I haven't had a chance yet to play with finding out why my carb-converted '82 isn't passing the smog test, but in the meantime I've noticed something very odd. On hard acceleration, like on a freeway on-ramp with almost-full-throttle to full-throttle acceleration, if my A/C is on blowing out the dash panel vents, air flow direction will temporarily switch to blow exclusively from the floor vents (isn't this the "default" position?). Is this a result of a vaccum leak somewhere? If so, could this be a cause of my emissions test failure?You may well have found the cause of your emissions test failure. The position of the vents is controlled by engine vacuum -- so if the air goes from the dash vents to the floor vents when you hit the gas, there is definitely a vacuum leak.
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