How do i find out how the vacum lines on my prelude should go

You do not need to connect the three vacume hoses to the EGR just find one that has vacume to it upon accelaration with the car running pull a vacume hose off the carburator with a vacume gage or your finger check to see if you got vacume if not accelarate carb if you do connect vacume line to EGR

check vacum lines for leaks in the headlight assembly,sometimes they dry rot,the vacum lines] it has to a vacum issue. you may need to replace the vacum lines with new vacum hose. you can but it by the foot at any parts store, but you'll need to carry a peice of old one to get exact size.trace the vacum lines from headlights to the source of vacum canister,just to be sure that the canister itself isn't leaking. look for cracks in the vacum lines along the way.if you find that the canister is cracked,it can be repaired by jb weld and repainted,just to keep it original.thank you for choosing fixya.com

It sounds like your heater controls are not working. They are usually operated by a vacume line. check under dash passenger side behind glove box for the vacume line disconected ps check engine side first its easier. if vacume line is good chech vacum at heater box their is a meatel vacume unit that opens and closes the heat and defrost doors. if your heat is only comeing out of the defrosters The doors under the dash are not opening and closeing. ChecK the metal vacume unit . A vacume pump can be purshed at parts store some have a loner program.

IF this is a case that the IWEs will not disengage, it could be the IWE solenoid or the vacuum lines to the IWEs. Could also be a problem with the vent lines from the IWE ( the other vacuum line that runs up into the engine compartment, and just hangs there ).

This is the block diagram of the vacuum lines for the IWE ( not actual routing ). You can use a vacuum pump / gauge to see if the lines will hold vacuum. Don't be surprised if the vacuum lines test OK, there is a TSB on the IWE solenoid where it could ingest water, and allow water in the lines, which will not keep the IWE gears disengaged.

Block diagram of the IWE system


TSB on the IWE solenoid ( right click save as )
http://my.voyager.net/~sscully/file_tsb06_08_15.pdf

The engine and emission control system covered by this information operate on a combination of vacuum and electrical signals; they are extremely prone to malfunctions due to improper vacuum connections. If a component does not receive vacuum at the correct time, it cannot function when needed. When working under the hood, pay close attention to the routing and placement of every hose.



Fig. 1: The vacuum hoses are usually numbered for easy identification



Fig. 2: Vacuum hose routing-1984-85 carbureted Prelude





Fig. 47: Emission component schematic-1984-85 carbureted Prelude




Hope this helped; TY for using Fixya (remember comment and rated this).

possible

Look for a vacume leak.

Check vacum at brake booster if you have vacum there bad brake booster, if you don't follow vacum line check there, vacum line should go to intake, if you do have vacum replace vacum hose.

Carefully look over what you did, make sure you examine every plug, wire,vacuum line and connection. If it was running before the job then more then likely you accidentally forgot something.

There is a vacum powered actuator on the front differential housing on the passenger side. It pushes one way for 2WD and the other way for 4WD. If it gets an erratic vacum signal it can cause the clicking as it goes between 2WD and 4WD. It gets it's vacum from two valves mounted on the firewall just behind the battery(to left). The white line feeds manifold vacum to the valves. Check for vacum at white line with engine running. If no vacum there is a break in line from manifold (not likely in this case). If vacum check the pink and blue lines by applying vacum to each one. The vacum should hold. If not check lines from valves to vacum actuator. If both lines hold vacum check valves. Remove electrical connectors from both valves. Connect a wire from one of the terminals of the valve to ground. Touch a wire from the battery + to the other terminal of the valve. Listen for a clicking sound. If no sound valve is bad. Replace valves(s). Also have someone watch position of actuator shaft as you move the selector between 2WD and 4WD. There should be movement. If there is an intermittent problem sometimes it will and other times it won't.