so i have my jeep at the 5th mechanic, i have a 2000 jeep cherokee sport. when u start driving after a minute it makes a tea kettle wistle sound...it goes away when you give it gas but appears when you let go. he hooked up to the vacuum and read 19-20 pounds so it doesnt appear to have a leak. jeep told me there is a vacuum tree and one of the hose goes bad. does anyone know where that vacuum tree is? someone else said maybe the intake manifold gasket. thats a 500 dollar fix so if i do that and it doesnt help i will go crazy!! any ideas ? PLEASE PLEASE HELP ME

 

connecting a vacuum gauge to a engine will not tell you if theres a leak,...lol... you wann find it heres they way get a short pc of heater hose or garden hose around three feet works great start the xj take one end stick it to your ear take the other end start moving it around the engine when you hear the noise the loudest see what there be care full around the moving parts....

 

the gauge wont show a leak at all? i thought it would show i difference? does this seem to be a problem with jeeps alot?

 

would it be the manifold gasket? or does it sound more like a vacuum

 

Spray the motor down with starting fluid while it idles, if it changes how it's running at any time you have a vacum leak in the area you were spraying.

 

X2 works like a charm.

 

is there more then just those 3 vaccum lines?

 

A vacum leak can be between the head and the intake, or a cracked hose, there are millions of places for air to leak In not just vacum lines...

 

ive sprayed carb cleaner on the hoses and dont seem to find it changes anything, head gasket? intake manifold gasket? i guess i need to find someone with this problem who has found a fix... it drives me crazy and makes me wanna just get rid of it

 

no one gonna be able to teel you exactly where the noise is coming from t,heres no special whistle spot we all no how to fix you wanna find it you gotta follow the moise untill it gets the loudest

 

driver side sounds most like close to the firewall

 

I use a spray bottle of water. Spray a mist around EVERY possible vacuum leak area. You'll find it eventually, but you have to put in your time. This is something we can't help you a lot with online.

 

what motor 4.0

 

does it come from the heater box area of the dash?

 

yes its the 4..0...and idk where the heater box is...its hard to tell wehre it exactly comes from but im starting to think its an intake manifold gasket...is there any way to check that wtihout spending the 500 to replace it and hope for the best???? this mechanic believes its a vacuum line but i strongly believe its the gasket