I work at the Honda dealership in Flordia and I just rebuilt this 1.6L Ex motor. New rings new seals everything you can think of. Honed etc. I also rebuilt this 91 CRX SI trans. to. It shifts so tight and feels so good.

My problem is I installed the motor and Iam using a crx si ecu. OBD 1 injectors. I bypassed the resistor box by giving the injectors a 12v source constenly. Kinda like what you see on the newer motors that don't use a resistor box. Using the Dead plug. Anyways, I doesn't idle right. It runs extremly rich! Its like its getting to much fuel and or air. Way to much. I have tried switching over to a crx si intake manifold still runs the same. Doesn't idle right. I checked the IACV nothing wrong there.

I need help badly. I have been trying to fix this in my spare time at work. Iam soo stumped on what to do or how this swap goes into this car. I don't care to switch to OBD 1 so please don't suggest that.

Iam using my obd 0 HF distributor. 91 crx si ecu. And my engine harness. I would also like a picture of anyone motor swap that has done this before so I can see how you routed some vaccum lines and see where they go to. The civic ex has a evap sensor on the fuel rail then that leads to the canister. Using the crx si intake manifold it doesn't have that. I just need some advise what to do to get this to run right without switching to obd1. I know this can't be this much of a pain in the ***.

I drove the crx with the motor in it. THe motor runs so freaking strong. The trans. shifts soo tight and good. Its very impressive and feels good. It just stalls out so fast because its like its getting way to much fuel or air.

 

The problem is you wired the injectors for obd1 but your ecu is NOT obd 1. You should have left your wiring stock if u wanted to run the si ecu. You need to get an obd1 ecu now. You also need a distributor adapter harness or repin it and get an obd1 distributor. http://Www.Rywire.com sells the adapter harness for obd0 to obd1 for 35 bucks shipped.

 

well thats simple then. I already did this. I switched the wiring back the way it suppose to go. I wired my power to the resistor and the injectors to the resistor.

And I don't see how it makes a differnce because i still got 12v coming out of the resistor box. Shouldn't it be like 6v or half?

 

Here's your problem:
You don't want to switch to obd1? Then wire your injectors back to stock. If your staying obd0 then they need a resistor box.
Another problem for you will be activating vtec. You need an sir civic or crx obd0 ecu but I don't think vtec will work without a vtec distributor. The only obd0 dizzy I can think of is for a bseries.

 

Sorry I wrote that second one too quick

 

Well I think then the right way will be to switch to OBD 1 then correct?

If I want to use vtec right, won't I have to have vtec run from the ecu to activate? Cause it looks like the MSD activator just turns on the solnoid when it reaches the desired rpm? But how does the ecu know when to give it fuel for that extra power?

Would it be better to run OBD 1?

 

The ecu won't change anything when yur using the switch. Just convert to obd1, buy a 92-95 ex or si distributor, same year ecu, run your wires for obd1 and go.
The switch activates vtec but like u said there's nothing added to go with that extra air so yur car will just lean out. You don't want that.