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Old 03-12-2012, 08:16 PM   #1
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Intake vacuum port?

Ive got a 2000 4.0 On the side of the Intake manifold there are 3 vacuum ports, Today while working on the jeep i noticed there was nothing on the first port (closest th the front of jeep) and it was just sucking air, i looked for a hose that may of come unplugged but found nothing. Does anyone have any idea what goes on there? I bought a rubber cap and capped it off for now.... thx....

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Old 03-12-2012, 09:26 PM   #2
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If this is the one you mean it should be capped.

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Old 03-12-2012, 09:42 PM   #3
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I believe he means this one, one of three in a row.

That would be Capped

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Old 03-12-2012, 10:01 PM   #4
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Quote:
Originally Posted by CoyoteOn2 View Post
I believe he means this one, one of three in a row.

That would be Capped

yep...thats the one....I guess i did the right thing by putting a cap on it...now i wonder how long its been that way...it was sucking in massive amount of air....thanks for the help....
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Old 03-12-2012, 10:09 PM   #5
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Yep, that's the one that should be capped. I believe and correct me if I'm wrong but that port is for automatic transmissions. On mine, I couldn't find why I was having pulsing RPM spikes and throwing an RPM error code until I finally saw that a few months later.
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Old 03-12-2012, 11:32 PM   #6
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Quote:
Originally Posted by burton160w View Post


I believe and correct me if I'm wrong but that port is for automatic transmissions. .

Well ~~~ The Photo I provided is of my 2000 4.0 Automatic, and it for sure is plugged. But I NEVER SAY SOMEONE is Wrong.
After all, Hey~~ What Do I Know?.

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