2.5l Vacuum Plug on Throttle Body? Leak? - Jeep Wrangler Forum
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Old 01-10-2010, 10:45 AM   #1
Jeeper
 
Join Date: Jan 2010
Posts: 191
2.5l Vacuum Plug on Throttle Body? Leak?

I just bought my first wrangler, 1999 with the 2.5l engine and a stick. I have a question about an issue and would appreciate any help.

The jeep has 112K on it, so I replaced the water pump and the thermostat since the pump was just starting to leak. I got everything back together and started it and heard a very loud, very large vacuum leak. The source of this is the throttle body (something I didn't touch or get near) and there is a port on the side that has a 90 degree rubber tube on it that looks like a spark plug boot. The bottom of the tube is wide open to the atmosphere and it sucks in a huge amount of vacuum. There are at least three such ports there, this is the upper one. I assumed I had knocked off a vacuum hose that was supposed to go into this boot but I sure can't see one anywhere. If I plug this port the jeep runs fine. There are no codes either.

Was this a factory plug for an unused vacuum port? (For an automatic transmission, maybe?) And maybe the right angle rubber boot used to have a plug in it and that fell out?

I did notice a couple days before I did this work that the idle suddenly went to 3000 rpm and stayed there on a cold start. I shut it off and it was fine after that.

Many thanks in advance.

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