Hissing sound under load, Chevy 350. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Leviticus · 03-06-2010, 07:08 PM

Hey,

So I just started getting a hissing type sound when the truck is under load, and you get on it. I don't hear it when I drive it normal, but like when getting on the freeway, it sounds like it is sucking air somewhere.

Not sure if it is just the normal sound of the air cleaner sucking more air or if I have a vacuum leak somewhere, I didn't notice it before. I have checked the upper vacuum connections, brake booster, distributor line, PCV, modulator (Upper connection) etc and all seem to be tight.

Where to look next?

Thanks Guys.

03-06-2010, 07:08 PM	#1
Leviticus Shake and Bake! Join Date: Feb 2010 Location: Central Coast, CA Posts: 609	Hissing sound under load, Chevy 350. Hey, So I just started getting a hissing type sound when the truck is under load, and you get on it. I don't hear it when I drive it normal, but like when getting on the freeway, it sounds like it is sucking air somewhere. Not sure if it is just the normal sound of the air cleaner sucking more air or if I have a vacuum leak somewhere, I didn't notice it before. I have checked the upper vacuum connections, brake booster, distributor line, PCV, modulator (Upper connection) etc and all seem to be tight. Where to look next? Thanks Guys. __________________ "All tyranny needs to gain a foothold is for people of good conscience to remain silent." Thomas Jefferson "You are remembered for the rules you break." General Douglas MacArthur "Support Our Troops And The NRA"



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