jdmsir4dr

So Its my first time doing a swap..i put a obd2 ls in to my 98 civic lx i used the stock harness ...so today i starded the car on after i finished putting it in it turned on. So i try to rev it and as soon as i try to tap to rev it bogs..i have 3 plugs unplug..i was told one is for the sensor dats right by the oil pan the other is for the piece dats bolted to the intake and the the other plug idk what its for...HELP PLZ

jbpnoman

First off, what ECU are you using? If you're still using the LX ECU, you need to replace that with an OBD2A LS ECU.

Once you've verified you're running the correct ECU, plug in those sensors, and pull and post all the codes you're throwing. Also check your mechanical and ignition timing.

slowDB7

what he said

its defiantly not gonna run good with sensors unplugged

doctorake

What ECU?

grumblemarc

iTrader: (4)

Hybrid forum. Just like the others are asking; What ECU are you using? Check timing after that.

jdmsir4dr

i have my stock lx ecu till i get the LS obd2a ecu but cant find one at the moment ..Question once i get the ecu i need to do the Mods below Correct me if im wrong..Are those the only mods that are needed to be done to the Stock Lx harness?

- 3 wire to 2 wire IACV
https://honda-tech.com/forums/honda-civic-del-sol-1992-2000-1/3-wire-2-wire-iacv-1903898/

-CKF bypass trick
http://www.ff-squad.com/technet/ckftrick.htm

HondaPartsHero

Don't use the y7 ecu, you're going to blow something up. Is your engine JDM or USDM?

jdmsir4dr

Dam i didnt kno dat .. I only turned it on 3 times but like for 30 sec ..usdm it came of a 97 integra

HondaPartsHero

Ok then you'll only have to do the 3-2 wire IACV. Your CKF will probably have to swap plugs to get it to plug and play as I believe the b series is two wire and the d series is 3.

jdmsir4dr

Ok Another question..What about that plug dat connects to that sensor thats circled in red in the pic below....is that the IAB Sensor? Do i use that sensor of the y7 intake on the LS Swap or what do i need to do

HondaPartsHero

That's evap purge,you will probs LY have to swap plugs on that one as well if the the LS engine has a different style. The intake air temp sensor has a similar style plug as well (it's the sensor that sticks out of your air box) you'll have to either put that into your intake arm or swap plugs.
https://honda-tech.com/forums/honda-civic-del-sol-1992-2000-1/92-00-honda-engine-swap-wiring-guide-vtec-non-vtec-2987229/

nealnanoHX

Ok those plugs need to be plugged in and if they dont then you need to rewire and repin the ECU harness. I did the same swap in my 98 Hx, 99 B18B1, P75 OBD2A ECU with 98 Civic LX engine harness repinned for the B18. Check out ff-squad website for all your swap wiring needs. The plug by the oil pan near the crank pulley is the Crank Fluctuation Sensor and OBD2 needs it to run right. The one circled in your pic is the EVAP purge and is for emissions and if I remember right I needed to rewire that, you will also need to rewire your IACV. Again check you ff-squad for wiring.

jdmsir4dr

Thanks for the help..today im going to get the p75 and the 2 wire plug for the iacv and repin the wires at the ecu plug...and do the trick as i seen on ff-squad for the crank sensor...the issue im running into with the evap purge is that on the stock Ls intake manifold is bolted to the manifold on the top .. I have a skunk2 intake manifold and it dont have the hole like the stock one to bolt it up to

nealnanoHX

When I did my Vect head swap on my Ls motor I had the same issue. What I did was relocated the EVAP purge to the fire wall. For you since you have the Skunk2 mani which is setup the same way as a B16 and Type R mani you can just use the stock D series EVAP purge and run a fuel/emissions line from the purge to the intake mani. There should be some vacuum ports on the back of the SK2 mani. This should work just fine if not then remove the D series EVAP purge and relocate the Ls purge to the firewall near the black box/EVAP canister.

luvmyeghatch

i would grab a obd2a clipover and grab a obd-1 p75 and go from there .because that will cut out half of the headache. and also since ur bogging out on (wot)(wide open throttle) id take my throttle body off and clean it up real good as well and put it all back together.