scar96

i need to swap the motor in my winter car.
i was thinking of going from d16y7 to d16y8.
The car is auto and i want to keep it like that. i cant seem to find a complete d16y8 auto swap.

so my questions are:

are the engine and tranny mounts same for and auto and manual?
can i use a d16y7 auto transmission with the y8?
is the d16y8 engine wiring harness same for auto and manual?

i know the shafts are different for manual and auto.
ecu is different.

Anything else i need to know.

I cant find a full auto swap so i figure i would piece the parts together. Get a engine from a 5speed car and so on.

chops3266

theres different brackets on the intake manifold and i believe there is and extra sensor on the auto wring harnes that the standard harness doesnt have

zeeman

iTrader: (1)

you can use the d16y7 auto tranny, but make sure to buy an auto engine, it'll save yourself some troubles. Although going from a y7 to y8 will already take some customizing of the wiring (extending wires for sensors to reach their new location).

If you use a 5spd engine, the intake manifold will be different. This is b/c the 5spd y8 engines use a 2-wire IACV mounted on the back of the intake manifold, whereas the automatic engines use a 3-wire EACV mounted on the bottom of the throttle body.

scar96

thanks for the reply eveyone...please keep them coming.

zeeman: the engine i am looking at is from 96-98 el and is 5speed but at the same time i have a complete y8 auto intake sitting at home from a 99-00 si.
as for wiring what if i get the wiring with the engine...would that save me the hassle of customizing?

zeeman

iTrader: (1)

if you get the 96-98 SI auto harness that would save you any hassles....I think, i'm not 100% sure though as I don't deal with automatics very much.

bseries_el

You can use the shafts for y7 to y8. y8 just has the abs gear for the sensor but it doesn't really matter cuz your car doesn't have abs I believe.

so I just save you 100 bucks or more right there!!!

bseries_el

even auto or manual shafts, they're both the same.

scar96

UPDATE
Going to go through swapping to 5spd.
Question:
What is the difference between
1998 1.6 EL
Intake Manifold
ECU

AND

1999 1.6EL
Intake manifold
ECU

Correct me if i am wrong:
OBD2A = 1998
OBD2B = 1999 +

Now would it matter if i used 1998 intake manifold and ecu and put it on 1999 y8 with 1999 y8 engine harness??

3rdgen3

It'll save you a lot of the hassles but not all of them, particularly that the y7 has both o2 sensors AND the wiring harness for both sensors is part of the y7's engine harness in the engine bay (pre and post cat) whereas the y8 only has the PRE-cat harness as part of the engine harness since the stock y8 exhaust has an under-car CAT, the POST cat o2 sensor is part of the floor harness on factory y8 equipped cars...which his y7 car wont have...so he will throw a CEL like i am doing right now on my self y7-y8 swapped car...until he hard wires the 2nd o2 right into the ECU.

3rdgen3

It doesnt matter if its y7 or y8...both could have ABS or not. My factory y7 EJ6 had ABS...its rare but they're out there.

3rdgen3

There's no real difference worth mentioning in the Intake manifold year to year....the major difference is as mentioned before comparing the auto to manual version.

1996-1998 = obd2a
1999-2000 = obd2b

The ECU and the wiring harness pinouts are different.

OBD2a:
-------


OBD2b:
-------

scar96

Thanks that helps....so i need to buy a 99-00 si or EL ecu.
ANY ONE HAS ONE???

3rdgen3

Why? You already have a 98 ECU dont you? If the ECU is from an Acura EL, it should be labelled as 'PBA'.

Personally, if I already had what you have (OBD2a ECU, OBD2b Engine harness) I would just re-pin the harness to match the OBD2a specs. No extra money is involved than..or if you dont feel comfortable doing it than i guess looking for a OBD2b P2P or PBA ECU will work.

BTW here's the exact pins you need to worry about plugging the 2nd O2 sensor into...

OBD2a 2nd 02 Sensor ECU Connector White Wire TO D14 - Sensor Heater 02 Signal (SH02S) Green Wire TO D11 - Sensor Ground 2 (SG2) Black Wire TO A5 - Secondary Heater 02 Control (S02HTC) Black Wire TO A11 - Power Source 1 (1GP1)
OBD2b 2nd 02 Sensor ECU Connector White Wire TO A23 - Sensor Heater 02 Signal (SH02S) Green Wire TO C18 - Sensor Ground 2 (SG2) Black Wire TO A8 - Secondary Heater 02 Control (S02HTC) Black Wire TO B1 - Power Source 1 (1GP1)

3rdgen3

Hold on....is it MINT?

scar96

3rdgen3 the ecu i have are
1999 y8 auto ecu
1996 y7 5spd ecu.

both of which i doubt will work.

the 2 routes i think i can go are
-get a P2P ecu for 5spd 99-00
or
-P28 chipped with OBD2 --> OBD1 conversion harness.

I think getting the right ecu will be cheaper

what other problems can i expect 3rdgen? seems like you did the same thing i am doing.

gavin.p89

As per the intake manifold the 99-00 has air injection holes and the 96-98 head doesn't have air injection. If you use the 99-00 manifold you need to seal the air injection holes.

3rdgen3

Both could be used to start and run the engine temporarily but it wont run well....but since both use the 3-wire IAC it should idle on its own fine.

Which harness do you have right now? Is it for OBD2a or OBD2b? Since you dont have the proper ECU for a 5-speed D16y8, I would than grab an ECU that corresponds to whatever harness you have, it just makes things easier that way.

The P28 chipped ECU is nice because you wont have to run a rear o2 but it will cost more money sine it will require a jumper harness plus those ECU's are fairly expensive. Also if you plan on keeping the car relatively stock, like stock engine, i personally prefer OBD2...

Yea I did the same thing on my own to my own car in August, went from y7 to y8 from an EL. I'm using an OBD2a EL ECU though which is a 'PBA', same thing as a P2P really, except that since its from an EL, it doesnt have a low-octane fuel table. Ever notice how Acura's and even the EL "require" premium fuel, even though the engines are identical? Well theres suttle differences, like the spark plugs on an EL are 1 step colder because of the premium gas and the valve cover says 1.6 SOHC VTEC on it lol.

Anyways, the problems you will run into really depends on what ECU and harness you use. I would highly recommend finding yourself a 5-speed Civic Si/Acura EL engine harness if you dont feel comfortable doing a lot of wiring, but even if you do that you still have to wire in the 2ndary O2 sensor (easy). If you use an auto wiring harness though, you have a lot more to re-wire if you want things to work properly....still pretty easy but its not AS plug-and-play.

scar96

I picked up a p2p ecu obd2b.
Now hopefully that would solve the ecu problem.

The Harness that i have right now is from a 99 el auto so obd2b


What wiring would i have to do? Keep in mind i am doing a auto to manual conversion at the same time.

How would i rewire this O2 sensor in?

So far this is what i have. All is going into ek.
99 y8 engine
96 y7 5 spd tranny
00 si p2p obd2 ecu

99 y8 auto engine harness

considering what i have listed....potential problems?