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OEM Tech Discussion Forum for OEM (Original Equipment) or stock XJs and MJs.

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  #1  
Old September 24th, 2017, 11:46
Rumgod Rumgod is offline
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Need help identifying a vacuum port

Hi, newbie here working on my jeep, it's 2000 XJ, 4.0L, 4x4, 3.5" lift, auto 180,000 miles. I've had it about 3 months and and have gone thru just about all the usual things to create a good baseline, hoses, oils, ignition, fluids, etc.
I had been aggravated with my mileage, the last thing I did was replace the upstream O2 sensor( I left downstream as it was), cleaned MAP and IAC sensors and my city mileage went from 9-11mpg to ~14.5mpg and on a controlled test(full tank of gas) run on a 60mile highway run I went from 14mpg to 21mpg at 65mph on cruise control. I'm happy now.

I do have a question though, I'm a bit of a stickler about "everything in its place" and there is a bolt stuck in the intake manifold that doesn't seem to be OEM, I can't find any pics or references to this 'port' that someone apparently blocked, maybe not stock intake manifold?!.
Can anyone help or identify this? here's a pic I took a while ago.

Thanks! -Art

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Old October 7th, 2017, 08:37
Rumgod Rumgod is offline
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Re: Need help identifying a vacuum port

still no help
Hope someone will see this and have an answer for me
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  #3  
Old October 7th, 2017, 08:58
RCP Phx RCP Phx is offline
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Re: Need help identifying a vacuum port

It's not used on my 2000!
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  #4  
Old October 7th, 2017, 12:07
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Tim_MN Tim_MN is offline
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Re: Need help identifying a vacuum port

The manifold and the port are stock, and that port is always plugged. The stock plugs disintegrate.
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I spent a few hours researching how to jack up an XJ, but even this is more complex than a normal car.
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Old October 7th, 2017, 23:57
Ralph77 Ralph77 is offline
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Re: Need help identifying a vacuum port

It is in use if you have a '00 with CA Emissions. Capped off if you have an '00 with Federal Emissions. Most but not all '00's came with CA Emissions. All '01's are. At least that is my understanding. Go buy something like this just to clean it up if that bugs you. They go right over the nipple on the intake manifold.

https://shop.advanceautoparts.com/p/...E&gclsrc=aw.ds
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Old October 8th, 2017, 19:15
Heavyopp Heavyopp is offline
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Re: Need help identifying a vacuum port

I have a '00 with cali emissions -- I don't think that is capped on mine -- don't know where it goes off the top of my head but I'll check tomorrow and report back
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Old October 9th, 2017, 00:27
Ralph77 Ralph77 is offline
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Re: Need help identifying a vacuum port

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Originally Posted by Heavyopp View Post
I have a '00 with cali emissions -- I don't think that is capped on mine -- don't know where it goes off the top of my head but I'll check tomorrow and report back
It should not be. Goes to the purge solenoid, think that is what it is called, that is in front of the blower motor in the engine compartment.
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