Sputtering engine when accelerating

[musciab]

76 CJ5 AMC 258 i6 / 4.2l I6 – Starting my rig can be a little bit of a bear in the am. PO put a manual choke on it because he said that the vacuum assisted choke didn’t work and wouldn’t allow it to run. So when starting I pump my peddle a few times pull the choke and it usually starts up after a few cranks and I immediately have to push the choke back in or else it will stall. Not a big problem.

My real issue is a bad idle when cool/cold out when first starting and until things warm up. Still not the biggest issue but none the less, still a problem when Im headed to work early in the cold winter morning especially when at a stop sign. Saw a write up about clogged idle tubes and will try and get to that sometime soon. The other real issue is when accelerating when everything is still cold or cool. It feels as if something is bogging down and there will be some sputtering. This happens in all 3 gears. 1st gear it takes hitting 2 stop signs to go away, second gear about the same but 3rd gear it will happen most of my drive until I hit a higher RPM. Anyone have ideas on what this could be. Buddy of mine said it could be my intake and/or my exhaust manifold gasket leaking. Just wondering if anyone else had a similar issue or a fix for this. Thanks.

 

[Fastatv]

76 CJ5 AMC 258 i6 / 4.2l I6 – Starting my rig can be a little bit of a bear in the am. PO put a manual choke on it because he said that the vacuum assisted choke didn’t work and wouldn’t allow it to run. So when starting I pump my peddle a few times pull the choke and it usually starts up after a few cranks and I immediately have to push the choke back in or else it will stall. Not a big problem.

My real issue is a bad idle when cool/cold out when first starting and until things warm up. Still not the biggest issue but none the less, still a problem when Im headed to work early in the cold winter morning especially when at a stop sign. Saw a write up about clogged idle tubes and will try and get to that sometime soon. The other real issue is when accelerating when everything is still cold or cool. It feels as if something is bogging down and there will be some sputtering. This happens in all 3 gears. 1st gear it takes hitting 2 stop signs to go away, second gear about the same but 3rd gear it will happen most of my drive until I hit a higher RPM. Anyone have ideas on what this could be. Buddy of mine said it could be my intake and/or my exhaust manifold gasket leaking. Just wondering if anyone else had a similar issue or a fix for this. Thanks.

Well, on a cold morning, running with no choke at all, I would think that its a little lean. After the engine warms up, it requires less fuel, and runs much better. Couple things. Have you tried to run it with just a little choke in the mornings....I had my son move my manual choke knob while I was under the hood, observing how much the choke was being pulled in as he moved the knob. If you pull the choke all the way out, u may be completely closing the choke plate, which would mean that even cold, ur getting too much fuel...not enough air to mix. There has to be a given gap btwn the choke plate and airhorn or too rich of mixture occurs. Anyway, long story short, u might want to experiment with the choke cable...maybe pull it out a quarter...see how that does, if that doesn't work, next time its cold, pull it out half way. Took me a while to figure mine out. I pull it out about a third of the way, and one pump...starts and idles and I have to leave the choke knob in that position for a few minutes...while driving. After the engines warms up a little, I push the knob in. Hope this may help.........Fastatv

 

[jasonmark1993]

If it just started happening recently and this is your first year with the jeep, id guess its the cold weather. Carbd vehicles will do this when its cold, and it'll last longer if certain components arent in place. A simple but effective item is the flexible tube from the exhaust manifold to the aircleaner.

Does the jeep idle a little higher when it is choked in the morning? Is the stumble just off idle?

I agree with above, don't think of the choke as off or on. You should need to have it partially choked when you drive the first few minutes.