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twntrbocivic · 06-11-2009, 10:11 PM

i just bought a 1990 civic ex sadan i was wondering what is all involed to wire in a 1991 ls motor any help would be great

CAFROG · 06-11-2009, 10:17 PM

Complete motor/trans/axles/ecu needs to be LS OBD0

You need the aftermarket mounts for your EF with a b-series

I think you need the si engine harness but could be wrong and any EF harness will work

I'm not too sure on the wiring harness issue but you can search on this forum and find out

pappaj · 06-11-2009, 10:29 PM

does the car have mpfi.

CAFROG · 06-11-2009, 10:44 PM

Its an EX....does that mean it is already have MPFI??

D16SiHatch · 06-11-2009, 11:40 PM

Quote:

Originally Posted by CAFROG

Its an EX....does that mean it is already have MPFI??

yes

twntrbocivic · 06-12-2009, 05:19 PM

yea it has 4 injectors allready i just dont know much about the ef i have a eg swaped allready i just wandering what wiring was involved with this swap thanks for help so far guys

twntrbocivic · 06-12-2009, 05:21 PM

also i am new to the forum so where would i look to fing the wiring diagram that needs done any help would be great thanks

pappaj · 06-13-2009, 08:16 PM

There is alot of info on that swap. I did the same swap to my 89 crx si, just with the info on this site.

With mine I used the stock si engine harness, I needed mounts, 90-91 integra axles, 90-91 integra ecu, injectors, injector resistor box, and shifter linkage. I didn't have to do any actual wiring besides extending the o2 wire. It is pretty much plug and play. The toughest part was figuring out the vacuum lines but there is a ton of knowledge around here.

You need to ask specific questions as they arise.

twntrbocivic · 06-14-2009, 01:04 AM

thanks man i was thinking that but wasnt sure

nick3538 · 07-04-2009, 03:42 PM

The si harness, Is that the one thats MPFI? Or is there a diffrent one? Mine was converted from dpfi to mpfi and im having the same question about the wiring swap.

blasterman87 · 07-04-2009, 06:20 PM

the ex sedan has the same engine/harness as a 88-91 si, its a d16a6 and everything will plug in. mounts are b series mounts, axles are 90-93 teg for driver side and 90-01 teg for pass side(i believe those years are the same for pass side, as i have a 95 pass axle in my ef)and shif linkage, either buy it or modify 90-93 teg. if the engine is obd1 then you will need a obd0 ecu and dizzy, if its already obd0 then everything will work

nick3538 · 07-05-2009, 01:43 AM

Freakin sweet. Thaks for the info man

06-11-2009, 10:11 PM	#1
twntrbocivic Greenhorn Join Date: Jun 2009 Age: 26 Posts: 5 iTrader: 0 / 0% Rep Power: 0	1990 civic ex ls swap ?'s i just bought a 1990 civic ex sadan i was wondering what is all involed to wire in a 1991 ls motor any help would be great

07-04-2009, 03:42 PM	#10
nick3538 Junior Member Join Date: Apr 2008 Location: Arkansas Posts: 2 iTrader: 0 / 0% Ride: 88 honda civic hatchback Rep Power: 0	The si harness, Is that the one thats MPFI? Or is there a diffrent one? Mine was converted from dpfi to mpfi and im having the same question about the wiring swap. __________________ 88 honda civic ef hatch. d16a6 motor swap.

07-05-2009, 01:43 AM	#12
nick3538 Junior Member Join Date: Apr 2008 Location: Arkansas Posts: 2 iTrader: 0 / 0% Ride: 88 honda civic hatchback Rep Power: 0	Freakin sweet. Thaks for the info man __________________ 88 honda civic ef hatch. d16a6 motor swap.

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06-11-2009, 10:17 PM	#2
CAFROG Senior Member Join Date: Apr 2009 Location: NOR-CAL Age: 33 Posts: 978 iTrader: 0 / 0% Ride: '92 Hatch si w/B16 (wannabe EG6) Rep Power: 26	Complete motor/trans/axles/ecu needs to be LS OBD0 You need the aftermarket mounts for your EF with a b-series I think you need the si engine harness but could be wrong and any EF harness will work I'm not too sure on the wiring harness issue but you can search on this forum and find out

06-11-2009, 10:29 PM	#3
pappaj Senior Member Join Date: Feb 2008 Location: woodstock Age: 25 Posts: 133 iTrader: 0 / 0% Ride: 89 CRX SI (LS) Rep Power: 5	does the car have mpfi.

06-11-2009, 10:44 PM	#4
CAFROG Senior Member Join Date: Apr 2009 Location: NOR-CAL Age: 33 Posts: 978 iTrader: 0 / 0% Ride: '92 Hatch si w/B16 (wannabe EG6) Rep Power: 26	Its an EX....does that mean it is already have MPFI??

06-12-2009, 05:19 PM	#6
twntrbocivic Greenhorn Join Date: Jun 2009 Age: 26 Posts: 5 iTrader: 0 / 0% Rep Power: 0	yea it has 4 injectors allready i just dont know much about the ef i have a eg swaped allready i just wandering what wiring was involved with this swap thanks for help so far guys

06-12-2009, 05:21 PM	#7
twntrbocivic Greenhorn Join Date: Jun 2009 Age: 26 Posts: 5 iTrader: 0 / 0% Rep Power: 0	also i am new to the forum so where would i look to fing the wiring diagram that needs done any help would be great thanks

06-13-2009, 08:16 PM	#8
pappaj Senior Member Join Date: Feb 2008 Location: woodstock Age: 25 Posts: 133 iTrader: 0 / 0% Ride: 89 CRX SI (LS) Rep Power: 5	There is alot of info on that swap. I did the same swap to my 89 crx si, just with the info on this site. With mine I used the stock si engine harness, I needed mounts, 90-91 integra axles, 90-91 integra ecu, injectors, injector resistor box, and shifter linkage. I didn't have to do any actual wiring besides extending the o2 wire. It is pretty much plug and play. The toughest part was figuring out the vacuum lines but there is a ton of knowledge around here. You need to ask specific questions as they arise.

06-14-2009, 01:04 AM	#9
twntrbocivic Greenhorn Join Date: Jun 2009 Age: 26 Posts: 5 iTrader: 0 / 0% Rep Power: 0	thanks man i was thinking that but wasnt sure

07-04-2009, 06:20 PM	#11
blasterman87 Senior Member Join Date: May 2009 Age: 22 Posts: 340 iTrader: 0 / 0% Rep Power: 5	the ex sedan has the same engine/harness as a 88-91 si, its a d16a6 and everything will plug in. mounts are b series mounts, axles are 90-93 teg for driver side and 90-01 teg for pass side(i believe those years are the same for pass side, as i have a 95 pass axle in my ef)and shif linkage, either buy it or modify 90-93 teg. if the engine is obd1 then you will need a obd0 ecu and dizzy, if its already obd0 then everything will work

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1990 civic ex ls swap ?'s