Wiring from ignition coil to DME

[plasgar]

Today I found out my 88 911 had a bad experience under its prior owner. It looks like they upgraded the rear sway bar mounts and whoever welded them in burnt into the wiring harness on the driver's side that runs by the mount. They burnt into the green wire that runs from the #1 pin on the DME harness to the 1 post on the ignition coil. Other than radio installs I have not spliced into car wiring. Couple of questions:
1. What is the difficulty level of replacing the wire by changing it out at the DME harness pin?
2. Is it even possible to pull a new wire through the old harness bundle?
3. Should I cut and splice into the wire prior to it going through the body under the passenger seat and just run new wire back to the coil from there? Zip tie new wire on outside of old harness all the way back?
4. What is the best way to splice them together? I've done a little soldering (again radio wiring)?

Anything else I should be thinking about? Thanks for any advice

[salayc]

1. Difficult, but not impossible. It requires a special tool to remove the wire from the connector.
2. I don't think you have a chance.
3. That's not a bad idea, but if the wire is burned at the sway bar, that might be a better place.
4. You will get a lot of options on this.... I solder and heat shrink.
Why not just repair the wires at the burned point and then heat shrink or wrap or sleeve them with hi temp insulation? If you can post a picture of the damage, you may get some better advice.

[FrankM_]

I would only replace a short section where the problem is and leave the rest as-is?
Solder and heat shrink, then tape around the full loom ?


Sent from my iPhone using Tapatalk

[mo-mon]

Sorry to hear this. I'd do the above but also start looking for a wire harness from a dismantler. Another option is to PM Timmy2 or Sal Carceller (our DME & electrical gurus) if they make the wire harness & then you'd have a brand new one. There's also a gentleman in Europe that makes them.

[plasgar]

[plasgar]

I'm slowly chasing down my problems with starts, idle and some power loss during acceleration. If I don't start it for a couple days it takes 3 or four attempts of the starter running for 5-10 sec at a time before it will start and during the times it doesn't start it tries to turn over after I let go of the key. I can hear the fuel pump and battery is good. Once it does start I have to hold RPMs at 2K or over or it will drop to 500 and die until it is warmed up. Once I start driving after it sat for a couple days I have had it stutter during accelerations and back fire when I let off the accelerator. I am guessing that the wire is not the only problem. So far I've replaced all fuel lines, alternator, fuel filter, checked ground points.

[salayc]

Pretty tough spot.
I think you will want to disconnect the harness at one or both ends and pull it free to give yourself a bit more working room. You're going to have to cut that outer insulation to assess.