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Vacuum readings: Cold VS. Hot

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INEEDAGN

Seen Your Member
Joined
Feb 28, 2003
Messages
4,784
I noticed the other day that my car holds a couple more inches of vacuum when it is hot vs. when I first start it up. 14-15 when cold and 16-17 when hot. I saw it on my vac/boost gauge in the car and then verified with a new snap-on vac gauge at the TB. Is this normal for most engines due to ring seal, cold fueling, etc., or should I look for a vac leak that is sealing itself or maybe incorrect fueling/timing issue? Car has an itty bitty cam and the blms are steady. It's running the best it ever has with the extender setup, but it's always idled rougher than my liking, at any temp. I've always figured it's just the way these engines are, but maybe this has something to do with it?

TIA
bob
 
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