Quote:
Originally Posted by 300DFarmer
Brian,
Thanks for your reply. I discovered a small vacuum leak in the connecteor between the surge damper and the VCV. When I corrected that I was able to read about 5" of vacuum available to the modulator. However, the vacuum does not diminish at all when I apply the throttle ( either while parked or driving). The only time that the vacuum diminishes is while shifting into park or reverse. Also, Adjusting the VCV has no effect at all on the amount of vacuum available to the modulator. Seems to me like the VCV is the culprit here. Any ideas how to test it, or if it is repairable.
Thanks again,
Ray
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If the VCV only provides 5" of vaccum and doesn't modulate the vacuum as the rack is opened, then it's failed.
But, what confused me is the fact that you don't have excessively harsh shifts, which would be a characteristic of low vacuum.
It's possible that the combination of modulator pressure (relatively low) and vacuum (very low) results in an acceptable shift pattern, but, this would be quite unique and the long term ramifications of such a setup are unknown.