pmedicmatt
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- Apr 6, 2019
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2010 f350 6.4. I'm having problems with vacuum solenoid. I've rebuilt entire front axle with new axle seals, u-joints, auto-hubs, etc. I also replaced the vacuum solenoid. Now for the problem. The vacuum pump runs continuously even when 4x4 not engaged. If I turn the knob to 4x4, you can hear the solenoid cycle and the hubs will briefly engage. If I plug the line to the vacuum solenoid, the pump will draw vacuum and shut off. Also if I connect line in to vacuum solenoid directly to the line out of solenoid (hub vacuum) the pump will draw vacuum and the hubs will stay engaged. Basically, it seems as though the solenoid is stuck in venting the vacuum even though it's a brand new solenoid. Is there a problem with the solenoid or is there a module that is failing to tell the solenoid what to do??