Possible Vacuum Leak?

[KJL]

I have a 1995 that runs strong. I noticed the other day when the hood was open that after I turn the car off I heard a hissing sound for a few seconds coming from under the intake (of course....). I don’t recall ever hearing that before. The car doesn’t seem to do it if I start it only for a minute then turn it off. Running the ignition on with engine off vacuum pump test indicates no issues with at least that part of the vacuum system.

[lfalzarano]

How’s the antifreeze fluid level in the overflow tank?


Sent from my iPhone using ZR-1 Net Registry (http://r.tapatalk.com/byo?rid=90383)

[KJL]

How’s the antifreeze fluid level in the overflow tank?


Sent from my iPhone using ZR-1 Net Registry (http://r.tapatalk.com/byo?rid=90383)

Good.i realize there are many vacuum lines under there and it could be any of them. I will try and localize using sound and get my bore scope in there to look around. If I have to remove that plenum again, I am locking the secondaries open getting the chip updated and pulling out that rats nest of plastic tubing and hoses. They really should have used hard lines for some of that.