|07-16-2011 12:37 AM|
|hotshotjus||sorry to revamp an old thread but I'm interested in how this all turned out. I just installed my motorcraft carb and whereas it ran good for a few weeks I'm having trouble with idle now. wants to bog down when load is applied, and sometimes I am forced to shift to neutral (automatic) when stopping. any help?|
|03-05-2010 10:13 PM|
what altitude are you at or just tell me where you live and i can tell you what jet to buy.
and if you did not use a heat spacer gasket that can be a problem.
and is your 2100 a 108 or a 121 ( it should be stamped on the side of the carb.)
|03-04-2010 12:18 PM|
|bwilburn||I have a 2100 on a 89 with 4.2L I do not have a regulator. About the jetting no idea I bought mine from some guy on ebay, installed and some fuel adjustments and its running fine. good luck|
|03-13-2009 05:36 AM|
I was planning on going manual choke for simplicity and the fact the electric choke is not working. It is hooked to a 12v power source but does not open as the engine warms up.
I just ordered some #47 jets and a few float, I plan to mess around with the jeep some tomorrow. I haven't bought a regulator yet, from what I can see some people run them and others don't. I guess I'll try again without it and see if I can dial it in before I run out and buy one.
|03-12-2009 03:32 PM|
|mikebigh||why dont you wanna use the electric choke?|
|03-12-2009 03:29 PM|
|03-09-2009 07:51 AM|
|03-04-2009 11:50 AM|
Motorcraft 2100 carb help
I am in the process of a carb swap from the Carter to a MC2100, after installing the MC2100 it fired right up and the weather was in the low 30's outside, way better than what the Carter would do. At first I had a vacuum leak and couldn't get the idle down. I corrected the plate/carb stack-up with fresh homemade gaskets, now it would idle down to about 800 or so but idling rough. I found a leak in the choke diaphragm set-up which I then plugged, it was idling better but not great. I have an HEI ignition set-up and have yet to throw a timing light on it. I will update the post with that info once I adjust the float height and replace the Power valve. It needs some tweaking before its trail or road ready, a few questions for the experts...
1. During the tuning process I had a backfire through the carb and blew out my power valve, a 8.5 hg was included with my rebuild kit, should I replace that one or go slightly lower? I know there is a calculation I've run across out there but I have yet to hook a vacuum gage to it while it's running. I installed a spectra power valve saver to prevent this in the future.
2. What do you guys suggest for the float height from the top of the flange? Right now i have it set "dry" to about 1/4".
3. For the short while I had it running it seems to be really rich, my current jets are 49s I plan to pick-up some 46s or 47s, does that sound about right?
4. I have a manual choke kit for it that I plan to swap in, is there a hole under the base plate of the carb I need to plug? Is it also safe to remove the choke pull down diaphragm if I am going with a manual set-up?
5. I checked my fuel pressure going into the carb, the stock pump has it about 7psi. Is this too much? I've read the MC2100s like 4-5psi, should a regulator be installed to lower the pressure?