Manual transmission or automatic? Most likely this is the transmission vent. It may have had a short rubber hose hooked to it, 2 inches long. If this is the vent, it doesn't need the rubber hose on it to function.
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Get some boxes, bags and a sharpie marker to put things in and label them if this is your first time. Disconnect and remove battery and metal battery tray, unplug ALL wires and lines that connect to engine including AC lines that are in the way and the throttle cable and cruise control cable. Keep the plug wires hooked to your distributor so you don't lose your firing order. Drain radiator and remove it. Remove the top hose and use the long lower hose to push over the outlet where the top hose was to contain what is left in the radiator. Automatic cars will require disconnection of the transmission cooler lines from the bottom of the radiator. Open gas cap before disconnecting fuel line on intake to relieve pressure. Remove front wheels and separate bottom ball joints from lower control arms on each side, separate both outer tie rod ends from knuckle. Drain transmission fluid, pop out both axles from transmission. They can hang. Disconnect shifting linkage. Disconnect exhaust down pipe (or) disconnect tailpipe at the end of braided hose just before the catalytic converter. Mainly, get it to where the motor is just sitting there in the cradle with nothing holding it but motor mounts. Hook a chain to the pick bracket on the head near the power steering pump and to the one on the transmission. Feel free to remove the 17mm bolts in each mount as well as any brackets for these mounts that obstruct your ability to pull it up out. I have found that pulling it out on an angle with the transmission being lower helps your mood! The 4 motor mount locations are as follows: Front Center - Left - Right - Rear Center. If you are replacing this 90-91 engine with a 92-93 you will need to reuse your AC compressor and it's bracket, the down pipe and the header and the wiring harness on the engine.
1991 honda accords had a recall on the ignition control module this in the distributor more commonly known as the igniter. call a honda dealer with your vin number and they will tell you yours has been replaced or not. Mine was so had to to buy one at auto parts store for $60 .kinda expensive for this little chip with 4 wires.
I recently replaced the fuel pump on my 87 LXi. Drop the seat, and pull back the carpet from the trunk. You'll see two little round cover plates tarred to the floor right behind the seat back. Pry the driver side plate loose, and you'll see the cover for the fuel pump assembly underneath - it has a plug, a banjo bolted fuel line, and vent hose attached to it. Remove these, and remove 5 or 6 nuts with a 10mm socket, and lift the fuel pump assembly out, taking care to tilt it accordingly while lifting.
Before removing it though, take the plug loose and use a voltmeter to verify that you get 12vdc to the pump when the ignition is turned on. You should see the 12v for 2 seconds after the key is turned.