b16gurl

hey all...i have a 1993 honda civic si hatchback and i sold my motor and want to just stick a vx motor into it....i have the motor in the car and it runs but it is running really ruff... now i realize that the 02 sensor has five wires and should have 4...which one do i cut ???? all help is much appreciated...

b16gurl

bump...no one knows???

Luserkid

You need to rewire your car for 5 wire if your running the VX ecu.

littleredcivic

do you have EGR control? the SI is missing lots of wires compared to the VX. The VX has an EGR and wideband o2, the SI has a standard heated o2 sensor. if you are using the SI ecu, you can not control the EGR and that is most likely making your car run rough. if you are using the VX ECU and did not add the wires, you have no o2 reading and no EGR control...

b16gurl

wat would i have to re wire...i am running the vx ecu...the vx engine wiring harness....but the wires attached to the engine bay going into th ecar contecting the ecu to the engine is from an si....wat would i have to add for wring??? any help is much appreciated...thanx

SVOboy

VX uses a 5 wire, so keep that, check the EGR too, that could be causing problems.

SVOboy

PS: Good luck with the swap, I'm gonna do it to my 91 crx also, go d15z1!!!

littleredcivic

you should notice that you have an extra plug from your vx engine harness that has 8 pins i think. this plug contains the o2 and egr wires. you need to run all those wires to the ecu. use your helms and determine the pinout.

neutron91

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by littleredcivic &raquo;</TD></TR><TR><TD CLASS="quote">you should notice that you have an extra plug from your vx engine harness that has 8 pins i think. this plug contains the o2 and egr wires. you need to run all those wires to the ecu. use your helms and determine the pinout.</TD></TR></TABLE>

exactly what i was about to say... how did you not notice that extra plug while plugging up the other 3 plugs on that side of the motor??

b16gurl

my computer already has all the wires going into it though...there are no empty spots...so i guess i would have to splice into it....now would it be easier to get a harness from a vx that connects the engine harness to the ecu? i see the other plug that is not plugged in. i think it is easier...just harder to find in the junkyard. would that solve my problems if i do that??

littleredcivic

you can buy a harness, but it is not all that fun to swap the chassis harness. your easiest way will be to add the wires, but you will need to find the pins for the ecu side.

b16gurl

now...did all 1992 come with a four wire harness??? or was it strictly vx cars... cuz it will probably be nearly impossible for me to find that harness down here in t.o. and if the 1992 didnt...where and how would i be able to figure out wiring from the plug to the ecu?? would i have to splice it?? also...thank you for the help guyz u have helped me out alot...it is much appreciated.

neutron91

all vx's from 92-95 have 4 plugs on the passenger side shock tower... as stated before this plug contains the wiring for the o2 and egr... the easiest and cleanest way i can think of to do this in your case would be to get a plug that will plug into the extra plug on the vx harness then run and repin those wires to the ecu side... this way it will look stock and you wont have some ghetto wires all throughout the engine bay... pick up a helms... it has all the wiring diagrams you will need

littleredcivic

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by b16gurl &raquo;</TD></TR><TR><TD CLASS="quote">now...did all 1992 come with a four wire harness??? or was it strictly vx cars....</TD></TR></TABLE>

vx comes with a 5 wire o2 harness is most cases, its for the wideband o2 sensor.

neutron91

im thinking they were meaning a 4 plug harness not a 4 wire harness... atleast thats the way i took it

b16gurl

yes...thanx for the correction thats wat i ment...4 plugs....was it only vxs..that came with it...or did it come in like all 92's and the fourth plug was just not used??? also..wat is a helms??? like a haynes manual or somethning diagnosing wiring problems??? thanx guyz

littleredcivic

no, you should have an extra plug from your engine that had nothing to plug into on your car. only the vx had the extra plug for the wideband and egr control. helms is the publisher of the real HONDA service manual.

b16gurl

where do i get this helms honda service manual...and also...since i do hav ethat extra plug where in the ecu would it plug into...all the spots are full?

littleredcivic

there is nothing to plug into...that is the problem. you are going to need to make your own connector and run it into the passenger compartment to connect to your ECU. order your helms manual from helminc.com

b16gurl

damn...i think i am better off spending the hour and 500 bucks and buying a d15b because this is getting a bit tedious.. i never knew i would have such a problem with this car...i apprciate all teh help everyone

b16gurl

Anyone kno where to get cheap full swaps in ontario???? looking for a b16 or a d15b....please leave a location if u kno...thanx

littleredcivic

cheap may not be the best, the best will not be cheap. are you doing this swap on your own?? your civic is an SI right? why not just put a replacement back in there for cost and simplicity? they are cheap and always available.

b16gurl

it is an si... 800cad sound right for a d15b with ecu and tranny????? i have been calling around... thats wat they are around... i was thinking of that...but the cars rep at one ppoint in time was not some dinky d series motor...people know this car had power once and now that i own it i want to show them it still does.

littleredcivic

a d series motor regardless of origin unless assembled for race or sport use will not be amazing in any way. 800CDN is a fair price for what you are listing if the unit is in good condition. if you want power, you might as well just save your money and get a B , H, or K setup in the car. another thing, don't waste your money to prove the car has power. its not how much, but how its used.

b16gurl

i just got the harness out of a vx....i cut it under the dash ...using the helms it should wire up correct?? honestly..i am now thinking it is easier to just throw in an si motor than chop the harness and connect everything back up withthe vx harness.