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20 in hg at idle is good.
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What causes the cruise control on a 1985 Ford E150 van to be slow to engage after setting for a week or less and It will engage after running down the road for an hour or so?
If the cruise control is of the vacuum operated type the problem may be very low manifold vacuum until the engine gets hot. Check for proper manifold vacuum with proper vacuum gauge if the reading is lower than 20-21 at engine idle there is a vacuum leak somewhere, which is also having a negative affect on fuel economy. If no leak if found externally, you may have an engine in need of a valve job.
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You can find a 1993 Ford van vacuum schematics for a 5.0 engine in the car's owner's manual. You can also check with different auto stores.
What is the vacuum hose diagram for a 1999 Ford Expedition 5.4L engine?
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Be sure the vacuum supply line from the engine to the transmission vacuum modulator is not disconnected.
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A vacuum leak on a 1999 Ford Ranger can be located using an automotive stethoscope. It can then be move around the engine to detect the sucking noise of a leak.
