Vacuum nipple?

BENII

MEMBER
2004 FORD EXPLORER
4.0L
6 CYL
4WD
AUTOMATIC
176,000 MILES

Just replaced the four timing chains on this engine. I'm presently hooking up the top/front of engine items. I happened to notice what appears to be a port on the back of the intake next to the AIC/throttle body. Problem is cannot for the life of me find a hose anywhere unless this one had a step down boot on it. I have found a hose (smaller dia) that goes under the cruise control and through the firewall on passenger side. But it's too short also. That's why I'm thinking there's part of it missing. Hope you can help with this. Thanks, Ben

1 Reply

KASEKENNY

MECHANIC
18,907 POSTS

It is hard to picture where this line is but I suspect this is an EVAP line if it is a larger line.

However, it could be the brake booster. Basically we attached the info below on the manifold.

No matter what I would make sure you check for vacuum leaks when you get the engine started.

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

These leaks are the worst to try and figure out so it is better to check even if the engine is running well.

Please run through this and let us know what you find with this.

Thanks

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