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Go Back JeepForum.com > Models > Jeep Grand Cherokee & Commander Forums > ZJ Grand Cherokee Forum > vacuum leak?

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Unread 02-18-2013, 05:03 PM   #1
funkness
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1998 ZJ 
 
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vacuum leak?

so i am getting really close to actually driving my jeep after 2 years of waiting and fixing and spending lol soo checking for vacuum leaks can't find any but yes there's always a but at this spot there is no suction from the hose going to the front of the jeep does this mean there's a leak?

20130218_173635.jpg  
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Unread 02-18-2013, 08:16 PM   #2
ZeeJay1997
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Quote:
Originally Posted by funkness View Post
there is no suction from the hose going to the front of the jeep does this mean there's a leak?
It probably means someone has bypassed the evap canister

Is there another line coming off the purge solenoid that is blocked off?
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Unread 02-18-2013, 08:32 PM   #3
ZeeJay1997
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After further review, plug that line up to the boot on the purge solenoid.
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Unread 02-18-2013, 08:39 PM   #4
funkness
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I took it off is there posta be suction at that hose?
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Unread 02-18-2013, 08:55 PM   #5
ZeeJay1997
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When the purge solenoid cycles, there should be vacuum there, When it's running, the purge solenoid should click after you've been cruising for a while.
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Unread 02-19-2013, 04:08 AM   #6
funkness
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So there is suction from the side that has the purge solenoid but not from the other side?
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Unread 02-19-2013, 04:19 AM   #7
ZeeJay1997
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vacuum is created by the intake manifold. the purge solenoid meters it to pull fuel vapors out of the tank towards the engine through the canister.
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Unread 02-19-2013, 07:37 AM   #8
funkness
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I think we are going back and forth on what i am asking lol heres a photo to try to point out what i am asking mind you i tested the vaccum at the crusie control where it has plenty of vaccum then it runs down under the battery box.
20130218_173635.jpg  
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Unread 02-19-2013, 03:54 PM   #9
ZeeJay1997
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I'll keep it simple. The solenoid sucks on that hose you have in your hand. No vaccum lines run arcoss front of vehicle.
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Unread 02-19-2013, 03:59 PM   #10
funkness
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Where does the vacuum hose that goes under the battery box go?
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Unread 02-19-2013, 04:03 PM   #11
ZeeJay1997
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Under the battery box.

Thats the line to the vacuum reservoir... just a box full of vacuum.
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Unread 02-19-2013, 07:53 PM   #12
funkness
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Well i made a diy smoke vacuum tester today and found out that my throttle body gasket is leaking very bad but would that cause a 6-7 inch of pressure drop in my vacuum pressure? Getting new gasket tomorrow
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