First I want to thank jrichker for his in depth post about the fuel system and electrical diagnosis which has got me almost to beat this issue.
http://www.stangnet.com/mustang-for...uously-with-key-on-but-car-wont-start.754221/
Now to what I have. My dad owns a 1993 cobra and bought it brand new in 93. He has an issue where the fuel pump stopped working. I read the above post and tested all the above. relay is good, inertia switch is good, and fues links are good. My problem is that when I turn the key to run, the fuel pump does not turn on and the relay does not click. I hook up a jumper from the ecc test connector pin to ground and the relay clicks and the pump turns on and does not turn off, just keeps running. Even if i remove the jumper wire from ground, it just continues to run. So I test this section of jrichkers post ("The light blue/orange wire provides a ground path for the relay power. With the test connector jumpered according to the previous instructions, there should be less than .75 volts.") When I do this, I get around 8 volts instead of .75 volts. Which tells me that maybe I have two wires that have maybe been ate up by mice and got crossed with each other. So I cut the light blue/orange wire, solder on a long wire that I run right to a chassis ground. Now I turn the key to run and the fuel pump turns right on but does not shut off. So im then led to believe that maybe no wires are crossed but instead the ecc computer has gone bad.
I get the part number off the computer and it is the X3Z computer. I look around and they are about 400 bucks for a new one. But I can find used ones on ebay that are the A9L and A9P. And they are a dime a dozen. Im curious if I can change out the x3z computer with one of the others and even if I have a slight drop in car performance, that is fine, dad just putts around in it anyhow and doesnt have hardly any money to throw at it (kind of why im the one trying to fix it) Any help or suggestions would be awesome and Thanks again to jrichker and this forum for the awesome help so far..
http://www.stangnet.com/mustang-for...uously-with-key-on-but-car-wont-start.754221/
Now to what I have. My dad owns a 1993 cobra and bought it brand new in 93. He has an issue where the fuel pump stopped working. I read the above post and tested all the above. relay is good, inertia switch is good, and fues links are good. My problem is that when I turn the key to run, the fuel pump does not turn on and the relay does not click. I hook up a jumper from the ecc test connector pin to ground and the relay clicks and the pump turns on and does not turn off, just keeps running. Even if i remove the jumper wire from ground, it just continues to run. So I test this section of jrichkers post ("The light blue/orange wire provides a ground path for the relay power. With the test connector jumpered according to the previous instructions, there should be less than .75 volts.") When I do this, I get around 8 volts instead of .75 volts. Which tells me that maybe I have two wires that have maybe been ate up by mice and got crossed with each other. So I cut the light blue/orange wire, solder on a long wire that I run right to a chassis ground. Now I turn the key to run and the fuel pump turns right on but does not shut off. So im then led to believe that maybe no wires are crossed but instead the ecc computer has gone bad.
I get the part number off the computer and it is the X3Z computer. I look around and they are about 400 bucks for a new one. But I can find used ones on ebay that are the A9L and A9P. And they are a dime a dozen. Im curious if I can change out the x3z computer with one of the others and even if I have a slight drop in car performance, that is fine, dad just putts around in it anyhow and doesnt have hardly any money to throw at it (kind of why im the one trying to fix it) Any help or suggestions would be awesome and Thanks again to jrichker and this forum for the awesome help so far..