Re: Help! Mustang wont start!
 

I will change it out (fuel pump relay)....But would this keep the engine from starting?

Thanks

Re: Help! Mustang wont start!
 

Hi just went through same problem it was computer could'nt pull any codes,all the electronics and wiring were getting 12 volts but eec wasn't sending out the the negative for all the components,talk about pain in the ass. Good to see you got it fixed,eec remanufactured was 140.00 canadian.

Re: Help! Mustang wont start!
 

it sounds like the injectors might be clogged, you said that you have pressure to the rails and you definitly have spark right? And when you sprayed starting fluid in the motor it fired and the stopped, it could be that the injectors have some debris in them, and its preventing enough fuel to get into the cylinder.

Re: Help! Mustang wont start!
 

You could also try replacing the coolant temperature sensor that tells the computer if the engine is cold or warm. The sensor is located on the passenger side of the intake by the thermostat. Last summer I had mine disconnected when I took out the coolant hardline and the car ran fine and then didn't start. Had to actually start the car like it was flooded and carburated by holding the pedal to the floor. Just a suggestion, hope you get the problem fixed.