Probably a simple fix...?

[Anonymous]

Ok, here's the history....

Car would run fine for awhile, then hot or cold and randomly, while running or idle, would start shaking and shuttering while giving it gas.
Turns out the EGR Valve pipe was leaking bad. So I bypassed it. Neighbor took it too his shop, plugged the valve, and we plugged the manifold. Replaced all the vacuum lines and now everything is air tight.

Here's the problem...

Now its getting too much fuel. Opened the air/fuel mixture screw way open and still nothing. It will run for awhile, then it will you can feel and hear a random miss that gets worse for abit then it stalls out. It restarts right away, but you can definately smell the gas. Replaced fuel filter, the old metal fuel line, carb was replaced 3 months ago so doubt the float could have gotten out of wack that soon, new plugs, cap, wires about month and half ago.

Plugs are gap'd at .040 now, think i'm gonna raise that to .54 like fordsix has listed in his duraspark conversion tech pages. more fuel = more gap?

The occasional, random miss with everything engine wise checked, is also leaning me towards replaceing the duraspark 2 module. After regapping tonight, next step is replacing the ignition stuff.

Any ideas?

Car is 69 Mustang coupe
77 Granada 250 4.6 L I6
Duraspark 2 igntion
Carter YF 1bbl carb

 

[CobraSix]

If you opened the idle/mix all the way, you are providing more fuel.

Turn it all the way closed, then back it out 2 complete turns. That will give you a good starting point. After that, either with a tach or by ear, turn it clockwise (closing it) until the RPMs drop. Then go back counter clock until the RPMs go back up, usually 1/4-1/2 turn. That should get you going.

Slade

 

[Anonymous]

well, beyond that mix up hehe its still doing it after changing the gaps.

Misted some water and looks like my problem is something in the wiring from the duraspark 2 harness somewhere. Gonna see about getting whole new setup/harness tomorrow.

 

[CobraSix]

How old is your cap and rotor? Also, how old are the wires. Caps and rotors have to be replaced every so often, and the usual sign is a slight misfire every now and then, but not usually dieing.

Also, if you are running DS2 with a stock coil and GM module, keep your gap closer to original of .035. The .056 number is for DS2 with hotter coil and MSD ignition. Even with a hotter coil, I wouldn't go beyond .042 with DS2.

I think your problem may lie elsewhere.

Slade