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Old 07-10-2009, 08:56 AM
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Operation of Vacuum Switch for TCC Lockup

Another thread has discussed my attempts to incorporate a vacuum delay valve before the vacuum switch in my TCC lockup controls.

Without a delay valve, the switch activates and locks up the TCC. But with the delay switch in the line the vacuum switch does not activate.

I have traced the problem to the fact the vacuum switch does not hold vacuum. It bleeds off vacuum about as fast as the vacuum delay valve allows vacumm through. As a result the vacuum switch is only holding 2" of vacuum while the ported vacuum is pulling 13-15" at constant 45 mph with the delay valve in the line.

Maybe the vacuum switch is designed to have a slight delay of its own. Does anyone know if the vacuum switch is supposed to bleed off vacuum or is mine faulty?


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Old 07-10-2009, 11:23 PM
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I'm leaning towards faulty switch. How could a switch with a 'set' vacuum rating be accurate if it had a leak?

There are electronic delays available. For some green of course.

Last edited by C-10; 07-10-2009 at 11:51 PM. Reason: 'of'
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