Yesterday morning, in the rain, toward the end of my commute, my '70 B's tach
was running 800-1000 RPM high.
Last night, in virtually identical conditions (Roughly 60 degrees farenheit,
heavy rain, heater/demister on (and making the interior very warm, but dry.)),
it ran as much as 2000 rpm high -- 5000 rpm @ 50 mph.
This morning, with the temperature in the low 40s, and no rain, the tach was
fine until I got in to the parking garage at work, where it showed about 500
rpm too high at idle.
And, when I think about it, I may have seen this once before -- crossing west
Kansas on the interstate July 4th weekend 5-1/2 years ago. 105 in the shade,
blistering sun, and sustained 80 mph.
So I'm guessing now that this is heat-, not rain-, related. Last spring, I put
in an MGOC heater core, motor, and fan, as well as a version of the Bob
Muenchausen's heater valve. http://hometown.aol.com/akamrmg/index.html
That combo makes the heater pretty effective -- but now it seems that, along
with the halogen instrument bulbs, it makes the tach run hot, and show
excessive revs.
What, exactly, is going on with the tach? Is this something that can be fixed?
I don't want to have to go back to cold and darkness...
Matt
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