Most likely you will need to swap back to the stock motor.. just go over there, pay $30 for the inspection and let them tell u what u need to do.. with every paid test u get a free retest
I don't think there is an evap on the D15B VTEC.....I know there isnt one on JDM OBD1 D and B series motors. You will need to add one to the IM. PCV valve, O2 sensor, Cat and a CARB legal header or switch to a OEM exhaust manifold.
You can get an evap system and tap a fitting into your JDM IM (stock location is back of IM on driver's side). But you're right about a USDM D16Z6 complete IM will work well (scavenge a wrecked 93-95 Civic EX coupe, 92-95 Civic HB Si or EX Sedan)
If you use the JDM IM, There is a tab for you to also tap a hole to mount the sensor to the IM. Then a hose ran from sensor to the tap inside the plenum on the IM. Then a line from sensor to charcoal canister. Also a bigger line comes off charcoal canister to a line on the TB. That should be all of it.
Any OEM exhaust manifold that fits the head will work for the ref. Just no aftermarket header without a CARB number.
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