Hey, just got my S4 engine and tranny in to drop into my 1987 TII after the first engine locked up from previous owner.

When going to put my wiring harness on this new engine some of the plugs are just not there and do not match some of the old wiring harness that was left after they cut theirs.

Noticed though that rotaryressurection shows the purple tops to be for an 88 TII so would that also mean some difference in the wiring harness as well?

Also, the injectors from my original setup are different than the ones that came on this new engine.

My old injectors number: 195500-1370 with a tan top.
My new engine injectors: 195500-1370 with a red top (probably purple but faded some) and they are slightly shorter than the old injectors.

So I have different injectors and wiring harnesses that do not really match up. Any help is greatly appreciated.

Thanks,
Mike

 

one of injectors are high impedance, others are low impedance
ECU's are interchangeable, but you have to use right harness with matching injectors

one harness will have plug for injector resistor pack, other harness will not have it.

If you are using harness/injectors with plug for resistor pack, you have to use that resistor pack as well.

 

The "tan" tops used to be purple when brand new - these are low impedence fuel injectors and are "center" keyed.

The red tops are high impedence and are 1988 Turbo II stock fuel injectors.
They are keyed "offset".

If you are just swapping motors, just use your original engine harness and fuel injectors - problem solved.


-Ted

 

i thought all s4 injectors were low impedance ? s4 86-88 i think my injectors should be maxing when im around 180whp on my na

 

87 1/2 and NEWER use high impedence. I'd give the chassis number buy nobody would look anyway.

 

i believe mine are low impedance but im not too sure, the ecu is a na327 the injectors are an orange ish sort of color

part 1350

 

They're low impedence. On the electrical jack on the injector you'll see a locating tab. That tab will be in the center of the jack on a low impedence injector. On a high it will be offset from center of the injector.

 

So, the injectors changed half way through the year?

And would this make a difference between the two wiring harnesses?

If so I am guessing I would need to find that particular wiring harness to make it work. The wiring harnesses are almost the same except the injector plugs are different colors and there are extra wires that my wiring harness does not have.

Thanks for the help guys.

Mike

 

OH. You have two harness? Two different harness? I didn't see that above.

Look at the injector plugs. Hold one harness injector plug in one hand and the other harness injector plug in the other hand. Look at them and you will see a keyway in each. The plug with the keyway centered is for the low resistance injectors, most likely the plugs and injectors from your old engine.

The other injector plug will probably have the injector plug keyway offset from center. That is the high impedence harness.

If you look under the airflow meter/air filter, about a foot down might be a aluminum covered device with a harness going to it. That is the solenoid resistor for a low impedence harness. The low impedence harness will have a connector for that device. The HIGH impedence harness will NOT have a plug for that device.

Also the high impedence harness will have a black/yellow wire at EACH injector plug. The Low impendence harness will NOT have a black/yellow wire at each injector plug. It will have NO black/yellow wire at any of the injector plugs.

Which harness are you going to use? The high or low? And which injectors are you going to use? High or Low?

If I were you, I'd use the original harness in the car with the original injectors. Those harness are different in other ways other than just the solenoid resistor.

 

Yes, I am going back with the tan injectors as they were the original as well as the harness out of the car. Just seems the better way to go.

I will just turn around and sell these other injectors as I don't really need them for anything.

Thanks for the help.

Mike

 

good thing this was brought up. this will be very useful information for me in a month. swapping a 88 TII into a 87 TII. i was thinking about the same thing.

 

i also have two harnesses but all the injectors look the same , in the inside of the clip there is a tab in the center, ont the outside where it clips to its on the bottom right side not in the center, then two on the sides where it clips to

came out of a base model s4 na,