2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

How hard is it to put an S5 wiring harness and ECU into an S4?

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Old Aug 13, 2003 | 10:34 PM
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eyeoutthere's Avatar
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From: Owego NY
How hard is it to put an S5 wiring harness and ECU into an S4?

What all needs to be changed. Is it as simple as swapping the driver’s side engine harness and the ECU?

Thanks,
Jason
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Old Aug 13, 2003 | 10:40 PM
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Scott 89t2's Avatar
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the whole dash harness is different and doesn't match up.

either you can take the whole dash and dash harness out and change that to S5 harness as well. or figure out how to splice them together.
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Old Aug 13, 2003 | 10:41 PM
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Nope, it's not that simple at all. I've heard it's a bitch of a job to do. Just search a bit and I am sure it will be covered in depth in other threads.
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Old Aug 13, 2003 | 11:01 PM
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you will need an electic (89-90) Oil Metering pump. You will also need the S5 AFM.

If I where you I'd save some money and get in on the next Microtech LT8 Group buy.

Twice as fast at half the Gas.

Last edited by luiml73; Aug 13, 2003 at 11:03 PM.
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Old Aug 13, 2003 | 11:02 PM
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From: Owego NY
That’s odd. Because I have an S4 Parts car that has an S5 engine in it. It has the S5 harness and computer(s).

But the gauge cluster is from an s4 (7k redline).

Are the gauge clusters interchangeable?
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Old Aug 13, 2003 | 11:14 PM
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From: Owego NY
Originally posted by luiml73
you will need an electic (89-90) Oil Metering pump. You will also need the S5 AFM.
I have all that stuff.

Originally posted by luiml73
If I where you I'd save some money and get in on the next Microtech LT8 Group buy.

Twice as fast at half the Gas.
Whats a Microtech LT8?
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