Nissan primera 1991. Can you help at a idle it revs up and down if you put your ear close to the air filter you can hear a click

fordoverholden, Aug 30, 8:16am
Can you help! At a idle it revs up and down. If you put your ear close to the air filter you can hear a click every 2sec. Any ideas!

andrea_w, Aug 30, 8:20am
Dirty/faulty AAC valve, possibly

fordoverholden, Aug 30, 8:30am
Where do i find that!

andrea_w, Oct 9, 1:18am
What engine does your primera have! Either way, I'm not too sure exactly where it is on the primera (someone on here will be able to tell you though). it will be around the plenum area somewhere.
It will look something like this http://www.rhdjapan.com/media/catalog/product/cache/1/small_image/5e06319eda06f020e43594a9c230972d/0/_/0_24_11.jpg
If that is the cause of your problem, you won't need a new one. they can be cleaned and reused :)