986 Forum - The Community for Porsche Boxster & Cayman Owners - View Single Post - still have a whistle/hum after regen valve

mipstien · 03-07-2016, 05:46 AM

I have the dreaded whistle from the evap system coming from the fuel fill area. I replaced the fuel vent and the regen valve but at speeds that are cruising with a constant rpm the hum comes on. does not do it during accel or coasting. It also seems to be doing it at nearly any rpm. 2k-4k common to be stuck at for any amount of time while driving and it will start to hum. It never does it at idle and it isn't nearly as annoying as it was before I replaced the regen valve.

There are no cel codes coming up and not even a possible fault showing up. everything is clean. The car is running currently better than it ever has, minus the embarrassing noise it makes from that area.

I don't want to just bandaid this sound I would prefer to figure it out.

03-07-2016, 05:46 AM	#1
mipstien Side Porsche Join Date: Jan 2015 Location: Tn Posts: 157	still have a whistle/hum after regen valve I have the dreaded whistle from the evap system coming from the fuel fill area. I replaced the fuel vent and the regen valve but at speeds that are cruising with a constant rpm the hum comes on. does not do it during accel or coasting. It also seems to be doing it at nearly any rpm. 2k-4k common to be stuck at for any amount of time while driving and it will start to hum. It never does it at idle and it isn't nearly as annoying as it was before I replaced the regen valve. There are no cel codes coming up and not even a possible fault showing up. everything is clean. The car is running currently better than it ever has, minus the embarrassing noise it makes from that area. I don't want to just bandaid this sound I would prefer to figure it out. Last edited by mipstien; 03-07-2016 at 05:52 AM.