Swapped Injectors, Losing Preasure

SonicVQ

The fuel pressure drop you have is normal.
As long as you have 29 psi or more after 30 minutes with the engine off, all is good.

You may want to check the fuel volume. The stock pump is around 120 litres/hour or 1 litre (1.06 quarts) in 30 seconds.

What happens to the crank time, if you turn the ignition on, the fuel pump will run for 2-3 seconds, then switch off, then start the car?

What are your fuel trims?

You could also reset your ECU. Easiest way to to unplug a MAF, start the car, CEL turns on, then turn off the car. Plug it back it, start the car and clear the code.
This will clear/reset the fuel trims. Then start the car and see if it starts quicker.


I have seen fuelling issues that seem to be caused by deleting the cat.
I think from about 2012 the ECU uses the rear o2 sensors to check for a rich/lean bias on the front air/fuel sensors.