H22A4 Swap Question? - Honda Prelude Forum

H22Honda82 · 03-20-2003, 09:06 PM

I just bought a H22A4 (OBD2) and I have a 92 Si which had the H23A1 (OBD1) am I goin to have any wiring problems since I am droping a OBD2 motor in my car. Please I really need help on this.

H22a_Assasin · 03-20-2003, 10:39 PM

Nope, no problem at all.

But here's what you need to do.

What determines OBD is actually the ECU. You'll need to get an OBD1 P13 ecu from any 92-95 Prelude VTEC.

Then you'll also need the fuel injectors/fuel rail from an H22a1 (~310cc, peak and hold injectors) The fuel rail on an H22a4 has the inlet on the wrong side. You can reuse your H23a1 fuel rail.

Also, you'll need to reuse the H23a1 distributor too. The H22a4 dist doesn't allow you to adjust timing, due to a crank angle sensor by the timing belt. But since you're switching back to OBD1, you don't need to connect that CAS.

Then it's only a matter of wiring in the VTEC wires....which you might already have wired in your chassis.

Red4WS · 03-21-2003, 02:30 PM

a little off topic, but the prewired vtec wire is the blue wire above the passenger fender?

vipastyle · 03-21-2003, 04:21 PM

www.hondata.com can answer all your OBD and ECU questions if you have any specifics...

Forbidden · 03-21-2003, 05:27 PM

ASRprelude: check out my write-up at http://vgmidi.com/~jrc/engineswap and email me if you have any questions. I did that exact same swap

H22Honda82 · 03-22-2003, 11:00 PM

So Would I have to get a P13 OBD1 ECU to get swap done right because I am geting a OBD2 ECU with the motor because it is from the 97- up H22.

vipastyle · 03-22-2003, 11:40 PM

i think thats correct...

Satan_SRV · 03-23-2003, 01:40 AM

Just use an OBDI P13 to save you any hassle...no sense trying to use an OBDII ecu

like buddy said use your H23A1 distributor as well so you don't have to rewire anything

H22Honda82 · 03-23-2003, 02:28 PM

Thanks Everybody for your Help I really apriciate your guys help Aloha to all of u

racemode · 10-26-2009, 12:29 PM

my prelude has been sitting complete with swap but wont fire ,,,
i swaped everything from my h22a1 to the new h22a4 intakes,harness,fuel,rails,injectors,distributor,e verything.

it turns over but sounds ruff i removed the ex-manifold and notice the 1 and 4 are pushing out fuel and air but 2 and three are pulling air back into the head ?? i have been researching this prob for awaile and dont understand this distributor issue i took of the a4 distributor and put the a1 on and left the sensor unpluged bye the cam cover is this an issue ? the harness is odb1 and the ecu are odb1 injectors are odb1 everything is pluged in except for the sensor at the bottle bye the crank .. and the distributor can only go in one way so i know iam not 180 out the #1 piston is at (tdc) cam are in line but ex-port 2 and 3 are sucking air in does anybody know what would cause this or anything i could try to start this car ran fine before the swap thank you ,,,,,any help would be great ,,ps i check it agian the 2cond and third do push out but no where near as much as 1 and 4 they do have slight pull back ??