Possible Vacuum Leak? - ZR-1 Net Registry Forums

KJL · 09-25-2019

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 · 09-25-2019

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

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KJL · 09-26-2019

Quote:

Originally Posted by lfalzarano

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

Sent from my iPhone using ZR-1 Net Registry

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.

09-25-2019	#1
KJL Join Date: Mar 2013 Location: Roswell, GA Posts: 234	Possible Vacuum Leak? 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. __________________ 1995 ZR1 #159 Ported,Corsa,4.10 Rear, Dual Disc RAM Clutch, Alum Flywheel, Haibeck Chip, ZFDoc Plates, Relocated Battery 400 rwhp 1992 ZR1 #280 Ported, Locked Secondary's, Flowmaster Exhaust, Haibeck Chip, 375rwhp 1996 Collectors LT4 (Stock) 1972 Convertible 434 Small Block 572 rwhp

09-25-2019	#2
lfalzarano Join Date: Feb 2011 Location: Clayton, North Carolina Posts: 1,133	Re: Possible Vacuum Leak? How’s the antifreeze fluid level in the overflow tank? Sent from my iPhone using ZR-1 Net Registry __________________ Lou[COLOR="Red"][B][SIZE="4"][/SIZE][/B][/COLOR]