Drove home one day and parked. Next day car doesn't start. So far I have replaced the ecu and main relay. Main relay tested bad so I swapped it. Can't figure this out. Any help is appreciated!

 

Car information is required for all tech threads.

 

Check the ground that bolts to the back of the thermostat housing.

 

What lead you to replace the ecu?
Have you checked the car for spark? Can you hear the fuel pump running? Does the car have any alarm system hooked up?

 

Just to clarify I was getting no spark and no fuel. Pump was not priming. I had previously checked the thermostat ground but it seemed ok. Went back and checked it again and found it was rusted to the point where it wouldn't work. Cleaned it up and everything is working fine again. Hopefully this will help people in the future

 

Good info. Glad things are up and working. Cheers.