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Peloquin 07-27-2010 01:59 PM

Carb and sputtering questions/issues

Got a question for you mechanical types (yes yes, i'm working on that inclination in myself).

I have a 1990 6cl 5sp, it has the stock 2bl carb on it. since I purchased the jeep about 4 or 5 years back, i've replaced a number of things on it:
plugs, wires, o2, pgr, alternator, trans, clutch, rear main, battery, cat, muffler, exhaust manifold, fuel filter. i'm down to the last few things under the hood to replace. i've got my eye on replacing the dist, cap/rotor and coil next, as well as possibly the carb.

Here's what it's doing. Just got the trans working again. i've noticed recently, right before my trans issue, that the engine sputters a bit unless i am steadily accelerating in the lower gears. this is instantly noticeable in the first 3 gears if you back off of the gas for a second. even if you are in a gear, at neighborhood speeds. lets say i'm in 3rd running about 35 mph. this would normally be a perfectly fine speed/rpm combo for this gear. lately, when doing this, it sputters, making me speed up. so now it's time to shift into 4th, or coast in neutral if going downhill or upcoming stop. so i get into 4th, and in the lower end and middle of the gear, same thing. it's not until i get into 5th, and keep it over 60 that this stops. now, if i let of the gas at all, even at that speed, it'll sputter a little. like it's having problems breathing or something.

i'm assuming the carb probably needs to be rebuilt, at the very least, or replaced. now, I don't give a crap about swapping out the motor for a V8, or putting in the military grade carb that will let me drive through 18 feet of water with 25% more hp than the stock. i just want the thing to run, i don't need it modified. so my question is, does this sound like a vacuum issue in the carb? will replacing it be better than rebuilding the one i have? i saw some rebuild kits, but they specified that they do not include the stepper motor and vacuum cylinder. i found the stepper motor in an exploded view. not sure where or what the vacuum cylinder is, if i have one, if it is needed, all that.

i need some direction. anyone have any ideas?

tlrrob1000 07-28-2010 01:16 AM

Hey Peloquin. Get your rebuild kit and knock that out, only 25.00. Welding tip cleaners are a great thing to have when you do this. Punch every jet, orfice and tube. Biggest problem is that they get dirty. Once you do the rebuild and get it running check your timing. Then you can move on to replacing your vacuum lines later. Start your air/fuel mixture screws at 2 1/2 out also.

Peloquin 08-10-2010 09:24 AM

i'll give that a try. still haven't had the time/ money to get on this project. i'm thinking I might try the cap/rotor and coil first, just to ensure i'm not doing something that doesn't need to be done. then if i'm still getting the same symptoms, on to more money.

Just-Jimmy 08-10-2010 10:09 AM

Sounds more like a Carb problem than cap and rotor. The original carbs are crap. Get a Weber. I know you do not care about a horsepower increase, but do you care about a fuel economy and reliability increase? If so, do not waste your time rebuilding the stock carb.

Brooklin Cheetah 08-10-2010 10:43 AM

You should look into a 'nutter bypass' (google it) and a carb swap with either a weber, or the motorcraft 2100 carb.

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