FCar2000TA

iTrader: (7)

When I get my new motor, I am also going to be replacing the wire harness from the ECU because, I might as well while the motor is out. Should I get a used F-Body one, or a new one from Painless Performance Products, Wiring Specialities, BP Automotive, Performance System Integration, etc...

The benefit of a used F-Body ECU wire harness is that all of the connections are already there, and the length is correct.

The benefit of a new one is that it is brand new and I can have it made with the LS7 injector connectors, but I would have to add pins/wires for any sensors not included, and I might end up having to coil up some excess wire length.

Inputs?

shakenfake

F-Body one. Personally I would not even change the wire harness. There is literally no reason to.

Now having said that I WOULD go ahead and rewrap it with some threaded wrap instead of factory electrical tape. I would find all the wires that look crappy and resolder some new ones if needed. You are wasting money buying a new one tbh.

LLLosingit

iTrader: (4)

What logic is there to replace a used harness with a used harness? Am I missing part of the story?

shakenfake

There is no logic.

I'd post a smiley face but for some reason it won't let me

FCar2000TA

iTrader: (7)

This is my logic:
- The car has had some electrical oddities lately, mainly pertaining to the IAC valve.
- The current harness is in a 1999 TA that has been in the AZ heat for all 22 of its years. This tends to make wires brittle.
- I will already have the engine/trans out of the car, so this would be the best time to replace the entire wire harness.
- I will only purchase a used harness if the vendor has inspected it and replaced anything that needs to be replaced. I will not buy an as-is used harness.

Basically, I am already going to be in there, so this would be the time to do it.

I am leaning rather heavily toward the Wiring Specialities harness. The come with high temp wrap and can have LS7 injector and MAF connectors so I do not have to have adapters.

shakenfake

You are assuming it is the wiring harness. And what if it isn't the harness? Good job now you are out some money and back to square one.

While I can understand this I would still say inspect your own harness, rewrap it, and then just run it. If you find wires that are looking like they may be no good you can solder new ones in.
Probably the only logical response, but it is almost like saying "I have my wheels off while doing a rotation I might as well go ahead and replace the hub."
This is the worst one yet. You are going to go off a vendor, who mind you you don't know and are placing all your faith in, to say that everything is all good. That is not at all smart.


I'm telling you man you would save a lot of money and effort just rebuilding the harness you have and doing it yourself. If you wanna burn some money then be my guest but I'm going to try and steer you away from that lol

FCar2000TA

iTrader: (7)

I will wait until the engine is out, and see what the wire harness looks like. Maybe I could just redo the wires/pins/connector for the IAC valve.

shakenfake

Yea that is what I would do

Also my nicely laid out message didn't save the quotes fml

fixed it

FCar2000TA

iTrader: (7)

Is there a how-to somewhere for removing the ECU wire harness? Can it be done without cutting wires?

shakenfake

It should just be held in by clips and should not require cutting. I would start by tracing all the wires down and start undoing their frame connections