2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.
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Old 11-20-11, 07:38 PM
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More what are these???

In the first picture you can see where the wiring harness goes in through the firewall, my question is that the only place where the harness comes through the dash? Or does the harness run all throughout the dash?



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Old 11-20-11, 09:03 PM
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That's the engine harness, and it only goes through at that point. There are about 5 connectors inside the cabin right by that spot you need to disconnect to remove it. I don't remember the exact number of connectors, but if you've never done it before they're a pain in the *** to find, unless you have eyes like a snail.

And no, it doesn't run all up through the dash, it only goes in enough to connect to the ECU.
Old 11-20-11, 09:57 PM
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Ok thanks, yea i have never done this before. What are the wires underneath the steering wheel?
Old 11-20-11, 10:25 PM
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explain what you are trying to do,and someone may be able to help you or prevent you from doing something!.
Wires under the steering wheel stem from the fuse box on the inside driver's upper left kick panel area,and go all over.(inside the dash to outside the car on the left through the firewall).
Old 11-21-11, 10:58 AM
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I am doing a S4 TII swap into my N/A S4, does anyone know all the wiring i would need? Do i just need the TII wiring harness and ecu? Also can i use the N/A TPS with the turbo 2 motor?
Old 11-22-11, 09:02 AM
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There are literally hundreds of posts on this exact topic, but I'll give you the brief rundown. The rest you can search.

Use the NA harness, extend wires as necessary to reach each sensor's new location. Use the TII ECU, and all the TII sensors that come on the engine, as well as the AFM and boost sensor.

Turbo Swap FAQ
Old 11-22-11, 09:10 AM
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The owner before me cut the wiring cause cause he was doing a v8 swap, I also am having trouble figuring out what that black cylinder is in the picture, does anyone know?
Old 11-22-11, 09:43 AM
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i believe we should set up some sort of pay by chat service for more in depth assistance. cut wires... good luck. download the factory service manual and start looking at diagrams until you understand them is my best advice, or befriend someone who is good with wiring.
Old 11-22-11, 05:29 PM
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