hello guys, i'm new here and to the prelude family. not new to hondas though, i guess you can say i started backwards, K-series is what i'm familiar with, building an all motor k24 rsx. And this is how i became a prelude owner, bought a car to be my DD when i go to take the k20 out of the rsx. i bought a 99 base shell from one of my buddys, amazing condition for 800 bucks, dare say its in better shape than my rex. but obviously, it's a shell with no motor. i have a transmission, driveshafts, everything, except the motor(even have a head that he said needs 2 new valves, no biggie, but might as well buy a whole motor)
i'm not looking to build the car/motor in any way or shape, just looking for a clean bolt-on DD prelude. but in researching, i've come into some confusing things on what motor i can use. it's supppose to be the h22a4, having trouble locating one fairly local for a decent price (upstate NY, if theres anyone out there) i've found a couple obd1 h22a motors though, with wire harness ecu and even trannies. what would i need to make this work, and still pass obd2 emissions. as i said, unfamiliar with h and b motors. i've heard just using obd1 motor, jumper harness and obd2 computer will work 100%, true? if so, i might as well do this.
EDIT - some have also told me i need to change a couple sensors on the obd1 motor around, some have said i just need to change around the dizzy to a h23 motor dizzy
You've been told just about all there is to it. I don't know anything a bout jumper harnesses so I can't help you there. You'd need to change a few things from the OBDI H22 to the OBDII h22, such as the crank sensor, dizzy, and other things I never could remember.
It's going to be a lot cheaper if you buy an H22 and convert it to OBDII.
You've been told just about all there is to it. I don't know anything a bout jumper harnesses so I can't help you there. You'd need to change a few things from the OBDI H22 to the OBDII h22, such as the crank sensor, dizzy, and other things I never could remember.
It's going to be a lot cheaper if you buy an H22 and convert it to OBDII.
so unless i can find an obd2 h22a4, my best bet is to find an h22a or h22a1 and convert it to obd2 by swapping the few things i need(need to find out what). what about ecu/wire harness, all the same?
The wire harness for OBDI and II are not the same, but in order to pass emissions you'll need to run a stock OBDII ecu. I do not know if there is such thing as an OBDI>II conversion harness, I only know there is a II>I which is popular for people trying to easily convert to the more simple OBDI.
With that said, There are parts off of an OBDII H22(a4) that you now need to convert an OBDI H22a over to OBDII. I know you need those parts. You'll need to figure out exactly what you need though, since I don't know.
I feel like I forgot something.....does that help you?
2) Replaced ALL of the exhaust system nuts (Cat, A Pipe, and Exhaust Header).
3) Replaced the OEM A "flex" pipe with a low mileage one I got for $75.00 from a dude in CA. (Mine had 120k on it and was getting quite worn.)
4) Moved over the following from the old H22A4 motor:
a) Wiring Harness (OBD-II)
b) Distributor
c) Coolant Thermostat Housing
d) Oil Pump Housing
e) Crank Position Sensor and Top Dead Sensor (attached to OBD-II oil pump)
f) Exhaust header (JDM 4th Gen is different)
g) Intake manifold (if not using 5G IM, then move your fuel injectors over and get a 4G MAP sensor)
h) Knock sensor (BE VERY CAREFUL TAKING THIS OFF, THE CONNECTOR BREAKS EASILY)
i) Oil Pressure Sensor
j) Oil Pan & baffle
k) Oil Pan/Transmission Stiffener
l) Various gears from the timing belt side (crank gears especially - required for CKP/TDC sensors)
m) VTEC solenoid pressure switch (the connector seemed to be different on the H22A one?)
-There are quite a few things that need to be swapped from your obd2 5th gen h22a4 motor to the obd1 jdm h22 motor to make the swap go nice and smooth. Here goes…
-The jdm intake manifold, from what I’ve read, is the same as the 5th gen intake manifold. If you would like to use the jdm intake manifold and throttle body, you will need a 4th gen firewall mounted MAF sensor. If you would like to avoid purchasing the 4th gen MAF sensor, then use the jdm intake manifold with the usdm throttle body by swapping your throttle body over to the jdm motor. However if you'd like to make things as simple as possible, just use your 5th gen intake manifold and throttle body.
- Here is the bulk of what you'll need to swap into the JDM H22A from your H22A4:
Oil pump housing + TDC & CKP sensor, distributor, alternator, ignition coil, thermostat housing, 5th gen obd2 engine wiring harness, alternator bracket, the knock sensor and the timing and balance belt sprockets.
-If you plan on running obd1, you'll need an obd1 ecu (JDM or USDM), 4th gen VTEC injectors (Peak & Hold 310 cc), an obd1 resistor pack (from any Honda), and an obd2a-obd1 ecu conversion harness.
-With your JDM H22 in your possession, there should be a few things that you should do to ensure that it has a long healthy life. First, obviously, you’ll need to swap all of the parts that I mentioned above from your H22A4 to your JDM H22. After you’ve swapped all of those parts over, I would recommend:
-Valve Adjustment tool to do a valve adjustment
-Aftermarket Cam seal (STR, Golden Eagle, Forum Racing, etc.)
-Valve Cover gasket set with spark plug well grommets (might as well do this since you’re going to be taking off the valve cover to replace the cam seal)
-OEM Honda Rear Main Seal (why not? They’re only $11-$12 from majestichonda.com)
-OEM Honda Water pump (I don’t think I need to give an explanation of why the water pump and timing belt are extremely important)
-OEM Honda Timing Belt
-OEM Honda Balance Shaft Belt (if you’re not going to keep your BS belt off)
-OEM Honda Manual Tensioner conversion (the whole thing can be purchased from importrp.com, they include every part necessary for the conversion for $89.00)
-Spark plugs, Distributor Cap, Distributor Rotor, and Spark plug wires.
-Both Accessory belts (alternator and power steering belts)
there is a harness for obd1 to obd2 but it isnt for the engne/ecu harness it is for the dizzy,, this will eliminate havign to swap out the obd1 oil pump for an obd2 fro the cps cps, you can find them on import replacement parts for like 20 bucks. This will help alleviate some swap work.
there is a harness for obd1 to obd2 but it isnt for the engne/ecu harness it is for the dizzy,, this will eliminate havign to swap out the obd1 oil pump for an obd2 fro the cps cps, you can find them on import replacement parts for like 20 bucks. This will help alleviate some swap work.
really? so i wouldnt have to change any sensors around, just plug and play?? and the obd2 ecu will read everything right and pass obd2 plug in emissions? damn this is complicated compared to the K's
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Thanks for the backup indy.
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