Re: [AMC-List] Weird non-running issue on '82 Jeep CJ

[Nick Lenarz <n9viw@xxxxxxxxx>]

Thanks to all for the replies, I appreciate it.
Ken Siroonian: It's currently running a BBD because it works, but the
carb I was having problems with was a Motorcraft MC2100 with a 1.08"
bore. Many CJ owners have claimed this carb to be the best thing since
sliced bread, but if mine is any indication, sliced bread ain't that
good anymore! LOL!
As for the stepper motor, to heck with that! I JB Welded the ports shut
when I had the carb apart for cleaning, and I made a block-off cover
from a piece of 1/8" plate steel to cover up where the stepper went.
Looks good from here! :D
Tom Jennings: From looking at the exploded diagram in the rebuild kits
I bought, the carb is only missing external bits- dashpot, Idle Control
solenoid, stuff like that. All the internals- power valve, accelerator
pump, jets, float, float needle and seat, venturi cluster (with the air
redirector plate), all that stuff is still in there. All the gaskets
are new.
Ken Ames: I don't know, all I know is there was a "16" stamped on one
side of the power valve, and it's the one that came with the rebuild
kit for the carb. Could be less and the stamp means nothing, but
there's really no way to know unless I could either pull vacuum on the
valve, or find some sort of documentation from the rebuild
manufacturer. Either way, not a huge concern, as it should be selected
for average drivability anyway.
As for the MC2100, I drilled the idle tubes to .032", like the Carter
tip I mentioned before. It did seem to help a bit, but it still wanted
to die just off-idle and when trying to accelerate- just fell on its
face. As soon as I let off the gas a bit in either of these
circumstances, it ran better. So, if it's doing that, is that too rich,
or too lean?
In a rare fit of daring and bravery, I drove the Jeep to work today.
What a great feeling, to be behind the wheel of my old Jeep again! :D
:D :D The BBD did well, but there's still an off-idle stumble that I
can't figure out. If I hold the RPMs up and feather the clutch from a
stop, there's no problem, but I'm only masking the issue by doing that.
I think there's still some sort of vacuum problem, in that there's not
enough to get past that sudden dropoff when the throttle opens, and the
carb stops feeding fuel. These engines are supposed to pull 18-23 inHg
of vacuum at idle, and mine can only muster up about 14-16 inHg.
There's also a wicked snapping from the exhaust on acceleration, sounds
like I've got a hole in my headpipe, but it's not there while coasting
or cruising. I think I'm going to get a new set of manifold gaskets and
just pull both manifolds off, clean them, and put them back on with
fresh, just to make sure.



 
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