ok, just need one more definitive answer before i get the harness i need for my swap. here are the facts:

motor is a b18b it is an OBD2 motor, JDM
car is a 92 civic Si
i am going to be running OBD1


so, my question is simple:

is it possible to just use an OBD2 LS harness and not have to do ANY plug splicing? i mean wont it just plug right into an obd1 ecu if the connectors from my shock towers are OBD1?

or MUST i use an OBD1 harness and solder on OBD2 injector clips, alternator, and distributor clips?




i've been a bit fuzzy on this since i first ordered my motor. thanks for the help!

 

bump. anyone?

 

Yes, it is possible to use an OBD2 LS harness. It will be 100% plug and play.

 

as stated above, it is plug and play. sorry, was thinking of obd2 civic harness'. completely different when it comes to the firewall.

 

why would i need a jumper harness? if the obd2 LS harness plugs right into the shock towers, then the underdash wiring is still OBD1 style ecu connectors anyway, right?

 

you wont need a jumper harness if your using an obd1 ecu.

 

No need for a jumper harness, The obd2 LS engine harness is 100% plug and play to the shock towers.
You are correct the underdash harness remains untouched and intact.

 

thats what i thought, just wanted some clarity. thanks!

 

Just FYI, you mentioned you are running an OBD2 JDM engine and engine harness... The JDM harness is not compatible with a USDM chassis harness.

 

x2 You can run a OBD1 LS ECU too I believe or chipped P28 is a popular choice.

 

no no, i dont have a harness yet which is why i posted this thread. i know the RHD harness wont work though so dont worry lol.

just needed to see if running the OBD2 harness is easier and it definitely is.

 

just get an obd1 harness and get obd1 injectors and obd1 alternator then it will be plug and play.. you will also need to change the distributor to an obd1 but a cheaper alternative would be to purchase a plugnplay kit for the distributor that will plug into the obd2 distributor and the other end will plug into the obd1 wiring harness.. i believe it cost like 20 bucks

and as far as your ecu harness your fine just use an obd1 ecu..