"DeVere W" <email@example.com> wrote in message
> Fuel pump was no help. Same thing, almost in the same place every
> time.Went a little longer this time. Started acting up right at the
> bottom of a hill before my house.
> The module is a Big A. I assume it has been replaced. Engine was rebuilt
> about 55k ago. Haven't checked the coil yet. Cold out.
> I did notice something a little odd that I've seen a couple of times.
> First, under the air cleaner cover and around the top of the carb there
> is a creamy, milky looking slime. Not much, but enough to notice. I
> don't know carbs so I don't know if this is normal. Also it's spitting
> out black water from the tail pipe. Pretty good stain on the snow.
> I don't know much about vacuum lines so that might be left for a
> mechanic. The previous owners had just took it on a road trip from
> Kansas to Montana and back so I'm guessing this problem is just starting
> or has something to do with cold.
> Guess i'm going to have to call a shop next week if I can't figure it
> Thanks again.
Your carb might be icing up. This is common when it is cold and damp. I'm
not sure if your engine has the plate underneath the carb that has coolant
flowing through it, but it if does, make sure that the coolant is actually
getting to the carb plate. Also, make sure that your thermostat is working
properly. If the engine isn't warming the coolant sufficiently, this could
cause the icing problem too. It would also explain why your oil is milky. If
the engine isn't warming up enough to remove the condensation from the oil
and crankcase, you can get the milky oil condition.
If you can, take the truck out on another run and drive it until it acts up
again, then pull over, shut off the engine, and remove the air cleaner right
away. You may actually see a frost like substance down in the venturis. Also
make sure that all the intake air tubes are hooked up, especially the one
for the heater tube that goes from the exhaust manifold to the air intake.
Make sure the heat riser valve is functioning on the air cleaner as well.
Here is a little reading for you about carb icing:
Also, if you google for carburetor icing, you will get a lot more reading
material. It is especially common in the piston aircraft engines. You can
also get this problem with a throttle body, but they are usually heated as
well right from the factory.