[Ariakas]

Hi all, I'm trying to figure out this noise coming from the engine.

I don't have any error codes, boost comes on strong and stays strong, all vacuum hoses are silicone, vtto inlets, vargas stage 2+ hybrid turbos, csf radiator, vrsf 7" step intercooler, cobb AP protune.

Any ideas or I'm thinking too much... thx.

[Luis561]

Originally Posted by Ariakas

Hi all, I'm trying to figure out this noise coming from the engine.

I don't have any error codes, boost comes on strong and stays strong, all vacuum hoses are silicone, vtto inlets, vargas stage 2+ hybrid turbos, csf radiator, vrsf 7" step intercooler, cobb AP protune.

Any ideas or I'm thinking too much... thx.

I think you're thinking too much. Even the smallest vacuum leak will cause a 30ff and if this is one then it sounds pretty big. move things around, touch hoses, squeeze down on connections, use a flashlight to check dark spots. Spend some time observing it

[Ariakas]

Just an update, this hissing noise was related to a slight crack on the bottom nipple of one vacuum canister. I know there's a bunch of threads about vacuum canister delete or not but I felt best to stick to original setup so picked one up from a parts car and replaced it, all good now.

[Saif2018]

Originally Posted by Ariakas

Just an update, this hissing noise was related to a slight crack on the bottom nipple of one vacuum canister. I know there's a bunch of threads about vacuum canister delete or not but I felt best to stick to original setup so picked one up from a parts car and replaced it, all good now.

Cracks on vacumn canister nipple does happen, previous owner gaffa taped a vacuum line to a cracked nipple on mine, Facepalm. Replaced the lines and cannister.

To add to what Luis561 said, a 30FF code doesn't necessarily show up from a small boost leak, it depends on how severe the leak is.

[Dave92N54]

Originally Posted by Luis561

I think you're thinking too much. Even the smallest vacuum leak will cause a 30ff and if this is one then it sounds pretty big. move things around, touch hoses, squeeze down on connections, use a flashlight to check dark spots. Spend some time observing it

Not true about the vacuum leak and 30FF. To this day i've never had a 30FF and the vacuum pipe that connects to my vacuum pump was leaking vacuum for months before I figured it out. Then I also recently discovered my boost solenoids were leaking as well (down about 1psi at peak). Never once had a 30FF.

30FF triggers when you're down 4psi for ~4s or more. This would require a major vacuum leak, since the only use for vacuum on this car is wastegate control and BOV operation (which doesn't even run off the same source as the boost solenoids, etc.)