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Power Strokes
6.4 Tech
ESOF - 4x4 not engaging
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[QUOTE="getstuk, post: 1169218, member: 12375"] Alright, I think it might be my vacuum pump? Here is a video of the noise it's making. I am having a tough time using this vacuum tool to tell if the pump is operating correctly since it doesn't gauge positive pressure. I'm going to try to feel for the pulse by hand...really need another person around to test though... When I turn on the truck the vacuum pump engages for at least a minute, quite loud as you can see. And then it engages again when I engage 4wd, and the pump continues to run for a while. Any ideas on testing this? I can't seem to disconnect the hoses from the pump, I'm worried they're not designed to be disconnected there? Anyone with a diagram? [url=https://www.youtube.com/watch?v=DYL6ZWwo11A]Video link[/url] edit: I just saw the 3 replies posted, so the solenoid on the passenger side huh? I can replace that and then return it if it doesn't work (if they allow me to). But it's still strange the pump is behaving the way it is in the video, still think it's the solenoid? [/QUOTE]
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