I am having a problem with my 2015 Volvo s60 2.0 E-drive making this sound either at a stop while idling or driving down the road at any speeds. Sometimes at a red light or a stop sign the car idles rough almost to the point of stalling but has never stalled, shifting into neutral seems to help.
I have installed new plugs, new gas cap, new MAF and cleaned the throttle body (On the car with cleaner). No codes!
I did install a new Fram air filter a while back
Anybody have any ideas?
Here is a link to the sound:

 

Stupid me if would have just opened the gas tank door I would have found that the sound is coming from the gas cap (It's a new one) venting pressure out. Now is there a valve that may not be working or is the carbon filter or vent line plugged. I can blow out the vent line with compressed air, but I have no way of knowing if there is a vent valve that is not working properly. If any one can help me with where is the carbon filter? 2015.5 Volvo S60 2.0 T5 E-drive.
And maybe any testing methods or tricks.

Thanks

 

what happens if you put the old gas cap on? did you go with an aftermarket or genuine volvo replacement? I'd be really suprised if the vent or filter is plugged on a 3 year old car. IMHO, its more likely the cap is wrong.

 

The new one I bought I'd OEM from Volvo.
I agree too new to be plugged I would think also