986 Forum - The Community for Porsche Boxster & Cayman Owners - View Single Post - Weird off-throttle and mid-throttle noise

wmjosiah · 02-27-2018, 04:57 PM

Hi all,
The mid-throttle noise was definitely from the vent in front of the gas cap - my son and I pinpointed it while driving around with the top down today - Rich XTR called it, though I didn't see this until now. I got a better recording of the noise: http://insanetechnology.com/2018_02_26_17_04_42.mp3
I stuck some wadded-up paper in the vent and the noise is gone. However this noise isn't at idle, just mid-throttle at any RPM, and it goes away if I get on or off throttle. Purge valve, think ye? I wonder if it might take care of the little off-idle squeak which is definitely coming from the intake (I can hear it clearly with the engine cover off) too, recording here: http://insanetechnology.com/2018_02_26_17_09_26.mp3
Thoughts?
Thanks!

02-27-2018, 04:57 PM	#7
wmjosiah Registered User Join Date: Feb 2018 Location: Belchertown, MA Posts: 36	Hi all, The mid-throttle noise was definitely from the vent in front of the gas cap - my son and I pinpointed it while driving around with the top down today - Rich XTR called it, though I didn't see this until now. I got a better recording of the noise: http://insanetechnology.com/2018_02_26_17_04_42.mp3 I stuck some wadded-up paper in the vent and the noise is gone. However this noise isn't at idle, just mid-throttle at any RPM, and it goes away if I get on or off throttle. Purge valve, think ye? I wonder if it might take care of the little off-idle squeak which is definitely coming from the intake (I can hear it clearly with the engine cover off) too, recording here: http://insanetechnology.com/2018_02_26_17_09_26.mp3 Thoughts? Thanks! __________________ '01 Boxster S '08 Mazdaspeed 3 '04 SV650 '96 K2500 Diesel 5-speed with DB2/4900 conversion