Vacuum leak

2000 JEEP GRAND CHEROKEE
150,000 MILES
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DANNY9273
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I recently took my jeep to o'reillys to see what the check engine light was on for. They told me I had a vacuum leak. When i got home i started looking under the hood, and found a vacuum port that didn't have a hose on it. I looked around for a dangling hose, but didn't find one. Is it possible that there should just be a cap over the hose?

On the diagram under the hood, it shows there being a vacuum port that isn't used, and i do believe that this is the port that im talking about.
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Sep 13, 2011 at 1:15 AM
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JACOBANDNICKOLAS
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Is that a steel line? If so, chances are it isn't a vacuum hose. Can you feel any vacuum at it?
Sep 13, 2011 at 2:21 AM
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DANNY9273
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Yes, it is a steel fitting. It's one of those fittings with like three ridges on it to hold a rubber hose on. There is vacuum on it when I put my finger over it.
Sep 13, 2011 at 2:41 AM
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JACOBANDNICKOLAS
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Plug it with a cap. See if the problem stops. It should.
Sep 13, 2011 at 3:11 AM
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DANNY9273
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Thats what I was thinking, seeing as how i couldnt find a hose hanging around. But with this uncapped as it is, when my car is stopped at a stop sign, it seems to act like it wants to die. But it never does.
Sep 13, 2011 at 3:16 AM
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JACOBANDNICKOLAS
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That is what vacuum leaks do. They lower the intake vacuum; thus, the engine doesn't get the correct amounts of air / fuel. I feel confident once it is plugged, you will see an improvement. Especially if it is a large leak.
Sep 13, 2011 at 3:19 AM