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I'd like to know, because i want to install a cat that's not legal in california (i live in colorado now), and I'm not really confident enough to try the spark plug trick and I don't want to deal with the CEL being on all the time.
If you put a federal one in it will work but you will need something around 93-96 when the 2nd o2 sensor was not required. Even if the o2 sensor is still there a ECU from then earlier version will not even care about it.
If they do emission testing I dont know if it will work with the OBII since that is where they will get results from for your year. Earlier years they test from the pipe.
From what I head most CA if the do a engine swap or mods that will keep them from passing they will keep the engine or the stock parts around to swap before the test.
I just swapped a 93 7AFEengine, 93 7AFE ECU ECT, and a 5 speed manual in to a 96 Geo Prizm that had a 3 speed and 4AFE. Naturally I have some codes becaues the ECT thinks the shift solenoids are bad from the 4 speed auto (A245E) but that's becaues there is none there. If I lived in a emissions state I would fail. The fact that they might not even be able to get the OBII working might be a fail.
I have the manual version of the 7AFE ECU from the scrap year I got the trans from but on the 3rd port is a 12 pin and not a 24. So only way to make it work is cutting wires around witch I decided I worked on the car to much already and already getting really cold out.
The plan was to get the chassis harness so I can get cruse and some things that I liked on my 93 like auto shut of light when you close the door and NO DLR as well. In order for you to do this you need to tare the dash completely apart, unscrew the wiring, disconnect the wiring, feed it throw the fenders, around the condenser, unhook all the lights,, feed ith threw the other fender, then disconnect some more. The one from the yard was all oily and the fenders and condenser for the AC smashed in making it even more harder to get at. So next summer I will get the one from my old car has everything I want, then I will have to make some custom wiring to get the Manual 7AFE ECU to work.
Sorry for making it so long
If you want to keep what you have, same engine and just want a manual. Just wiring you need to short the park neutral switch (or wire it to the clutch pedal safety switch), and wire up revers lights witch you can do under the hood and dont have to touch the ECU. You can use the same ECU you will get codes for the shit silinoids then they will leave and never come back. Then you just need to shifter and linkages(witch mean you have to run it under the dash), fly wheel, clutch kit, master cylinder, clutch pedal, then make own steel hydraulic lines (its break line just them then from the downer car but keep the rubber hose that should be attached to the trans).
I just wanted all the electrical to mimic or close to mimic factory but for now it just functional.
Engine harness you can keep there will already match the chassis harness since you are keeping the same engine and that how it was factory.