Question about 2003 Ford Expedition
It is either a vaccum leak or a defective PVHS (Vacumm Hub Solenoid). First test the vacuum using a gauge (Lisle 20300) in vacuum lines while heating the lines or spraying the lines with spray lube (Multi-Purpose lube).
After ensuring that there is no leak, go for the solenoid. The solenoid can be tested reading Ohms at its contacts and ensuring that there is continuity.
Vacuum leaks are most common cause for this problem.
See also this forum.
Posted on Jul 22, 2010
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Posted on Jan 02, 2017
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