I have a 1997 civic ek coupe with a d15y7 non vtec engine I plan on swapping that out real soon and replacing it with a b20b engine can I use the stock harness to the car and if so what exactly has to be done or changed ?!?!

 

First off is the B20B, is it USDM, what ECU, and if so does it come with a wiring harness?

If its a USDM B20B:
-use the engine harness it comes with and the B20B or OBD2 B18B USDM ECU
-wire up the secondary 02 to the ECU

If its a JDM B20B using a USDM ECU:
-use your engine harness with the following modifications - 3 to 2 wire IACV conversion, extend secondary 02, either convert your IAT plug to round style or place your factory IAT into your intake arm, bypass CKF (crank fluctuation sensor)

If its a JDM B20B using a JDM OBD2 ECU:
-use your engine harness with the following modifications - 3 to 2 wire IACV conversion, either convert your IAT plug to round style or place your factory IAT into your intake arm (this ECU will however not connect to an OBD2 emissions scanner if your state has those)

 

Sounds great how do I convert the 3 wire iacv to a 2 wire ?!?!

And I will be using a obd1 p28 with a obd2 to obd1 jumper harness

And what about alternator distribtor etc ??

 

The forum has a FAQs sticky (see link in my signature). Read threads there to answer most of your questions.

 

 

okay so i have a 97 civic i believe is obd2a. it has a d15y7 in it non vtec. i plan on swaping that engine out tomarrow and putting in a jdm b20b i know i can use my same harness that comes with the car, but what will i have to change or splice wires on ? alternator distribtor injectors IACV ? i know how to preform the iacv 3 to 2 wire change. anything else ? god i wish it was plug and play ! ?!?!?!?!?!?!?!?

 

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