I tried to start up my car this morning and it would turn over but wouldn't fire up. I had similar trouble that turned out to be a dead battery a few weeks back and thought that might be the problem again, so instead of jumping the car or trying to charge the battery again I bought a new battery... didn't change a thing. I haven't been able to check the fuel injectors or ignition system yet, but I just installed new injectors about a week ago and my spark plugs and wires are only a few months old. Also, I have normal fuel pressure when trying to start the car, and just checked for vacuum leaks a few days ago (and fixed one). Where else should I check? Thanks in advance!

 

I'd try the DME relay.

 

Or cracked wires at the reference sensor.

 

Thanks for responding guys. Looks like it was the battery. After waiting a few hours the car started right up with the new battery... must have been flooded after I first changed the battery.

 

Save your old battery, it's probably fine. If your engine turns over, the battery is definitely not the problem.