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Notice as well, that -typically, these type devices MAY ALSO have a Dash Pot function. That is, this unit may really also be a “Shock Absorber” and may have a calibrated leak inside that allows air pressure escape at a specific rate. I do not know that for sure---but, during the “Malaise era” of smog control during the 80’s- it was not unusual to have a “Tapered rate” throttle closure device that took a high intake manifold pressure ( Like during heavy deceleration where the vacuum would peek as over 20” HG—and suck in way too much fuel from the idle circuit due to high vacuum under the throttle‘s butterfly valve-- - and allow the throttle to close more slowly---to avoid a high amount of suction and excessive rich mixture – basically high HC unused fuel out the tail pipe--- and sometimes also to avoid backfiring.Does anyone know if there should be a calibrated leak in a 67 dashpot? I thought all it did was to just back off idle at higher vacuum, but his write-up made me question.
Calibrated Vacuum leaks are tricky- specifically when also having a vacuum source as does this one. Do your research and verify that it is bad, and exactly what it is supposed to do—and let me know. It MAY be OK as is????
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