1999 jeep grand cherokee 4.0 vacuum hose diagram

If someone can please post pictures of intake vacuum lines and where they go that would be helpful!
Hvac not needed it works just fine same with cruise.
Thanks so much!

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just a wild guess, is this for a 2004?

Yes lol soory

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If someone can please post pictures of intake vacuum lines and where they go that would be helpful!
Hvac not needed it works just fine same with cruise.
Thanks so much!

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Engine or passenger compartment (HVAC)?

Engine or passenger compartment (HVAC)?

Engine driver side

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Engine driver side

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A quick glance through the FSM didn't yield many good diagrams, so these snaps are from my '04 4.0.

What's the issue with vacuum lines? Cruise control not working?

I quick glance through the FSM didn't yield many good pics, so these are from my '04 4.0.

What's the issue with vacuum lines? Cruise control not working?

Jeep will idle high about 950 randomly and map sensor from is being sporadic sometimes idling at 15inhg but other times only idling at 10 or 9inhg so figured I would start there and noticed some of the lines were old and very loose

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Jeep will idle high about 950 randomly and map sensor from is being sporadic sometimes idling at 15inhg but other times only idling at 10 or 9inhg so figured I would start there and noticed some of the lines were old and very loose

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Much of the vacuum connections on the drivers side are for the EVAP/Purge system:

Much of the vacuum connections on the drivers side are for the EVAP/Purge system:

But some of it ties into the intake manifold and if there was a leak would that not affect map sensor reading?

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Jeep will idle high about 950 randomly and map sensor from is being sporadic sometimes idling at 15inhg but other times only idling at 10 or 9inhg so figured I would start there and noticed some of the lines were old and very loose

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Any codes, mileage, freeze frame data? Are you getting a good 5v reference at the MAP, and is the signal back to the PCM between .5v and 4.5v?

But some of it ties into the intake manifold and if there was a leak would that not affect map sensor reading?

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It may. I'd smoke the lines or replace the ones that are clearly rotten.

Any codes, mileage, freeze frame data? Are you getting a good 5v reference at the MAP, and is the signal back to the PCM between .5v and 4.5v?

No codes have never gotten this jeep to throw codes.
I will look into how to check that
162k

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If you open the hood and look up at the front edge of the hood there should be a sticker which shows the vacuum lines, spark plug info, etc. Here's the one from my 4.7L.

I'll double check but I don't think mine has that unfortunately

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Any codes, mileage, freeze frame data? Are you getting a good 5v reference at the MAP, and is the signal back to the PCM between .5v and 4.5v?

Idle vs 2000 rpm

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Just thought I'd mention on my 04 4.7 they moved most of the emissions controls back behind the rear driver's side wheel well cover. I didn't think they'd have a LDP (leak detection pump) with Fed emissions but they do and the 04 4.0 may be the same.

Point is if you have a leak in one of the vacuum lines back there where the vapor canister is which ties into the purge solenoid on the driver's side engine compartment inner fender it can affect the way the engine idles or runs. Know that for a fact since it's a favorite place for demon rodents to chew those hoses back there behind the bumper here in the woods. Good luck.

Is it absolutely necessary to disconnect the power while replacing an evap valve? I'm trying to get my drive cycle complete in order to get it smogged. If I disconnect the power, I will have to start over, and it's already been a long, drawn out process, due to unexpected circumstances. If that is a the case, and suggestions on an alternative, to eliminate any power conflicts?

Oh wow, I think I just made have found the reason for the issues i m having, and that comes from the comment about rodents chewing. My heels has sat off and on for quite some time, and I found signs of a little visitor just before I started getting evap codes. . . Thanks Uni! I think you may have, once again, shed some light on this puzzle!

Oh wow, I think I just made have found the reason for the issues i m having, and that comes from the comment about rodents chewing. My Jeep has sat, off and on for quite some time, and I found signs of a little visitor just before I started getting evap codes. . . Thanks Uni! I think you may have, once again, shed some light on this puzzle!

Glad to help Heartfulaluv and you'll have to tell us where you found the evap leak or post a photo? Unfortunately in living in the woods for 40+ years I'm quite familiar with Jeep or vehicle rodent/critter damage.