Still acting up

[Cjordan]

Alright guys I've got a couple other threads but now that everything is changed I thought I'd start a new one.

At first with the Carter, the engine would start fine, idle smooth, and rev fast and smooth. Until you drove it, 1st gear was fine but after that you couldn't crowd it in 2nd,3rd or 4th about 1/4 throttle is all you could give it.

Since then I've change
Plugs, wires, cap with brass contacts, and button, and also just added a MC2150.

The jeep doesn't have a tach so I'm not sure what it's idling at, although it sounds low and smooth "not idled up"

I've got the pcv hooked into the big port on the back side, and the vac advance hooked into the small port facing the valve cover.

I checked the timing and its reading 8deg doesn't matter if vac advance is hooked up or not "both ways the same" checking at idle.

When I first installed the carb and fired it up, it backfired through the carb when rev up, and it wasn't running the smoothest, let it run for a few minutes and that seemed to have cleared up.

Now this thing cranks fine, idles ok, but better when I unhook vac advance, almost sounds like a miss when vac adv is hooked up, revs fine, but still won't run right in 2nd,3rd and 4th although it does run better than when the Carter was on it.

What in the world can I be missing, or what can I do to try?

I'm no mechanic by any means, but I have turned wrenches dang near all my life. Mainly tearing apart and putting back together either swapping parts, or waiting on the real mechanic "dad, grandpa, uncle" to fix what ever, then put it back together.

Any and all help would be greatly appreciated.

Ohh I did suck on the vac adv line and block it with my tongue, and the arm stayed open.

 

[Captainlance]

A few questions for you;
1. What is the manifold vacuum at idle?
2. Do you have a valve, or filter inline with the advance? Some engines had a round plastic thing in line.
3. Do you have the electronic computer controlled distributor?
Lance

 

[Cjordan]

A few questions for you;
1. What is the manifold vacuum at idle?
2. Do you have a valve, or filter inline with the advance? Some engines had a round plastic thing in line.
3. Do you have the electronic computer controlled distributor?
Lance

1) not for sure on the manifold vac just yet. I have a vac gauge but haven't checked. Going to of it'll stop raining.

2) hose comes off the vac advance pump "I guess that's what it is" straight to the bottom port of the carb facing the valve cover.

3) just a regular distributor with rotor button, no MSD or any kind of upgrades yet.

The old Carter was completely missing the stepper motor, which I figured was the reason for it running the way it was. I don't understand how it could even run with that big hole pulling vaccum... but it did. Now the new MC2150 doing the same thing, but just a little bit better while driving.

 

[Cjordan]

Well checking the manifold vac is going to have to wait a day or so. Brand new gauge and it came out of the package reading about 2lbs positive pressure instead of set to zero. I tried to get the face off of the gague to set the needle on zero, but haven't had any luck with that either

 

[Cjordan]

Well I think I got it figured out guys. I put my old NGK plugs and that seemed to have made a world of difference. Think I still have a little bit of tuning to do on the carb to get it 100% but as of now it's tolerable.

 

[jdcaples]

When I do a tune up I use a dwell meter with a tach, so I can check the timing at a known RPM.

You might consider picking up a dwell meter with a tach so you can know your RPM at idle.

-Jon