Originally Posted by bernm8r
I am a recent Jeep wrangler owner (1990 Sahara 4.2) it has 135k miles and was sitting for a few years after the owner died. I recently gave it a tune up with your basic oem parts like plugs, wires and ignition coil. I also replaced the gummed up Carter bbd with a rebuilt one from advance auto. thinking that would solve my problem of poor idling. Well it did solve that but once I got it on the road the hills here in upstate NY were killing me. absolutly no power. I took it to a mechanic buddy of mine that tweaked the carb asmuch as he could but still would bog down. I know this is a common problem with this oem carb. This forum suggests getting either a weber carb or the mc2100 I am leaning to the mc 2100 but would like input from real jeep owners not a sales pitch from a website. also what else would I need to complete the conversion. would I HAVE to get the HEI and higher voltage system? This is to be a daily driver with some moderete to occasional off road at least for now. I just want it much more reliable than it is now. Thanks in advance for any helpful hints or suggestions
I have the 88 YJ with 258CID motor. Bought it with 155,000 miles. It was boggy from the day I bought it. I elected the HEI and the MC 2100. My experience has been so-so with the conversion. It ran great here in AZ at 6600 ft elevation for a year, then I started having trouble with the HEI. Burned up 3 ignition modules in a couple of months. Am considering the MSD 6 Offroad module. Also discovered the real problem with the MC 2100 is they are shipped with .47 or .49 jets. Am converting to .42's to lean it out at my altitude.
No matter what you do you are not going to get more than 15-16 MPG. Check out the options by googling (258 CID HEI conversion) and (MC2100 swap) Do a lot of reading before you do anything else.