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4.9 vacuum system

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Old 11-17-2017, 05:03 PM
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Default 4.9 vacuum system
Looking for help in identifying these part numbers for the vacuum system. One has high pitched whine that developed and the truck has issues with stalling a low speed and skipping. There was a broken vacuum line I repaired, then these modules started acting up, I reckon after 25 years, they went kaput.
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Old 11-17-2017, 05:10 PM
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The check valve and the diverter valve for the smog pump system.

Check rockauto under your year model and engine, then exhaust and emission.
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Old 11-18-2017, 05:53 AM
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You might be able to replace the whole run with a rubber vacuum hose. I got rid of the plastic stuff years ago.
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