HELP! H22a1 (OBD1) to H22A4 (OBD2) - Honda Prelude Forum

kmarrs · 12-04-2011, 06:50 PM

Okay so i have a 94 prelude with a H22A1 that is shot. I've been looking around for another h22 in my price range and have finally found an h22a4 (1999). What i need to know is it manageable, can a swap from OBD1 TO OBD2 be done? What parts will i need? the h22a4 has an auto tranny and mine is currently a 5-speed standard trans. I would like to keep the old tranny and run the h22a4.

I have spent hours searching trying to find a straight answer.
If someone has a link i could read or some information it would help me out HUGE and I'm sure a few others as well.
The motor also comes with an Apexi VAFC chip can i use that on the swap?

Thanks.

minilogoguy18 · 12-05-2011, 05:13 AM

You are wasting you time thinking about it, you're doing it backwards. Use your old distributor, injectors and throttle body on the H22a4 and bam, OBD1 H22a4. You'll have the crank angle sensor on the oil pump but just let the plug hang or remove the sensor. Use your old ECU, VAFC is junk.

kmarrs · 12-05-2011, 07:31 PM

thanks a million! you made life simple. I'm pondering the idea of having a shop do the work but i think it would save allot of $ and be a good experience of doing the swap with some friends. Scale of 1-10 is it very hard me and my friends are pretty mechanically inclined i haven't done a swap myself though.
Thanks for the advice.

minilogoguy18 · 12-06-2011, 05:28 AM

Also forgot but this may be obvious at this point, use your old engine harness. You should also overhaul the new engine before swapping, t-belt, water pump and all seals so that you can just drop it in and not worry about anything for a long time.