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cant find vacuum leak


scguru92

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I did the brake cleaner test over all the places I thought of. What are the usual culprits for a vacuum leak on a 4.0?
Thanks
 


smokey

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try the rear of the engine at the intake gasket. they are known to leak in that area.
 

UrbanRedneckKid

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One by one, disconnect and plug different vacuum circuits, See if you find and isolate a bad line or vacuum motor.

Also having a scanner w/ live data really helps here, you can watch the Short Term Fuel Trim, and O2 sensors. Scanners work alot better than listening to your computer controlled idle.
 

Stranger ranger

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only dam draw back to 4.0's is this dam infamous vaccum leak
 

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