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Old 1 Week Ago
absok1 absok1 is offline
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Default Saab 99 1973 Vacuum problem when hot

on a 73 saab 99 automatic 2.0 carbureted, i have good vacuum pressure until the car gets fully hot. takes about 20 min of driving, then it loses all pressure at idle. it still has partial pressure over 1500 rpm. I checked all the obvious places for a problem, replaced all the vacuum lines, and i am stumped.
Once its fully hot, i check for any hissing noises, clamped hoses going to brake booster, distributor, no change.
Also, when there is no vacuum pressure, the oil light comes on. does that make sense? Oil level is good. rev the engine a bit and it goes off.
any suggestions? thanks!
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