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Old 02-26-2009, 11:01 PM   #1
scguru92
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Default cant find vacuum leak

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?
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Old 02-26-2009, 11:06 PM   #2
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try the rear of the engine at the intake gasket. they are known to leak in that area.
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Old 02-26-2009, 11:14 PM   #3
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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.
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Old 02-27-2009, 09:39 AM   #4
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only dam draw back to 4.0's is this dam infamous vaccum leak
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