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dump valve makes hissing sound


Active Member
Nov 23, 2013
When driving along at 60 to 70 mph I've noticed I can hear like a hissing sound coming from the dump valve sounds like a leak can anyone help


Active Member
May 15, 2014
To say it's coming directly from the dump valve is probably not the right approach. Unless you have super ears!

Cover all the joints in fairy liquid. Get it up to the speed it makes noise. Pull over and look for bubbles.


Boost it or lose it!!
Mar 16, 2014
South Wales
After I put an open cone on my LC I noticed a hissing when pressing the throttle but thought that was it the induction kit sucking in air
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