5SFE how to make Cali injectors fit into federal head Options

[That_Black_Celic...]

Greetings all, im having a hard time controlling the idle on my 96 gt

lemme give you the shakedown, i just swapped a 94 engine in but used all the necessary things (crank sensor, distributor etc.) from the 96
its using the 96 fuel rail with the 94 injectors cause the holes for injectors are different this could be the problem

all vacuum hoses are working as they should (rather certain) and i have the upper o2 sensor but not the lower one, thats the only code it throws

The issue im having is at initial start up it takes a moment for it to figure itself out then its sort of erratic , it bogs easy when moving and when i put in the clutch it sky rockets to 2k and sits there unless i pull the pedal back at me. ive played with the cable position countless times and its either to high for idle or too low to keep itself running while starting up or moving

any ideas on the problem? are the 94 injectors smaller and causing issues? do i need to plug in to other O2? cause on my last swap it ran just fine without the O2's being hooked up properly

any help is greatly appreciated thanks!

This post has been edited by That_Black_Celica: Nov 7, 2020 - 6:35 PM

[slavie]

Yep, the lime green with narrow tip is Cali injectors. The dark green are federal.
Besides the potential vacuum leak, the injectors also have a different flow rate:
CA injectors, 23250-74140, 264cc
Fed, 23250-74100, 228cc

Sounds like you had CA spec car and converted it to Fed spec. First, make sure that you've blocked off the injector vacuum assist tube - it should be a hose running from the back-side of the intake hose next to the TB to the back of the head. If you left that hose disconnected, there's a sizable vacuum leak for you.
Next, to make things right, you'll need to get yourself a Fed spec ECU so that it can drive the injectors correctly. You're looking for 96-97 year ECU. 98-99 won't work, neither will 95 and earlier.