Originally Posted by Storm88000 
When you said you unplugged an ECU relay, are you referring to the greenish one? Kind of hanging there off the ECU?
If you disconnect that, the motor will not start or will stall when it runs out of fuel in the lines because the fuel pump will be off. However, you can open the fuel pump relay in the engine bay and bridge a wire from the #4 pin to the positive battery terminal and the fuel pump will prime even with the keys completely out of the ignition, and with the key the car will start up normally and drive normally. However, when you shut the motor off and remove the key, the fuel pump will continue to prime and will not stop.
My point here is that it sounds like you have some sort of wiring or relay problem where something is remaining on that normally only functions when you turn the key to the accessories setting. Something that would draw just enough power out to kill a brand new battery in about 3 days or less. A fuel pump priming non-stop would kill a brand new battery in about 3 days or less. So when you said you heard the "ticking" sound from the ECU but it stopped when you removed the relay it made me think of it. Although now that I think of it, if your fuel pump primed for 3 days straight it could/should burn out, but on the other hand, if the battery is dead, it can't prime at all. Now I just confused myself.
haha, oh man. the more i continued reading, the more i think my brain started to smoke!
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