At wits end!

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03JeepJeep

03JeepJeep

It's a hoot!
Joined
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Hello all

I've got a 72 318, when I got the car it would run ok but never great but I figured it would be an easy fix. It will start up fine, hit the key it will fire. If you slowly push in the accelerator she will go just fine. If you try to push the pedal in fast or goose it she will die. Same thing happens when coming around a turn and you try go.

I've changed the fuel filter, checked the points, check the plugs, changed plug wires, rebuilt the carb and went through for vacuum leaks. Today I was going to try and advance the distributor but as I started the engine and let it run a bit smoke started coming off/under the exhaust manifolds. I'm pretty confused now, hopefully someone has some insight.

Stock 318, carter 2 barrel carb.

Thanks
 
Advancing timing is good ,, but your accelerator pump likely isn't working, or not working well..

Engine off, look down the throat of carb and observe the shot of gas that occurs when you open the throttle.,, ANY,, ANY delay in that squirter, is your hesitation..

Adjust the linkage that activates the pump till you get squirt the INSTANT you move the throttle.. hope it helps
 
inertia said:
Advancing timing is good ,, but your accelerator pump likely isn't working, or not working well..

Engine off, look down the throat of carb and observe the shot of gas that occurs when you open the throttle.,, ANY,, ANY delay in that squirter, is your hesitation..

Adjust the linkage that activates the pump till you get squirt the INSTANT you move the throttle.. hope it helps
Click to expand...

Thanks for the reply, I tried it and no delay. It was a really good thought though
 
Manually close the choke blade a little and see if it revs better. If it does you have a fuel problem or vacuum leak.
 
Volume:pull the Line to the carb.Insert line,into a can or jar. Crank 30 seconds,look for a pint. If not enough,check pressure with a pressure/vac guage.
 
i was just having the same problem with the 273 in my satellite, but if you
punched mine to the floor it would backfire out of the carb and would only do it
with the choke off and have no power. i just advanced the timing a little bit and
my problem went away. also i should mention i did it by ear. try the timing could
help you a lot.
 
I agree with Abody - check fuel pressure/volume. Then timing
 
Timing -vacuum leak likely. You shouldn't have to guess at the advance. Do you have a timing light? I sometimes wad a rag and hold it over the carb throat. It should die. If not, it's sucking air elsewhere. Then you need to track it down. Whatever you spray around to find the leak, make sure it is not flammable. Ask me how I know.
 
I have a timing light....just having a problems finding the factory timing marks. Ill check the fuel volume/pressure when I get a chance
 
Fuel volume is fine.

Trying to do timing. Right now it's set at 6/7 BTDC, I believe. I guess I'm not sure which 10 is BTDC
 
put a vacuum gauge on it using manifold vacuum port on carb or direct from the intake.

site for some info: http://www.gregsengine.com/using-a-vacuum-gauge.html

look at this chart and it might help diagnose the problem:
vacuum.jpg
 
If the car is sitting in park will it rev ok, or will it bog down a little even in park?
What does your tail pipe look like? Dark soot? If you are in park and rev it several times do you have a patch of soot on the ground?
C
 
clhyer said:
If the car is sitting in park will it rev ok, or will it bog down a little even in park?
What does your tail pipe look like? Dark soot? If you are in park and rev it several times do you have a patch of soot on the ground?
C
Click to expand...

It revs fine, no soot comes out but the the edges of the pipes are black
 
3404speed, thanks for that info! I am going to check this out on my motor just for learning.
C
 
03JeepJeep said:
I have a timing light....just having a problems finding the factory timing marks. Ill check the fuel volume/pressure when I get a chance
Click to expand...

I like to paint the timing marks on the timing cover and damper with white paint or white out, so I can see them better. Make sure you do this with the engine off.
 
When you set the timing, make sure no vacuum is going to the distributor. I'd pull & plug the line to make sure.

While you can use more timing then 6/7 BTDC, a stock teen should still not do what your describing even at that setting. It really sounds like a lean issue......Like was mentioned above, even though you did the rebuild, it still sounds like a low float setting, accelerator pump issue, or a vacuum leak.
 
My wild and crazy guess.. Its a stock Carter 2 brl.
2 little rods dangling near the center of the carb. One or both got bent or otherwise not aligned to the hole below them.
 
RedFish said:
My wild and crazy guess.. Its a stock Carter 2 brl.
2 little rods dangling near the center of the carb. One or both got bent or otherwise not aligned to the hole below them.
Click to expand...
or one of the tubes fell out of the upper part of the carb...
 
bad440 said:
or one of the tubes fell out of the upper part of the carb...
Click to expand...

Yeah the aren't all the same. For the venture bleed tubes to fall out of a Rodchester quadrajet was a very common problem. Open the throttle slowly works ok but open it quick and it acts just like no accelerator pump ( blah before varoom ).
Same result from faulted metering rods in many Carter carbs.
 
After talking to interia more he convinced me to go back out and check the accelerator pump again. Here is a small video of it
[ame]http://i1118.photobucket.com/albums/k616/moose340/3FF870A4-2D2B-4435-BC21-E1ABA97E8C83-19710-0000154620431D17_zpseac2f958.mp4[/ame]
 
That don't look so good. But remember, every time the throttle is opened, it drain the fuel bowl. with out the eng running (Mechanical pump right?) its not getting refilled.

sure don't look like it doing its job though.
 
That particular Holley 2bl was known to have accelerator issues. In the 70's I worked at a shop where we had the county contract to work on Sheriffs cars and support cars. So i have worked on many of these. Cudafever is right when he mentioned the fact that everytime you cycle the throttle, you are draining the fuel bowl. This is what I suggest. Start the car up and let the fuel bowl fill up, SHUT THE CAR OFF and proceed to look down the carb again. But don't pop the throtle open, move it through its cycle slowly. Gas should squirt with a smooth constant flow. If it doesn't( which I suspect it won't) You need to rebuild the carb. and look at the pump linkage to make sure it is moving the pump from the very start of the throttle being opened.
 
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