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| 7.3L IDI (Non-Powerstroke) Diesels Technical discussion of topics related to vehicles powered by the 7.3 Liter In-Direct Injection Navistar engines. |
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09-07-2012, 05:16 PM
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what is a normal vacuum reading
I'm working on a '92 E350 . The brakes almost need 2 feet to get the van to stop. I'm thinking its the vacuum pump. So before I throw a pump in ,I need to know if its a bad pump or a vacuum leak.
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09-16-2012, 05:17 PM
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could be a bad vac pump not putting out enough or it could be the booster leaking internally. my new vac pump pulls a steady 29inhg @idle and all other rpms. drops a bit while braking.
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09-16-2012, 05:25 PM
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17 to 21 inches of hg is the spec from Ford. Which happens to be the same as a good gas motor for intake vacuum.
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