car will run like shit, if it runs at all.
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Old September 16th, 2010, 09:54 AM   #29
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Fuel pump issue may be that you don't have the correct pin grounded for the fuel pump relay.
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Old September 16th, 2010, 10:56 AM   #30
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Originally Posted by 1slo5.0 View Post
Yes, you have to remove the vacuum line to the MAP sensor or the car will run like shit, if it runs at all.
Whoa... back up a second. Without looking at my car, I didn't think I had a MAP sensor. Or is that a speed density only thing, cuz I thought my old 88 had one on the firewall.
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Old September 16th, 2010, 01:45 PM   #31
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Originally Posted by FastStang91Lx View Post
Whoa... back up a second. Without looking at my car, I didn't think I had a MAP sensor. Or is that a speed density only thing, cuz I thought my old 88 had one on the firewall.
They all have MAP sensors. On mass air cars it is called a Barometric Pressure sensor and has no vacuum line to it. Same sensor, same electronics, different name.
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Old September 16th, 2010, 03:08 PM   #32
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Ok, heres what I did today. I installed my 19lb injectors and a fuel pressure guage. I pulled out the 89 eec harness with airbag plugs. All I have left to do is put the new harness and eec in, connect everything, and put my upper intake back on and I should be good to go. I hope everything turns out okay. Any body know which connectors are for the oil pressure and temp guages so i dont get em backwards again???
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Old September 17th, 2010, 01:04 PM   #33
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Ok so I finished up the car today. I think it has been successful. A buddy of mine told me to adjust the fuel pressure to about 38lbs with the vacuum off. Is that correct for stock injectors??? Other than that and the occasional rough idle I think its done. Guages are reading correctly and no more toggle switch fuel pump. Thanks for the info and help fellas
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