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Hissing coming from engine

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Old Oct 24, 2013 | 02:59 PM
  #1  
War Eagle's Avatar
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From: central PA
Year: 2000
Model: Cherokee
Engine: 4.0
Default Hissing coming from engine

Hey guys, my 2000 xj sounds like it is blowing/sucking air. It is very audible, and with the hood popped i think it sounds like its coming from the intake manifold. Are there any vacuum lines around there, or could it be sucking air if the gasket is shot?

I am stumped
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Old Oct 24, 2013 | 03:35 PM
  #2  
CCKen's Avatar
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From: Canton, MI
Year: 1999
Model: Cherokee
Engine: 4.0
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Originally Posted by War Eagle
Hey guys, my 2000 xj sounds like it is blowing/sucking air. It is very audible, and with the hood popped i think it sounds like its coming from the intake manifold. Are there any vacuum lines around there, or could it be sucking air if the gasket is shot?

I am stumped
Are you trolling?

A monkey could look over the vacuum lines and find defects.
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Old Oct 24, 2013 | 03:48 PM
  #3  
RTorrez1's Avatar
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From: Riviera, Texas
Year: 1998 Sport
Model: Cherokee
Engine: 4.0
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Originally Posted by War Eagle
Hey guys, my 2000 xj sounds like it is blowing/sucking air. It is very audible, and with the hood popped i think it sounds like its coming from the intake manifold. Are there any vacuum lines around there, or could it be sucking air if the gasket is shot?

I am stumped
Are you SERIOUS!!!
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Old Oct 24, 2013 | 04:19 PM
  #4  
War Eagle's Avatar
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From: central PA
Year: 2000
Model: Cherokee
Engine: 4.0
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Originally Posted by RTorrez1
Are you SERIOUS!!!
Super serious. I didnt see anything wrong with the vacuum lines, it sounds like an engine sucking air...
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Old Oct 24, 2013 | 04:23 PM
  #5  
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From: Broward County Fl.
Year: 1989 xj sport 2dr
Model: Cherokee
Engine: 12 hole bosch Injectors
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Search vacuum line smoke test.
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Old Oct 25, 2013 | 01:52 AM
  #6  
fearthepaintxj's Avatar
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From: New Hope, VA
Year: 2000
Model: Cherokee
Engine: I6 4.0L OHV
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Do you have any type of intake? Could be some connection leading to air filter, causing air to leak.
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