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beast14
Guest
my reading for vacuum fluctuates between 12 and 18............is this normal........if not where should the reading be.............i've got an autometer manual gauge
See - you can never stop learning. Always wondered why the vac increased as the car warmed up..... now I can regurgitate that answer on demand and sound like I know something :lol:When its cold there's an air valve that opens to let the engine idle faster - as it warms up this valve closes so the engine has to suck air past the (almost) closed throttle butterflies creating a higher vacuum at idle.