# A question about a manifold vacuum leak? **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** cherokee, jeep\ **Created:** [February 27, 2010, 12:47am UTC](https://community.cartalk.com/t/a-question-about-a-manifold-vacuum-leak/45172 "2010-02-27T00:47:35Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![AstrayM66](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/astraym66/32/5673_2.png) [@AstrayM66](https://community.cartalk.com/u/AstrayM66)\ **Post date:** [February 27, 2010, 12:47am UTC](https://community.cartalk.com/t/a-question-about-a-manifold-vacuum-leak/45172/1 "2010-02-27T00:47:35Z")
on the manifold theres a series of fittings, as seen here: [http://i29…CF0678.jpg](http://i290.photobucket.com/albums/ll241/LatentPixels/DSCF0678.jpg) and here’s the diagram: [http://i29…CF0682.jpg](http://i290.photobucket.com/albums/ll241/LatentPixels/DSCF0682.jpg) i understand that the first fitting isnt used but should there be a cap/plug that should be on there? ---
**Author:** ![missileman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/missileman/32/1366_2.png) [@missileman](https://community.cartalk.com/u/missileman)\ **Post date:** [February 27, 2010, 12:55am UTC](https://community.cartalk.com/t/a-question-about-a-manifold-vacuum-leak/45172/2 "2010-02-27T00:55:14Z")
It should have a rubber cap on it. You are running a little lean without it. ---
**Author:** ![Caddyman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/caddyman/32/23_2.png) [@Caddyman](https://community.cartalk.com/u/Caddyman)\ **Post date:** [February 27, 2010, 1:02am UTC](https://community.cartalk.com/t/a-question-about-a-manifold-vacuum-leak/45172/3 "2010-02-27T01:02:06Z")
Plug that open port. It will certainly upset the idle…But if you were smart enough to post the picture and the diagram, you are smart enough to know that…