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Old 05-14-2014, 07:42 PM   #1
Allisaw
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Default Vacuum leak. Ford 5.0

I need a 5.0 guru. My DD (94 F150) has a massive vacuum leak and i cant for the life of me find it anywhere. It idles rough, but other then that the only indication is the noise. Ive tried the carb clean method but had no luck. Id like to track down a smoke machine, but other then that anyone have an suggestions?
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Old 05-14-2014, 08:53 PM   #2
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Default Re: Vacuum leak. Ford 5.0

Brake booster, heater control hoses, not sure on the trucks but underside of the manifold has a few hoses, if you want I might be able to check it out tomorrow evening. Other than trying to track it down you can look up the vacuum diagram and start eliminating components.
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Old 05-15-2014, 02:54 AM   #3
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Default Re: Vacuum leak. Ford 5.0

Dan Lance has a smoke maker.
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Old 05-15-2014, 06:29 AM   #4
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Default Re: Vacuum leak. Ford 5.0

don't forget to check manifold bolts for torque . one of my biggest leaks was couple intake manifold bolts loosened up .... you can use small propane torch or starter fluid and lightly spray around all ports and and lines listen for a pick up in rpms . also you can pinch off your lines and listen for a change in rpms . simplist of dried old lines can cause it . keep it simple before throwing money at it ... start with ignition then brakes then manifold vacume as engine warms up ....
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Old 05-15-2014, 01:08 PM   #5
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Default Re: Vacuum leak. Ford 5.0

x2 on brake booster
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Old 05-15-2014, 07:55 PM   #6
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Default Re: Vacuum leak. Ford 5.0

thanks guys, i appreciate all the info! its hard to pinpoint the relative location because of how much the sound bounces. But it seems like its coming from behind the motor, but ill check the line and manifold bolts. The truck was stripped down, repainted and rebuilt in 03 so everything is still pretty clean and new.
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Old 05-16-2014, 10:44 AM   #7
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Default Re: Vacuum leak. Ford 5.0

yup, start with plugging the booster, see if it runs better. does it go through any brake fluid? a lot of times if the master cylinder leaked back into the booster, the brake fluid would eat the diaphragm away and bam theres your huge vacuum leak.
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