dmoore2920

i have a 96 lx civic. i just put a b16a in it. it runs beastly. i put the b16 harness and ecu in it. and there is no under dash plug that goes into the ecu. so it only has two plugs and the green one. first off. wen you start it. it takes a while as if it dont wanna start. and also main concern. the speedometer dont work. vss gud. speedometer gud. help. wat the hell is that plug.

Matt93eg

Your information seems vague to me. What ECU are you running? Your car is a 96 so its OBD2. If your running an OBD1 P30 ECU then you will need to get a OBD2 to OBD1 Conversion harness so you can correctly plug in the OBD1 ECU. Or, get your hands on a 99-00 Civic Si(EM1) P2T OBD2B ECU and run that.

94EG8

You can't use an OBD2B engine harness with an OBD2A underdash harness, otherwise you will end up with the issues you're having. Run an OBD2A civic engine harness (ideally this would be a '96 - '98 5 speed EX harness, otherwise you'll have to add vtec wiring and convert from a 3 wire to 2 wire IACV, you will also either need an OBD2A P30 from a '96 - '97 Del Sol VTEC or an OBD2A to OBD2B conversion harness. You can alternatively run a '99 - '00 Si underdash harnes with the Si engine harness.

dmoore2920

thanks for the replies. but to 94eg8. if i get that 96-98 engine harness. will it work on all the sensors and switches. and what will i have to do in all? cuz dese cops is out. n my speedometer aint helpin.

94EG8

If you get a '96 - '98 5 speed EX harness the whole thing will be plug and plan, other than you will need to manually run the wiring for the secondary O2 sensor. All other '96 - '98 harnesses are going to require some minor modifications.

dmoore2920

it took a while for me to get back. but do u kno where i can get this harness from. cuz i tried ebay. craigslist. everything. the only place i could find it was honda. n it aint cheap

toyotaninja

does it have to be a 5 speed harness or will any ex harness work?

thanks for the help.

94EG8

5 speed requires extra work for the IACV and starting circuit and IIRC the backup lights. It's easier to add the vtec wiring to a 5 speed Y7 harness than to mod an automatic Y8 harness.

219

thats is true, now adays u can go one ebay and type in "vtec subharness) they are 25 bux and u use the y7 harness... check local craigslist for the harness

toyotaninja

thank you very much for the information pertaining to the vtec subharness i was able to find one at rywire.com that requires no soldering. im sorry if i am asking stupid questions but need to know what a 96-98 civic cx engine harness needs to work with a b16 other than the vtec subharness and o2 sensor extension.

94EG8

IACV wiring needs to be converted from a 3 wire to a two wire setup, see below:

HondaPartsHero

You'll also need to place your intake air temperature sensor into the intake arm as the B16 won't have a place on the intake manifold for it. The CKF sensor plug by the crank also may need to be swapped over for a two wire plug. You will need a subharness for VTEC and the knock sensor. As stated above you will need to extend the second O2 and swap to a two wire IACV plug. Check my signature below for anything you might need.

toyotaninja

does anyone have a schematic or a picture of a civic ex engine harness because as far as i can tell the harness i have in my car has been swapped for a ex harness and is not the cx harness that i thought i had. the problem is i have two plugs missing and i need to know what the knock sensor plug looks like.