GM TBI on Jeep 4.0 Engine in AMC Eagle

[Baskinator]

BTW, halfway down this page is how I would wire the Duraspark:
http://tc.wagoneer.org/2012/08/gm-tb...on-wiring.html

[blue68deville]

That link looks like the way I wired mine, except I have pin C going to the trigger of the 6A, same wire you would use with points. Then the box powers & fires the coil.

I haven't had any problems with water, but the caddy is more of a fair weather ride. The 7-pin module looks fairly well sealed, I've seen some TBI distributors that were pretty damp and still running.

Have you checked into a TBI/TPI conversion dist for the 4.0? I swear I've seen them. That would be easy, and no playing with rotor phasing when you lock out the duraspark either.

No ECU will be happy with the timing not hooked up.

You will probably want an older ECU like a 1227747, no trans control. The newer ones don't like having no trans input/output signals, but that can be tuned out.

You can repin the harness you have to work with the older ECUs, and trim off the locator lugs on the plugs to plug into the older style module. That's what I did, my TBI and harness is a 93 and the ECU is a 7747.

I'm sure someone on here has done this conversion and will have more info. I've only done 2 conversions, a Chevy 454 and the Caddy.

[Baskinator]

Is it possible to tune the chips without burning/erasing them?

[blue68deville]

Check the vendor section, there's a few folks that provide tuning services based on what your setup is.
You can also do your own, it's not that hard. Especially if you have a vendor set you up with a starter chip.