Ok so I have a 99 ex sedan with a factory y8 five speed. Motor was blown bought a y7. I’m putting the y8 intake manifold on the y7. I’ve completed this. I used the y7 injectors, y8 fuel rail, y7 throttle body w/ y8 throttle rotor. The y7 throttle body has the three wire iacv. Y7 was a complete swap but po cut the harness plugs off when removing from the donor car. I’m using my 99 y8 harness with a 99 y7 ecu. I forgot to plug the injector air holes first time and I could physically hear the vacuum leak. So plugged those up. Getting ready to put y8 intake manifolds back on car. I’m using the y7 ecu because it was all I had. My main problem now and I’ve searched. Maybe not good enough but I can’t find a thread that totally matches mine. I need to convert my obd2b y8 two wire plug to the three wire obd2 y7 iacv. All I find are the 96-98 threads. I believe the motor was a 96-98 y7 because the distributor plugs were different. Although every other plug plugged into something. I put my 99 dizzy on. The y8 ecu barely ran the car. It would scoot up real high in rpm then deep down and bog out. Y7 ecu runs car but with idle surge that makes it sound camed. I need the diagram to convert my two wire obd2b from my factory 99 ex harness on my factory 99 y8 intake manifold since I’m using auto ecu where do I pin or move wires to?
any help would be appreciated got it in and got out running but with idle Steve it runs so bad.

 

Double post... this is a Forum "Faux Pas". Ask a MOD to merge so all answers are in the same post thread. I answered in your other thread. The key information that you failed to provide is the YEAR of the replacement Y7 engine that you are trying to use. Also, if you use a '99-00 Y7 engine harness, the IACV wiring will be done at the ECU end. A manual Y7 engine harness will have the same number of ECU plugs on it as your current Y8 engine harness... and there will be one more plug on an automatic Y7 engine harness over your current engine harness.

 

well I’m a little lost on what year the y7 was. All my plugs from my 99 y8 harness plugged into everything on the y7 except the distributor which leads me to believe it’s a 96-98 y7. I have a 99 y7 ecu which I believe to be auto since it’s got the extra plug hole with pins in it whereas my 99 y8 ecu that same hole is blank. I have a y7 harness that was hooked to the motor but po cut the ends instead of unplugging them. My main concern is with this iac on the y7 throttle body I used because it’s three wire but since I’m using the y8 manifold that came with the car and the harness that is original to the car I can still plug in my y8 two wire IACV. It seemed that most guy’s doing this used a 96-98 y7 and harness and motor. So can I just use the y8 original IACV since I’m still using factory harness instead of going through all the IACV stuff.