So I just swapped in a 99-00 b20b into my 93 civic ex coupe I switched over to obd1 components to keep it plug and play. Went to the junk yard and took off an intake manifold from an integra not realizing that it was an obd2 im so I have one extra hose from the charcoal canister that doesn't have anywhere to connect it to can someone tell me what i can do about this ? I will post a pic up later for better reference

 

This is the IM i am talking about

 

And this is the hose i am talking about the one that goes to the throttle body only thing is that the obd2 IM doesn't have that plug in the throttle body

 

The one on the top of the throttle body is just constant vacuum from the manifold. So you can tee the larger hose from the canister into any of the other lines that connect to the main part of the manifold.

The solenoid on the top of the OBDII manifold is the canister purge for OBDII systems (one big hose to the canister). If it is normally open, which I think it is, you can use it as a source of vacuum by just not connecting the electrical plug.

 

Yeah the plug connected on top of the manifold is not connected and the hose for the plug is connected to the canister so the little skinny hose from the canister can be connected to any of the other hoses ?

 

For OBD1 the little skinny hose is circuit #7 it goes to the purge cut solenoid on the firewall.

You're going to at least need those two solenoids on the firewall to make the system work as OBD1, even though you don't have a full OBD1 manifold.

 

The diagram was just for reference of the canister. I i have full obd2 IM and obd2 throttle body all the hoses are connected minus the skinny hose is that the same thing as what your telling me though would i still need the solenoid ?

 

To make the EVAP system work, you need some sort of a purge cut solenoid. On the OBD1 D16 it was on the back of the intake manifold.

If your diagram is of a B series car, it seems the OBD1 B-series ECU also expects a pressure regulator cut-off solenoid. The 1993 D series does not use one. So you have to remove that from an OBD1 parts car. Would be good to get the whole bracket with the purge cut as well. You don't need the remote MAP since there is one on the OBDII throttle body.

 

Would it be easier to just throw on an obd1 manifold instead ?

 

So i would still need the solenoid though if i go obd1 on the IM

 

What would happen if i leave the hose unconnected ?

 

What if I dont want the evap system to work properly since it doesn't affect performance ?

 

You will still need the pressure regulator cut system for proper performance.

I like EVAP systems, they prevent a lot of pollution with basically no downside.

And yeah if you want plug and play OBD1 you should use a complete set of OBD1 parts including the manifold and the solenoid bracket.

 

What did you mean by normally open ?