alwaysbroke

Hello everyone, well im getting ready to do a h22a swap in my 99' Si and i have a question. what do i do for wiring, and a computer? i see a lot of info. for SOHC civics.... but what about Si's? do i need to keep my wiring harness or use the H22A wiring harness? should i use my computer or one from the H22A? thank you very much.

Newman

You need to be more specific..... what year is the motor? What year and what model is your ECU? W/out that info, we cannot help you out. Also, check out a search in this forum as you'll find lots of Civic wiring threads for both SOHC and DOHC cars (which doesn't really matter... it matters whether your car & swap is OBD-1 or OBD-2)

alwaysbroke

Im OBD2, 1999 honda civic Si, i have stock computer, its a pt3 or something like that.if someone can please tell me the computer i need to use for the H22A swap.The H22A im using is obd2 from a late model prelude.thanks

poison

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by alwaysbroke &raquo;</TD></TR><TR><TD CLASS="quote">Hello everyone, well im getting ready to do a h22a swap in my 99' Si and i have a question. what do i do for wiring, and a computer? i see a lot of info. for SOHC civics.... but what about Si's? do i need to keep my wiring harness or use the H22A wiring harness? should i use my computer or one from the H22A? thank you very much.</TD></TR></TABLE>

I would definitely adapt your factory Si harness to the H22A.

It would be the same as adapting any Civic, with extending alternator cables, changing fuel injector plugs, etc.

You, just mainly need to wire up EGR and IAB (although not required), but KS and VTEC is already existant.

I would suggest using an OBD2 P13 or converting to OBD1 with a jumper harness using an OBD1 P13, P72 or chipped P28.

HTH.

alwaysbroke

so can i just extend alternator cables, changing fuel injector plugs, and other adaptations and run my stock 99-00 Si computer? without wiring the EGR and IAB.Will the motor run?

poison

yes. just simply adapt the Si harness to the H22. VTEC solenoid and such will plug right up.

alwaysbroke

Ok, if i do not wire the IAB and and the EGR to my stock ECU and stock wiring harness, what happens? will the car still run ok?if anyone forgot this is a 99 civic Si

novacivic14

I need help , I have a 99 si with a h22a obd1 swap , it needs and ecu , I don't know what ecu it need or what wiring it need , I aam new to the swap so I have no idea

HondaPartsHero

Use your harness although you'll have to adapt a few things: intake air temp sensor (put into whatever intake arm you plan on using), distributor wiring (not sure maybe someone can chime in), alternator wiring (either use an OBD2 H series or use an adapter harness), reuse your injectors. As far as ECU you can use an OBD1 P28 chipped for H22 or an OBD1 P13 but know that if emissions testing uses a scanner in your area you'll fail with both these ECU's. The P28 would be better because you won't have to wire up EGR, knock, etc. If you go the OBD2 ECU route you're going to run into more emissions related wiring and additions.

Read this thoroughly

https://honda-tech.com/hybrid-engine...ere***-650329/