hondalife93

I been having an issue for some weeks now. Been searching adjusting checking. But cant get figured out for nothing. But i have 2000 honda civic ex (D15b Manual). Bought with blown motor(D15b) well i also have a 1998 honda civic ex (D16y8 Auto) well torque converter went bad or something. Idk. Bought like that. Anways. I pulled the motor from the 98 and put on transmission from 2000 then put it in the car. Well.... Let me give ya some details bout car first


Car:2000 Honda Civic Ex
Motor: D16y8 obd2 same head. Motor came from my daily so i know its good. Didnt take anything apart on it
Trans Ecu Harness all from D15b.
obd1 i believe. Correct me if im wrong.
also have jumper harness off d15 distributor and wired to d16y8 distributor. All colors matched up.
intake manifold is off the d15b
Car runs and drives.

But here the issue.
Wont let me connect computer says error everytime try get code.
Car starts really rough and hard shaking the motor&car
check engine light on of course. Lol this my first swap by the way.
It runs really rich you can smell it. Has bluish whitish sometime black smoke from exhaust
It idle really high. Rpm gauge not working so not sure how high my gues tho be 2000-3000 at idle if not more
when drive it if hit gas to hard the car cuts out and misfires.
Car kinda sounds like top fuel dragster at starting line. Thats how its idling.
Im just not sure if im missing something in the wiring. Or if its fuel issue or air issue.
So wonder if someone might have an idea. It be very much appericated. I can anymore info i can. I just wanna get this lined out been waiting for long time for do this. And now im stuck. But i guess thats how the car world works 😂

NVturbo

Ditch both motors and get a complete D16Y8 along with the P2P ecu. That's the easiest route to go and will work (that's if the motor isn't blown of course). No rewiring, no ECU jumper harness....

hondalife93

I have the complete d16y8. All i did was swap intake trying make it run right. But i have all orginal parts to both cars. Nothing i do makes it run smoothly like before. Lol

hondalife93

I have the complete d16y8. All i did was swap intake trying make it run right. But i have all orginal parts to both cars. Nothing i do makes it run smoothly like before. Lol
i might just need different ecu. Instead using d15 ecu

TomCat39

What market is your 2000 Civic Ex, if it's CDM or USDM the D15B is not the original motor or even the right motor. The D16Y8 is the stock motor for a USDM/CDM 2000 Civic EX.

Oh and what D15B motor is in the car? That's another important detail.

hondalife93

You are right. I had feeling this was gonna happen where i live almost all hondas around here have swaps. I was waiting for someone to call it
i thought i was wrong. But thats probley why im having problems. Fml

TomCat39

What D15B is in the car?

Your chassis harness is going to be the OBD2B harness for the complete Y8 you have.

If you have the complete Y8 and ECU it should be plug and play.

Manual transmission doesn't make that much difference on the D series. Either better fuel economy or better performance, both work just fine on either motor. You would have to do the main shaft rotations to differential rotation in reverse gear to determine the ratio.

The problem I think you will face is I think the 98 is OBD2A while the chassis you have is OBD2B

hondalife93

Yeah i have everything for for both y8 and stuff came d15b. Not sure what d15b was in it. kinda had big hole i just got everything off it and junked it spilling oil everywhere. But i used the y8 harness first everything plugged in cept that end plug-in but driver shock tower. And pretty sure its the power to fuel pump and whatever else in back of the car. I think make y8 harness work i had switch wiring harness in the dash by fuse box. Thatd be my guess. Im new at this but i have alot time into also. Aiming for the right way to do it.
y8 harness has 2 plug by strut tower thingy lol if this one would plugged in everything would plugged in perfect
And d15b harness has the one.
and thank you for that. Now i know what i have. Read alot different things hard to determine who to listen to.

TomCat39

Look for 96-00 FSM manual, there are digitized copies floating around on the internet.

It will be your bible for your 2000 Civic EX.

Also google 98 civic ex OBD and see if it's obd2a or obd2b. They have different ECU plugs.

I'm not as familar with 6th gen civics so I'm not sure what year OBD2B was introduced. But I do know there are key differences.

As well I know there is both OBD1 and OBD2 D15B's as there is at least 4 different D15B motors from Japan.

I'm also not familiar with which distributor is for the 2000 Civic Y8.

These are the things you should research to be able to piece your car back together.

If you can think back, did your D15B have a vtec solenoid, 2 solenoids or no solenoid?

hondalife93

had no soleniod im pretty sure. And you are right 98 is a obd2a and 00 is a obd2b. I have both these harness. And from what i read i have to change the dash harness from the 00 to 98 and make the car all obd2a. I could be wrong. I put y8 harness and intake back in the car and im change dash harness and dash and see what happens.

hondalife93

Wiring simply just isnt gonna work. I tried to change wiring harness in the dash. To match the y8 harness and simply does not plug into wiring plugs through the car door. And etc. Due to plugs being different.
The closes i got to making this setup work.
Was y8 harness with d15b dash harness but because the plug i shown above wont plug in by strut tower. Needless to say im screwed cause ive tried everything.