re: Engine issues on my CJ7 258 i6. Any Carb experts? NEW UPDATE Page 3

I'd pour a can of SeaFoam in the tank and see if that helps. Worked for me. That SeaFoam is pure gold.

I opted for the motorcraft swap. Night and day difference from the Carter. Ebay.

ive never messed with a carter or webber. I've had a MC 2100 before and it's a simple little carb to mess around with.

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I'd pour a can of SeaFoam in the tank and see if that helps. Worked for me. That SeaFoam is pure gold.

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i ran the motor pouring seafoam down the carb, but i guess that isnt helping the jets.

You have insufficient fuel supply. At idle / revving with no load the bowl holds enough fuel in reserve to take up the slack from the fuel pump.
Bad fuel pump / clogged filter / clogged or malfunctioning needle or float in the carb.

Under load, you are depleting that supply and running out of fuel.

Or, you have plenty of fuel and a clean idle circuit, but a dirty high speed circuit.

You said you tried a electric pump, if that did not help I would bet it is internal carb issues.

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or just buy a rebuild on off ebay, 100+

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I did this.

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you have a link to the one you got?

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Let me get home and I'll look. It came with a ton of very detailed info on the install and the tuning.

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thanks i appreciate it.

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This is the guy I bought it from, looks like he might have some.

ehrmannmp

Here's what I bought- description below-

MotorCraft 2100 JEEP Carb Upgrade 258/4.2 Non-Smog 1.08 venturi

auction includes a fresh Motorcraft 2100, 1.08 venturis carburetor. Properly set up for your specific application, jetted to your elevation and modded for your driving style and intended use. The ones pictured in this auction are all prior kits I have sold through EBay, all installed by very happy customers. The one you will receive with a "Buy It Now" bid will be freshly built and ready to roll. It will be media blasted, hot tanked and will look great. I have modified these carburetors to work best with the 258/4.2 in a non-emissions environment.

NOTE: These particular kits are slightly different from my normal one in that they will eliminate ALL emissions components. If you have an E-Test, buy one of my other kits please, as this one will not be for you. This is one of my least expensive kits, but is also one of my best kits for a stock to slightly modified 4.2...... When installed, you will have 1 vacuum line for your PCV to your intake manifold and one vacuum line for your distributor to the carb. That’s it folks!!!

What am I offering?

I am offering the ultimate budget solution to end all headaches of the crappy-arse Carter BBD, 2bbl carb, piece of junk, garbage carbs. This Motorcraft swap will work on all JEEP/AMC/EAGLE/Javelin/etc 258's w/ any 2 bbl carb set up. Even if you have the 232, or a 1bbl intake, I can set one up special for you. This upgrade will improve idle, response, starting, cold starting, acceleration, power and MPG. This carb will not stutter and cut out like the Carters are known for. If you can get fuel to it, it will run at almost any angle. I can build you a carb best for wheelin' or for use as a daily driver, OR both. I would probably not recommend the Non-Smog kit if you are trying to pass an emissions test, though I know of several that have passed through (Including one of my own) If you want to retain the factory air cleaner, no worries, I cover how to adapt your factory air cleaner to the Motorcraft carburetor as well.

I have personally installed 100+ of these and have sold many, many more online just through various BBS's (I have recently surpassed the 10,000 mark on kits sold) It is easy enough for an average person to install with average tools and average knowledge. My included instructions are over 400MB (and growing) and are full of step-by-step instructions complete with digital pictures that will guide you along the way.

I will assist you in any way that I can for however long it takes you to get it done. This is an afternoon project for the average Joe, AND... If you are in the area of Colorado Springs, CO, I will do one better. I will install the carb for you. Details to be worked out on a case by case basis.... Usually runs around $50-$100 and takes a couple of hours.
What is included in the kit?

INCLUDED--Carburetor... Fresh and ready. Carb will be jetted correctly for your elevation and will have the proper power valve configuration for your ride. It WILL be ready to bolt on. (This carb runs 275 CFM , same as my 2150 1.08 version)

INCLUDED--Proper base plate adapter. As you may know, this install requires a difficult to find (or make) adapter. They are out there, but be careful, they are not all the same. I have given up completely on using the Mr. Gasket and Trans-Dapt adapters. They are pot cast pieces of junk and are usually warped and crack easily. I have designed my own adapter. It is C&C milled locally and is precision matched to the mounting hardware and the intake/carb. You will not find a better adapter on the market.

INCLUDED--Proper fitting base gaskets for the install.

INCLUDED--Proper throttle linkage. I offer a bracket that converts the rear pulling Motorcraft carb to a downward pulling carb. Your Carter pulls down and my bracket will utilize your existing, factory linkage (Easiest to install). I also offer a rear pull linkage that converts your Jeep to a rear-pulling throttle. You pick which one you want, and I will build your setup accordingly. IF YOU HAVE AN AUTOMATIC TRANSMISSION YOU WILL NEED THE DOWNWARD PULLING THROTTLE LINKAGE!!!!!!!!!!!!!!!! On some late model CJ's that have power brakes (large brake booster) you will have to use the down pull linkage as well as the brake booster will be in the way. This is not an issue with YJ's.

INCLUDED--All hardware required to mount the new carb and adapter to your intake.

INCLUDED--INSTRUCTIONS INSTRUCTIONS INSTRUCTIONS I have searched long and hard for the best, most common sense information and have compiled very good Word and PDF documents covering everything you should need. I update this almost daily I find new/better solutions or verbiage. I will include the same instructions I use AND I will include my updates and problem work-arounds that I found to be pretty common. (My home # is in there too) These instruction files are HUGE, and yes, easy to follow with step by step instructions and pictures. The instructions are written for the average Joe and when printed, are over 60 pages by themselves. They will take you through the complete process of removing the old carb. all the way through tuning the new one.

INCLUDED--Support. Nothing more to say here. I will support you in any way that I can. I learned my lessons the hard way and with that being said, I don't see any reason why anyone else should have to. I will make this as easy as possible for both of us. I will provide email support and phone support if needed. Heck, bring it to me and I will show you 1st hand.

INCLUDED--Throttle return spring bracket. Pre-built and ready to install.... I just started including this due to popular request from buyers. (See, I listen to your feedback emails)

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I also bought a rebuild kit for 25 bucks but im known to take shite apart and cant get it back together.

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Been there with a carb... if it comes down to rebuilding yourself or installing a new carb, take it back and buy a good carb.