Pulling choke out to smooth it out.

I’ve got a 69 CJ5 with a V6 Buick 231, it’s been running and starting great, but here lately, it still starts up good, but I’m having to run it with the choke about ¾ of the way out to get it have good power.

It runs good setting still and revs up without any hesitation, but out on the road it acts and sounds like it missing until I pull the choke out. It does this with a hot or cold engine.

It does a little better after it warms up but I still have to pull the choke out to get it to smooth out under a load.

I added oil to it the other day, and I’ve got about ½ qt to much, I don’t know if that would have anything to do with it or not.

Has anyone run into this before????:?

 

Sounds like an intake leak to me.

Check for tightness of the carb, and manifold.

Also, carb body to base.

Spray some WD40 on all of the gasket areas while idling, if the engine reacts then you have found a leak.

Good luck.

 

i am running into the same problem with having to run the choke out. im in the prosses of changning the dist and goin to rebuild the carb.

 

Could possibly also be a plugged jet in the carb.

 

sounds like its running lean for some reason what your doing by pulling out the choke is cutting off some of the air and creating a better fuel air mix in your motor. yep check for air leaks then plugged jets etc.

 

Guys running with a choke pulled out any after warm up is a good way to ruin a motor. The raw fuel can and does wash the oil off the cylinder walls causing premature wear. Whatever you do don't make this a habit!!

 

We see it happen all the time in the aircooled VW world. Guys jet thier Webers to rich trying to get rid of a flat spot off-idle, and they just end up with more blow-by very early on.

Now, in this case where the choke is being pulled to get it to run "right", then it is not a worry, because it is running the proper a/f ratio, just achieving it the wrong way.

 

Have you changed the fuel filter? Could be running itself out of gas a the higher rpm's.

 

You may think so, I've seen plenty of motorcycle engines ruined this way, oh they still run but with quite a bit less power. This piece of info was even in the owners manual of my last 3 motorcycles when I bought them. Oh and cylinders run with very little oil on them anyway so washing them down is pretty easy.

We'll just agree to disagree on this one!!

 

Yes I've changed out the filter, I thinking of doing a rebuild on the carb. It seem to have started doing this when cold weather got here.

About the WD-40, it idles great after it warms up with the choke in, there's no problem there. It's just when it's under a load going down the highway:driving:, is when I have to run with the choke out.

I'll try a rebuild on the carb and let yall know, if that clears it up..

Thanks for all the ideas...

 

Fuel pump? Can deliver enough fuel and pressure for idle but not for power. Don't forget the small filter at the carb fuel inlet.

 

I had the same problem on my F134. Did not take time to look for a problem till the muffler blew up. It split at the seam. The carb. was lose at the base. I would say look for an air leak.

 

Thanks

 

let me knw if you rebuild the carb and if it makes a change .....i just changed my dist. and im still haveing the same problem you are. im leaning to rebuild the carb too already have the kit.

 

Will do....

 

I'm having the same problem right now with a new solex carb and new pertronix. I'm going to adjust the exhaust valves next, because it has a bit of a miss to it that I can't quite track down

 

Not sure what your problem is (probably carb or a vacuum leak) but I sure wouldn't run it untill you change the oil. You said that the crank case was over full. That extra oil is probably gasoline in the crank case. This will destroy your rod and main bearings if you keep running it that way.

 

Never mind my last post. I reread and realized that you put the extra oil in, it didn't mysteriously appear