The following steps all apply to anyone keeping the BBD carburetor. Steps one and two may be skipped by those changing to another type of carburetor or to fuel injection.
Warm up the Jeep long enough for it to be operating in closed loop mode if the ECM is still functional.
Screw in the idle jets so that the needles that are controlled by the stepper motor move. The purpose of this is to fool the ECM into putting the stepper motor driven needles into the full rich position. When this happens, you will see that the needles will be all pushed the way to the inside of the carb and the tone of the air going through the carb will get much lower and the engine will slow down and start to miss. At this point you should shut off the engine and disconnect the plug for the stepper motors on the back of the carb. The plug stays disconnected from now
so i started this you know, dug in cut wires and what not..and found out that my carb was already bypassed. but not the same way. If you look at picture 4 there is a plate covering where the stepper motor used to be. so i am guessing i dont have to worry about the ecm controlling the carb?
No. You don't have to worry about it. Though in your case the bypass is "needed" You computer is trying to get information from stuff and control things that aren't even there...
When I got my YJ it has a carb off of a '72 Dodge (Still the Carter) which I didn't figure out until I was doing the bypass as well. Make sure everything else is hooked up and connected the way it should be according to the bypass instructions. It ended up making a world of difference for my YJ.
"The only true wisdom is in knowing you know nothing."
Also, do not adjust your air fuel fixtures without a wideband o2 sensor so you don't cause more issues by running lean/rich. I know its a crazy thing to have on a jeep, but you can make it so that it is modular and use it for several different vehicles.
Good luck, man! It's super easy once you get everything figured out conceptually. Here's my thread that I started when I started the project out... Sadly, I didn't really get any help with it - but I documented what I did and anything I ran into pretty well so that others with similar carb situations could have some help. Don't know why I JUST thought of it.
I did the By-pass and all was so much better, and then I change the Carb. to one for a late 70s early 80s CJ7 with no stepper motor, bolted right on every thing hooked right up NO MODS no Adapter plates, and runs like New!