im in the middle of a obd0 b16a swap into a 89 crx si the only thing left to do is the wiring harness, i already have the vtec harness wired, should my stock harness work for the motor? the one that came on the b16, has a big plug on the driver side that doesnt fit.. the motor that was in the car before is a d16y7, is this harness gonna work??? the injector plug seem to be a different color....IM stuck!

 

use your stock si harness with the 4 additional 4vtec wires wired in.

 

sick, i already got the vtec wired and pinned, so the rest of the harness, should be plug n play?? anything else i should know??

 

im gonna assume that because you said the injector plugs are different color that you were running the stock y7 manifold. so...
white plug....obd0 injector
grey plug....obd1-2 injector

the harness that you are planning to use, is it a stock b16 harness or usdm si harness? you might have it flipped. driver side on the passenger side. pics would be helpful.

 

when i got the car it had a motor from a 98 dx -d16y7 it was running a obd0 and ecu....i got a b16a from hmotors...the harness on the b16 does not seem to work because of the bigger plug on the drivers side...So what i am asking is if i can use the harness that was already on the car... heres some pics

right plug -crx harness / left plug b16a harness

 

those should clip together unless you have the wrong harness or its on backwards...is there a resistor box up there?

 

OLD d16y7 OBD0


NEW B16A OBD0

 

Beautiful Motor from Hmotorsonline.com-- would def. order from them again!!

 

LOL- there different SIZESS, the left plug is off the motor i got, is alot larger 2x the size of the plug that goes into the firewall.. you can see that in the pic.. I think it might be a second gen b16a..??....

 

yeah theres a resister box up there, i dont have it backwards, it was on the motor when i got it

 

looks good

 

thanks, Love the fresh engine bay paint, Finally matches the exterior paint, lol--i love a clean bay- got a red mugen valve cover on its way in the mail, gonna look sick, ill post pics when it comes!

 

You don't use the harness that comes on the B16a. You need to put your SI harness on the B16a and then you can just plug it into the car's harness. Some of the wires on your SI harness will probably need to be lengthened (mine did).

Also, don't forget to switch your O2 sensors. As you know, the B16a has two O2 sensors with a different plug on each one. The SI harness has a single plug and the O2 sensor on the B16a that it plugs into is the wrong one. You need to switch the pins at the ECU (if you have already wired up the new O2 sensor wire).

 

Very important to have both o2 sensors hooked up correctly, had mine the wrong way at first and it ran like ****. Didn't idle right until the vaccum lines were correct also.

 

i got the diagram for the vaccum hoses, but ill have to look up how to do the o2 sensors, on more question, theirs a vaccum hose that comes from the black canister to directly above the throttle body opening, well, the brass connector broke off in shipping, so i can't hook up the line there, is this going to affect performance? I would put a pick up, but the cars at my mechanics getting the wiring harness done.

 

yoo ElectronED9 im in the same situation but i dont now how to wire any of this **** but wana learn i have a 89 civic dx hatch back with a b16 a3 engien damn i would be glad if u could help me out wit the wireing im new at this stuff thats why thanx

 

^^^^
first off is the car already converted to mpfi???

 

na how do i do that ??

 

if the car is an Si then it's already mpfi

 

hi i hope someone looks at this i have me a 91 civic si i put in my obd0 b16 with the obd0 ecu and it runs good i just was thinkin of switcing it over to obd1 cuz i have a p28 with hondata left over from my last build an was wonder can anyone give me some pointer on gettin this dose i have the jumper harnnes an wanted too know is there any help out here