my enginne wiring harness has become way too heat soaked and the the wires are starting to show through the insulation. I plan on ordering one next week how do I trade them out? has anyone done this?

Take off all the Biznitch harnesses off of the ECU and pull the biznitch out to the engine bay. Take all the other harnesses and plugs plugged in to the Biznitch. You might have to take things off so you could see all the Biznitch wires. Don't forget the Biznitch tranny harness. Its part of the Biznitch.



go look at the service manual on the Biznitch. Or open your hood and see how the Biznitch is ran. With some common sense and patience, you could replace the Biznitch.

yeah you gotta a LOT of fun headed YOUR way with this job https://www.nopistons.com/forums/pub...#>/biggrin.gif

you gotta remove everything on top the engine. https://www.nopistons.com/forums/pub...IR#>/bigok.gif

plan on having your fd down for at LEast a weekend.

and DONT FORGET to order the new gaskets you need ! https://www.nopistons.com/forums/pub...IR#>/boink.gif

Agree...



its not an easy task....

Its almost worth it to just replace everything while your at it..



My advice, Just fix the exposing wires you could see and replace it when you replace your engine.

I see how the harness is ran through the enine bay what I want to know is how to pull the whole thing out. do I pull the ABS system to get to where it is ran through the firewall. also do I have to pull apart the dash to reach the other connectors on the interior or can get to the connectors simply under the passenger side?

If you see how it runs thru the engine area, its just as easy to see how its connects to the ECU. If you are not willing to get dirty a little to see, I recommend don't try to change the harness.



Just as I stated before, you have to follow the harness and see how its connected.. If you want to see how its ran, go look at the electrical diagram for the FD. It shows how the wires are ran.

you can get to it without dash removal..

as far as the abs. you can clear the harness with some finess without having to remove..

you might want to lossen up the abs shield to get some clearance..

watch out for the ac lines if you still have it as they bend easily..

thanks for that peice of info amp. I got the harness off of the motor already now I just have to get the interior area.

Wow that was quick....

yea It was a lot easier than I thought It would be but go figure with a single turbo setup.

What did I tell ya, With some common sense, its not much too it.

I agree its not too hard its just my friend pulled this diagram of off all-data online and It looked like it went way far into the body he didn't realize that it was the body harness so thats what really freaked me out. is the body harness a lot harder to change? I'm not going to change it as it has given me no problems so far but I just wondered.

I'll throw this out FWIW....

If you don't have the money for a NEW harness, and you weren't having problems with your old one, an option to consider is re-wrapping everything with silcone fusion tape. IIRC the stuff I've got is good up to 450 F. It's relatively expensive...~$5 for a 12 ft. roll, and depending on your harness, you'll probably need quite a few rolls. But it's still alot cheaper than a new harness. I emphasize that this might be an option only if your NOT having problems, the harness and connectors are still basically intact, but just the insulation is crusty.

BTW, you can wrap plugs in it too, to protect them a bit from heat exposure. If/when you need to unplug them, just cut the tape away and re-wrap when your done.

THANKS! I will definetly look into that stuff I would try it on my old one, but it is (A) already removed (B)so heat soaked that the wires and connectors nearly break when I so much as breath on them. it was just a problem waiting to happen. I appreciate the info though I will use that on my new on if its as good as you say it is.

Signal 2, Can you post where you bought that tape? And any specs on the tape itself. I think that would help out a lot.

There are different brand names but the one I've been using is "GB" or GARDNER BENDER. I buy it at a MENARD'S and they carry it in the electrical section. I've also found it under a different brand name at HOME DEPOT but it was clear, which would look like butt under the hood.

GB is ~$4.50 for a role of 10 or 12 feet. If your not familiar with it, while they call it "tape" there is NO adhesives used. It is a one inch wide strip of black silicone that only looks like "tape". It's backed by mylar... because once you remove the mylar and wrap it around something, it immediately sticks to itself. Then over the next few hours, it "fuses" to itself forming a permanent seal. GB says their stuff "insulates to 15,000 Volts and is "weather resistant from -85 F. (-65 C.) to 500 F. (260 C.).

It takes a little practice if you've never used it. I usually cut off just a few inches at a time, remove the mylar and go once around whatever I'm wrapping, sticking it to itself. THEN I begin to overlap. On the typical wire loom I overlap about half of the width (1/2 inch) for each time around and it will stretch a little, and "form fit" around stuff like plug sockets etc. The reason I only use a few inches at a time is because once you take the mylar off, if it flops around it will stick to itself and is a minor PITA. Still, you can get really good at in no time. Makes for a very neat wrap. As I understand it (like so many other things) this stuff was developed it for the military. I've been told by some jet mechanics that they've been using it for a number of years.

Batteries are dead in my camera right now. I'll see if I can get some pictures up later.

Re did my harness today..... I had it wrapped upped again before( the old harness)but the weakness and damage was all ready done (1992).I also sanded all grounding points to insure clean contact.

http://img209.imageshack.us/img209/5...diumbg7.th.jpg

http://img213.imageshack.us/img213/7...diumdk4.th.jpg

Picture of my temp sender (in the TB coolant line). Sorry for the focus, but I think you can still see how it forms nice to the shape of the underlying bolt head fitting.

http://img214.imageshack.us/img214/3...diumsi6.th.jpg

Couple more plugs that I wrapped after the old stuff was toast. I also covered the root of the plug, where the wire enters to keep any moisture out. The original tape job didn't/couldn't do that.

http://img208.imageshack.us/img208/8...diumhe3.th.jpg

Relocated IAT.

Thanks Jim!



Looks good!



PHIL

http://www.mcmaster.com/nav/enter.asp?sesn...&catnum=112

Here is another source, just search under "self fusing tape". Longer rolls and a choice of tapered or straight.

Jim, Once again, thank you. I have to redo my harness and I'm going to use this instead of using shrink wraps.. Much easier to handle.