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]

The only injectors that are different on 6GC would be the California vs Federal emissions injectors. IIRC, the Cali injectors have light green plastic, and Fed ones are dark green. Cali injectors have more business going on on the tip, as there's extra holes on the sides for vacuum assist. The Cali head also has the extra port b/w injectors 2 and 3 for the said vac assist. If you did not hook this up, you'd have a sizeable vacuum leak which could very well be causing at least some of your problems.
Other than that, look for vac leaks in general, and/or malfunctioning IACV. Did you use your original IACV, or the new one? If the new one is acting up, it may be defective - try the original one.

[That_Black_Celic...]

The only injectors that are different on 6GC would be the California vs Federal emissions injectors. IIRC, the Cali injectors have light green plastic, and Fed ones are dark green. Cali injectors have more business going on on the tip, as there's extra holes on the sides for vacuum assist. The Cali head also has the extra port b/w injectors 2 and 3 for the said vac assist. If you did not hook this up, you'd have a sizeable vacuum leak which could very well be causing at least some of your problems.
Other than that, look for vac leaks in general, and/or malfunctioning IACV. Did you use your original IACV, or the new one? If the new one is acting up, it may be defective - try the original one.

the 2 sets of 96 injectors i own are lime green with a more narrow nozzle, the set of 94's i have right now are darker green adn have a flat rubber tip
could this really be my issue?

[That_Black_Celic...]

The only injectors that are different on 6GC would be the California vs Federal emissions injectors. IIRC, the Cali injectors have light green plastic, and Fed ones are dark green. Cali injectors have more business going on on the tip, as there's extra holes on the sides for vacuum assist. The Cali head also has the extra port b/w injectors 2 and 3 for the said vac assist. If you did not hook this up, you'd have a sizeable vacuum leak which could very well be causing at least some of your problems.
Other than that, look for vac leaks in general, and/or malfunctioning IACV. Did you use your original IACV, or the new one? If the new one is acting up, it may be defective - try the original one.

on a second note i am unaware of what IACV is.

and one more thing, im using the 94 EGR valve which has a 2 prong plug coming from it, does this mean its electronically controlled or does it have a sensor? cause this could be my problem as the 96's egr did not have a plug

[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.

[That_Black_Celic...]

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.

i need a federal 96/97 ecu so i can run the 94 injectors properly?

[That_Black_Celic...]

alright i solved the issue,
there was no vacuum hose leak but i managed to install the Cali injectors into the federal injectors port

all i did was take 2 sets of the thick round gasket at the end of the federal injectors and stacked em on top of each other on the Cali injector
with one of the rubber rings that would be on the tip of the Cali injector in between.

its a tight fit but if you put the injector into the fuel rail first then squish it down while rotating a little left to right they slide right in, the bolts wont seat the full way so tighten it down good with a tiny itty bitty amount of thread locker on the end of it cause mine just came loose on the first test drive.

that fixed it, so with anybody else out there with a similar issue here you go

[slavie]

You need 96-97 ECU because your car is 96 and you have 96+ distributor with external coil, harness, OBD2 port, and emission crap. 94-99 Fed injectors are same. If you want to convert all that crap to 94 to run 94 ECU, more power to you.

This post has been edited by slavie: Nov 8, 2020 - 8:48 PM