There is no way a carb is more efficient than efi. A carb just dumps a metered amount of fuel in depending on jet size. Efi uses several sensors and such for the injectors to spray the proper amount of fuel in. Plus when offroading you don't have to worry about off camber situations and starving the engine for fuel. With efi you will always have the proper amount of fuel. People think fuel injection is so complicated. It really is not. Carbs to me can be so hard to get to run right. With efi the computer does the tuning.
I know there are guys on both side of the fence, and I don't want to start a flame war either.
My grandpa is old school with the 750 double pumpers he had on his z28. He also thinks we should go carb since then we could later put a cam in and just reject instead of messing with the computer. Also in the time saved not doing the wiring and possible down time if I wire it incorrectly.
This is currently my DD but won't be once I go to boot camp.
Good choice on a Motor I just installed a 5.2 from a grand cherokee with unkown miles and unknown condition, so I did a cylinder leak down test (best way to confirm its good) on it and the worst cylinder only had 15% leak which is really good so I slapped it in. Sure I've had a few wiring snaffoo's with my swap and a few sensor headaches but it still beats the piss out of that stuipid carb setup I had on the ol 4.2. Besides all of the wiring really isn't all that bad sure it takes a little bit of knwledge of reading schematics and what not but anybody can do it if they set their mind to it. I went into my swap with no understanding of the wiring, but with great help and encouragment from this forum I have been able to figure out everyone of my problems and now I got a fuel injected jeep that runs like a raped ape!
Dont listen to the naysayers stick with the MPI and you will be happy with the increased fuel mileage and performance it brings ya I will gladly help you with any of the wiring issues you might run into, now with that said your system is OBDII and I am OBD1. Which wiring wise I dont think is all that different other that you have one extra O2 sensor than I do. wiring into my jeep was simple once i undertood how it all worked. It really only needed like five wires to run. then it was a matter of hooking up gauges as long as you label everything when you remove the old motor it will be simple. I do recomend getting a good service manual for the vehicle your motor came out of and start studying those schematics. Good luck brotha!! and welcome to the club
Nice motor, I've got the same one in my rig. Mine's a 96 that was originally OBDII, but I converted it to OBDI with just a few parts swapped out. Good luck with your swap, it'll all be worth it in the end!
Fuel injection has so many advantages over carbureted that you'd be an imbecile to go back to a carb on a FI engine. Your 'guy' may be old school, but that particular engine is not. I'm not 100% familiar with the ignition systems on that engine, but I'd imagine swapping to a carb means replacing the dizzy and a few other components just to get it to work right. Stay with the times, don't go back to the stone (carb) age
Stick with it. OBDII is a bit more complicated, but only because there is more to it. Time is all it will take, and a little trial and error. In the end, you will have a more reliable engine setup.
FI is a dynamic system. It is always changing A/F mixtures so that the engine runs at an optimal efficiency range, regardless of altitude, air temperature, incline, etc. All of which can bring a carb setup to its knees.
And much like Xpress said, just stick with FI. These are Magnum engines, not the old LA 318 and 360 engines. It wouldn't make much sense to reverse engineer a fuel injected engine back to its older brethren that Chrysler has since moved on from.
Personally, I'd rather deal with the wiring and electronics headache for a week at most while doing the swap, than deal with a lifetime of dickin' around with a carburetor every few days.
1991 YJ, bone stock. Starting all over again with another YJ...