Mechanics

VACUUM LEAK

2000 Jeep Grand Cherokee • 150,000 miles

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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Danny9273
September 13, 2011.



Is that a steel line? If so, chances are it isn't a vacuum hose. Can you feel any vacuum at it?

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.

Tiny
Danny9273
Sep 13, 2011.
Plug it with a cap. See if the problem stops. It should.

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.

Tiny
Danny9273
Sep 13, 2011.
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.